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configuration.py

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+# Copyright 2022 EleutherAI and the HuggingFace Inc. team. All rights reserved.
+#
+# This code is based on EleutherAI's GPT-NeoX library and the GPT-NeoX
+# and OPT implementations in this library. It has been modified from its
+# original forms to accommodate minor architectural differences compared
+# to GPT-NeoX and OPT used by the Meta AI team that trained the model.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# This code has been adapted from Meta and Huggingface and inherits the above lisence.
+# The original code can be found here:
+# https://github.com/huggingface/transformers/blob/main/src/transformers/models/llama/configuration_llama.py
+
+"""Extended Mind LLaMA model configuration"""
+
+from transformers.configuration_utils import PretrainedConfig
+from transformers.utils import logging
+
+logger = logging.get_logger(__name__)
+
+
+class ExtendedLlamaConfig(PretrainedConfig):
+    r"""
+    This is the configuration class to store the configuration of a [`ExtendedLlamaModel`].
+    It is used to instantiate an Extended Mind LLaMA model according to the specified arguments,
+    defining the model architecture. Instantiating a configuration with the
+    defaults will yield a similar configuration to that of the Extended Mind LLaMA-7B.
+
+    Configuration objects inherit from [`PretrainedConfig`]
+    and can be used to control the model outputs. 
+    Read the documentation from [`PretrainedConfig`] for more information.
+
+    Args:
+        vocab_size (`int`, *optional*, defaults to 32000):
+            Vocabulary size of the LLaMA model. Defines the number of different tokens
+            that can be represented by the `inputs_ids` passed when calling [`LlamaModel`]
+        hidden_size (`int`, *optional*, defaults to 4096):
+            Dimension of the hidden representations.
+        intermediate_size (`int`, *optional*, defaults to 11008):
+            Dimension of the MLP representations.
+        num_hidden_layers (`int`, *optional*, defaults to 32):
+            Number of hidden layers in the Transformer encoder.
+        num_attention_heads (`int`, *optional*, defaults to 32):
+            Number of attention heads for each attention layer in the Transformer encoder.
+        num_key_value_heads (`int`, *optional*):
+            This is the number of key_value heads that should be used to implement
+            Grouped Query Attention. If `num_key_value_heads=num_attention_heads`,
+            the model will use Multi Head Attention (MHA), if `num_key_value_heads=1
+            the model will use Multi Query Attention (MQA) otherwise GQA is used. 
+            When converting a multi-head checkpoint to a GQA checkpoint,
+            each group key and value head should be constructed by meanpooling 
+            all the original heads within that group. For more details checkout
+            [this paper](https://arxiv.org/pdf/2305.13245.pdf).
+            If it is not specified, will default to
+            `num_attention_heads`.
+        pretraining_tp (`int`, *optional*, defaults to `1`):
+            Experimental feature. Tensor parallelism rank used during pretraining.
+            Please refer to [this document]
+            (https://huggingface.co/docs/transformers/parallelism)
+            to understand more about it. This value is
+            necessary to ensure exact reproducibility of the pretraining results.
+            Please refer to [this issue]
+            (https://github.com/pytorch/pytorch/issues/76232).
+        hidden_act (`str` or `function`, *optional*, defaults to `"silu"`):
+            The non-linear activation function (function or string) in the decoder.
+        max_position_embeddings (`int`, *optional*, defaults to 2048):
+            The maximum sequence length that this model might ever be used with.
+            Llama 1 supports up to 2048 tokens,
+            Llama 2 up to 4096, CodeLlama up to 16384.
+        initializer_range (`float`, *optional*, defaults to 0.02):
+            The standard deviation of the truncated_normal_initializer 
+            for initializing all weight matrices.
+        rms_norm_eps (`float`, *optional*, defaults to 1e-12):
+            The epsilon used by the rms normalization layers.
+        use_cache (`bool`, *optional*, defaults to `True`):
+            Whether or not the model should return the last key/values attentions 
+            (not used by all models). Only relevant if `config.is_decoder=True`.
+        tie_word_embeddings(`bool`, *optional*, defaults to `False`):
+            Whether to tie weight embeddings
+        rope_theta (`float`, *optional*, defaults to 10000.0):
+            The base period of the RoPE embeddings.
+        rope_scaling (`Dict`, *optional*):
+            Dictionary containing the scaling configuration for the RoPE embeddings.
+            Currently supports two scaling strategies: linear and dynamic. 
+            Their scaling factor must be an float greater than 1. The expected format
+            is `{"type": strategy name, "factor": scaling factor}`.
+            When using this flag, don't update `max_position_embeddings`
+            to the expected new maximum. See the following thread for more information
+            on how these scaling strategies behave:
+            https://www.reddit.com/r/LocalLLaMA/comments/
+            14mrgpr/dynamically_scaled_rope_further_increases/. 
+            This is an experimental feature, subject to breaking API changes in future versions.
+        
+        #### Memory Configuration ####
+        use_external_mind (`bool`, *optional*, defaults to `True`):
+            Whether to attend to external memories.
+        use_external_mind_by_layer (`List[bool]`, *optional*,
+            defaults to List[`True`, ..., `True`]):
+            Whether to attend to external memories, on each decoder layer.
+        topk (`int`, *optional*, defaults to `10`):
+            Number of external memories for each query token to retrieve and attend to.
+        memory_type (`string`, *optional*, defaults to `manual`):
+            Whether to store external memories manually or in a vector database.
+        memory_device (`string`, *optional*, defaults to `cpu`):
+            Specify device to store memory.
+        mask_by_sim (`bool`, *optional*, defaults to `True`):
+            Whether or not to mask retrieved memories by similarity.
+        sim_threshold (`float`, *optional*, defaults to `0.25`):
+            Threshold for masking retrieved memories.
+        tokenizer_all_special_ids (`list`, *optional*, defaults to `[0,1,2]`):
+            Ids for special tokens to remove from memories.
+        remove_special_tokens (`bool`, *optional*, defaults to `True`):
+            Remove memories that correspond to tokenizer special ids.
+        #### Memory Configuration ####
+
+        Example:
+
+    ```python
+    >>> from transformers import LlamaModel, LlamaConfig
+
+    >>> # Initializing a LLaMA llama-7b style configuration
+    >>> configuration = LlamaConfig()
+
+    >>> # Initializing a model from the llama-7b style configuration
+    >>> model = LlamaModel(configuration)
+
+    >>> # Accessing the model configuration
+    >>> configuration = model.config
+    ```"""
+
+    model_type = "extended-llama"
+    keys_to_ignore_at_inference = ["past_key_values"]
+
+    def __init__(
+        self,
+        vocab_size=32000,
+        hidden_size=4096,
+        intermediate_size=11008,
+        num_hidden_layers=32,
+        num_attention_heads=32,
+        num_key_value_heads=None,
+        hidden_act="silu",
+        max_position_embeddings=2048,
+        initializer_range=0.02,
+        rms_norm_eps=1e-5,
+        use_cache=True,
+        pad_token_id=None,
+        bos_token_id=1,
+        eos_token_id=2,
+        pretraining_tp=1,
+        tie_word_embeddings=False,
+        rope_theta=10000.0,
+        rope_scaling=None,
+        memory_config=None,
+        **kwargs,
+    ):
+        if memory_config is None:
+            memory_config = {
+                "mask_by_sim": False,
+                "sim_threshold": 0.25,
+                "topk": 10,
+                "use_external_mind": True,
+                "memory_type": "manual",
+                "memory_device": "cpu",
+                "tokenizer_all_special_ids": [0, bos_token_id, eos_token_id],
+                "use_external_mind_by_layer": [
+                    True for _ in range(num_hidden_layers)
+                ],
+                "remove_special_ids": True,
+            }
+        for key, value in memory_config.items():
+            setattr(self, key, value)
+
+        self.vocab_size = vocab_size
+        self.max_position_embeddings = max_position_embeddings
+        self.hidden_size = hidden_size
+        self.intermediate_size = intermediate_size
+        self.num_hidden_layers = num_hidden_layers
+        self.num_attention_heads = num_attention_heads
+
+        # for backward compatibility
+        if num_key_value_heads is None:
+            num_key_value_heads = num_attention_heads
+
+        self.num_key_value_heads = num_key_value_heads
+        self.hidden_act = hidden_act
+        self.initializer_range = initializer_range
+        self.rms_norm_eps = rms_norm_eps
+        self.pretraining_tp = pretraining_tp
+        self.use_cache = use_cache
+        self.rope_theta = rope_theta
+        self.rope_scaling = rope_scaling
+        self._rope_scaling_validation()
+
+        super().__init__(
+            pad_token_id=pad_token_id,
+            bos_token_id=bos_token_id,
+            eos_token_id=eos_token_id,
+            tie_word_embeddings=tie_word_embeddings,
+            **kwargs,
+        )
+
+    def _rope_scaling_validation(self):
+        """
+        Validate the `rope_scaling` configuration.
+        """
+        if self.rope_scaling is None:
+            return
+
+        if not isinstance(self.rope_scaling, dict) or len(self.rope_scaling) != 2:
+            raise ValueError(
+                "`rope_scaling` must be a dictionary with with two fields, `type` and `factor`, "
+                f"got {self.rope_scaling}"
+            )
+        rope_scaling_type = self.rope_scaling.get("type", None)
+        rope_scaling_factor = self.rope_scaling.get("factor", None)
+        if rope_scaling_type is None or rope_scaling_type not in ["linear", "dynamic"]:
+            raise ValueError(
+                f"""`rope_scaling`'s type field must be one of ['linear', 'dynamic'],
+                got {rope_scaling_type}"""
+            )
+        if (
+            rope_scaling_factor is None
+            or not isinstance(rope_scaling_factor, float)
+            or rope_scaling_factor <= 1.0
+        ):
+            raise ValueError(
+                f"""`rope_scaling`'s factor field must be an float > 1,
+                got {rope_scaling_factor}"""
+            )
+        
+        # Faiss memory not compatible with Grouped Query Attention
+        if self.memory_type=='faiss' and self.num_key_value_heads != self.num_attention_heads:
+            raise NotImplementedError(
+                'Faiss memory not compatible with Grouped Query Attention.'
+            )
+

modeling.py

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+# Copyright 2022 EleutherAI and the HuggingFace Inc. team. All rights reserved.
+#
+# This code is based on EleutherAI's GPT-NeoX library and the GPT-NeoX
+# and OPT implementations in this library. It has been modified from its
+# original forms to accommodate minor architectural differences compared
+# to GPT-NeoX and OPT used by the Meta AI team that trained the model.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# This code has been adapted from Meta and Huggingface and inherits the above lisence.
+# The original code can be found here:
+# https://github.com/huggingface/transformers/blob/main/src/transformers/models/llama/modeling_llama.py
+# We annotate the edited code below with 'EM' comments to indicate where we have made changes.
+"""PyTorch Extended LLaMA model."""
+import math
+from typing import List, Optional, Tuple, Union
+
+import faiss
+import numpy as np
+import torch
+import torch.nn.functional as F
+import torch.utils.checkpoint
+from einops import rearrange
+from torch import nn
+from torch.linalg import vector_norm
+from torch.nn import CrossEntropyLoss
+from transformers.activations import ACT2FN
+from transformers.modeling_outputs import (
+    BaseModelOutputWithPast,
+    CausalLMOutputWithPast,
+)
+from transformers.modeling_utils import PreTrainedModel
+from transformers.utils import (
+    add_start_docstrings,
+    add_start_docstrings_to_model_forward,
+    logging,
+    replace_return_docstrings,
+)
+
+from .configuration import ExtendedLlamaConfig
+
+logger = logging.get_logger(__name__)
+
+_CONFIG_FOR_DOC = "ExtendedLlamaConfig"
+
+
+# Copied from transformers.models.bart.modeling_bart._make_causal_mask
+def _make_causal_mask(
+    input_ids_shape: torch.Size,
+    dtype: torch.dtype,
+    device: torch.device,
+    past_key_values_length: int = 0,
+):
+    """
+    Make causal mask used for bi-directional self-attention.
+    """
+    bsz, tgt_len = input_ids_shape
+    mask = torch.full((tgt_len, tgt_len), torch.finfo(dtype).min, device=device)
+    mask_cond = torch.arange(mask.size(-1), device=device)
+    mask.masked_fill_(mask_cond < (mask_cond + 1).view(mask.size(-1), 1), 0)
+    mask = mask.to(dtype)
+
+    if past_key_values_length > 0:
+        mask = torch.cat(
+            [
+                torch.zeros(
+                    tgt_len, past_key_values_length, dtype=dtype, device=device
+                ),
+                mask,
+            ],
+            dim=-1,
+        )
+    return mask[None, None, :, :].expand(
+        bsz, 1, tgt_len, tgt_len + past_key_values_length
+    )
+
+
+# Copied from transformers.models.bart.modeling_bart._expand_mask
+def _expand_mask(mask: torch.Tensor, dtype: torch.dtype, tgt_len: Optional[int] = None):
+    """
+    Expands attention_mask from `[bsz, seq_len]` to `[bsz, 1, tgt_seq_len, src_seq_len]`.
+    """
+    bsz, src_len = mask.size()
+    tgt_len = tgt_len if tgt_len is not None else src_len
+
+    expanded_mask = mask[:, None, None, :].expand(bsz, 1, tgt_len, src_len).to(dtype)
+
+    inverted_mask = 1.0 - expanded_mask
+
+    return inverted_mask.masked_fill(
+        inverted_mask.to(torch.bool), torch.finfo(dtype).min
+    )
+
+
+class LlamaRMSNorm(nn.Module):
+    """LlamaRMSNorm is equivalent to T5LayerNorm"""
+
+    def __init__(self, hidden_size, eps=1e-6):
+        """
+        LlamaRMSNorm is equivalent to T5LayerNorm
+        """
+        super().__init__()
+        self.weight = nn.Parameter(torch.ones(hidden_size))
+        self.variance_epsilon = eps
+
+    def forward(self, hidden_states):
+        """Apply RMS Norm"""
+        input_dtype = hidden_states.dtype
+        hidden_states = hidden_states.to(torch.float32)
+        variance = hidden_states.pow(2).mean(-1, keepdim=True)
+        hidden_states = hidden_states * torch.rsqrt(variance + self.variance_epsilon)
+        return self.weight * hidden_states.to(input_dtype)
+
+
+class LlamaRotaryEmbedding(torch.nn.Module):
+    """Rotary Positional Embedding"""
+
+    def __init__(self, dim, max_position_embeddings=2048, base=10000, device=None):
+        super().__init__()
+        self.dim = dim
+        self.max_position_embeddings = max_position_embeddings
+        self.base = base
+        inv_freq = 1.0 / (
+            self.base ** (torch.arange(0, self.dim, 2).float().to(device) / self.dim)
+        )
+        self.register_buffer("inv_freq", inv_freq, persistent=False)
+
+        # Build here to make `torch.jit.trace` work.
+        self._set_cos_sin_cache(
+            seq_len=max_position_embeddings,
+            device=self.inv_freq.device,
+            dtype=torch.get_default_dtype(),
+        )
+
+    def _set_cos_sin_cache(self, seq_len, device, dtype):
+        self.max_seq_len_cached = seq_len
+        t = torch.arange(
+            self.max_seq_len_cached, device=device, dtype=self.inv_freq.dtype
+        )
+
+        freqs = torch.einsum("i,j->ij", t, self.inv_freq)
+        # Different from paper, but it uses a different permutation in order to obtain the same calculation
+        emb = torch.cat((freqs, freqs), dim=-1)
+        self.register_buffer(
+            "cos_cached", emb.cos()[None, None, :, :].to(dtype), persistent=False
+        )
+        self.register_buffer(
+            "sin_cached", emb.sin()[None, None, :, :].to(dtype), persistent=False
+        )
+
+    def forward(self, x, seq_len=None):
+        # x: [bs, num_attention_heads, seq_len, head_size]
+        if seq_len > self.max_seq_len_cached:
+            self._set_cos_sin_cache(seq_len=seq_len, device=x.device, dtype=x.dtype)
+
+        return (
+            self.cos_cached[:, :, :seq_len, ...].to(dtype=x.dtype),
+            self.sin_cached[:, :, :seq_len, ...].to(dtype=x.dtype),
+        )
+
+
+class LlamaLinearScalingRotaryEmbedding(LlamaRotaryEmbedding):
+    """LlamaRotaryEmbedding extended with linear scaling. Credits to the Reddit user /u/kaiokendev"""
+
+    def __init__(
+        self,
+        dim,
+        max_position_embeddings=2048,
+        base=10000,
+        device=None,
+        scaling_factor=1.0,
+    ):
+        self.scaling_factor = scaling_factor
+        super().__init__(dim, max_position_embeddings, base, device)
+
+    def _set_cos_sin_cache(self, seq_len, device, dtype):
+        self.max_seq_len_cached = seq_len
+        t = torch.arange(
+            self.max_seq_len_cached, device=device, dtype=self.inv_freq.dtype
+        )
+        t = t / self.scaling_factor
+
+        freqs = torch.einsum("i,j->ij", t, self.inv_freq)
+        # Different from paper, but it uses a different permutation in order to obtain the same calculation
+        emb = torch.cat((freqs, freqs), dim=-1)
+        self.register_buffer(
+            "cos_cached", emb.cos()[None, None, :, :].to(dtype), persistent=False
+        )
+        self.register_buffer(
+            "sin_cached", emb.sin()[None, None, :, :].to(dtype), persistent=False
+        )
+
+
+class LlamaDynamicNTKScalingRotaryEmbedding(LlamaRotaryEmbedding):
+    """LlamaRotaryEmbedding extended with Dynamic NTK scaling. Credits to the Reddit users /u/bloc97 and /u/emozilla"""
+
+    def __init__(
+        self,
+        dim,
+        max_position_embeddings=2048,
+        base=10000,
+        device=None,
+        scaling_factor=1.0,
+    ):
+        self.scaling_factor = scaling_factor
+        super().__init__(dim, max_position_embeddings, base, device)
+
+    def _set_cos_sin_cache(self, seq_len, device, dtype):
+        self.max_seq_len_cached = seq_len
+
+        if seq_len > self.max_position_embeddings:
+            base = self.base * (
+                (self.scaling_factor * seq_len / self.max_position_embeddings)
+                - (self.scaling_factor - 1)
+            ) ** (self.dim / (self.dim - 2))
+            inv_freq = 1.0 / (
+                base ** (torch.arange(0, self.dim, 2).float().to(device) / self.dim)
+            )
+            self.register_buffer("inv_freq", inv_freq, persistent=False)
+
+        t = torch.arange(
+            self.max_seq_len_cached, device=device, dtype=self.inv_freq.dtype
+        )
+
+        freqs = torch.einsum("i,j->ij", t, self.inv_freq)
+        # Different from paper, but it uses a different permutation in order to obtain the same calculation
+        emb = torch.cat((freqs, freqs), dim=-1)
+        self.register_buffer(
+            "cos_cached", emb.cos()[None, None, :, :].to(dtype), persistent=False
+        )
+        self.register_buffer(
+            "sin_cached", emb.sin()[None, None, :, :].to(dtype), persistent=False
+        )
+
+
+def rotate_half(x):
+    """Rotates half the hidden dims of the input."""
+    x1 = x[..., : x.shape[-1] // 2]
+    x2 = x[..., x.shape[-1] // 2 :]
+    return torch.cat((-x2, x1), dim=-1)
+
+
+def apply_rotary_pos_emb(q, k, cos, sin, position_ids):
+    """Apply rotary positional embedding to q and k."""
+    # The first two dimensions of cos and sin are always 1, so we can `squeeze` them.
+    cos = cos.squeeze(1).squeeze(0)  # [seq_len, dim]
+    sin = sin.squeeze(1).squeeze(0)  # [seq_len, dim]
+
+    s_q = q.size(
+        -2
+    )  
+    # EM: Since we apply rotary pos emb after reading from cache, queries may be shorter
+    _q_position_ids = position_ids[:, -s_q:]
+    _q_cos = cos[_q_position_ids].unsqueeze(1)
+    _q_sin = sin[_q_position_ids].unsqueeze(1)
+    q_embed = (q * _q_cos) + (rotate_half(q) * _q_sin)
+
+    cos = cos[position_ids].unsqueeze(1)  # [bs, 1, seq_len, dim]
+    sin = sin[position_ids].unsqueeze(1)  # [bs, 1, seq_len, dim]
+    k_embed = (k * cos) + (rotate_half(k) * sin)
+    return q_embed, k_embed
+
+
+class LlamaMLP(nn.Module):
+    """MLP Module"""
+
+    def __init__(self, config):
+        super().__init__()
+        self.config = config
+        self.hidden_size = config.hidden_size
+        self.intermediate_size = config.intermediate_size
+        self.gate_proj = nn.Linear(self.hidden_size, self.intermediate_size, bias=False)
+        self.up_proj = nn.Linear(self.hidden_size, self.intermediate_size, bias=False)
+        self.down_proj = nn.Linear(self.intermediate_size, self.hidden_size, bias=False)
+        self.act_fn = ACT2FN[config.hidden_act]
+
+    def forward(self, x):
+        if self.config.pretraining_tp > 1:
+            slice = self.intermediate_size // self.config.pretraining_tp
+            gate_proj_slices = self.gate_proj.weight.split(slice, dim=0)
+            up_proj_slices = self.up_proj.weight.split(slice, dim=0)
+            down_proj_slices = self.down_proj.weight.split(slice, dim=1)
+
+            gate_proj = torch.cat(
+                [
+                    F.linear(x, gate_proj_slices[i])
+                    for i in range(self.config.pretraining_tp)
+                ],
+                dim=-1,
+            )
+            up_proj = torch.cat(
+                [
+                    F.linear(x, up_proj_slices[i])
+                    for i in range(self.config.pretraining_tp)
+                ],
+                dim=-1,
+            )
+
+            intermediate_states = (self.act_fn(gate_proj) * up_proj).split(slice, dim=2)
+            down_proj = [
+                F.linear(intermediate_states[i], down_proj_slices[i])
+                for i in range(self.config.pretraining_tp)
+            ]
+            down_proj = sum(down_proj)
+        else:
+            down_proj = self.down_proj(self.act_fn(self.gate_proj(x)) * self.up_proj(x))
+
+        return down_proj
+
+
+def repeat_kv(hidden_states: torch.Tensor, n_rep: int) -> torch.Tensor:
+    """
+    This is the equivalent of torch.repeat_interleave(x, dim=1, repeats=n_rep). The hidden states go from (batch,
+    num_key_value_heads, seqlen, head_dim) to (batch, num_attention_heads, seqlen, head_dim)
+    """
+    batch, num_key_value_heads, slen, head_dim = hidden_states.shape
+    if n_rep == 1:
+        return hidden_states
+    hidden_states = hidden_states[:, :, None, :, :].expand(
+        batch, num_key_value_heads, n_rep, slen, head_dim
+    )
+    return hidden_states.reshape(batch, num_key_value_heads * n_rep, slen, head_dim)
+
+
+class ExtendedLlamaAttention(nn.Module):
+    """Multi-headed attention from 'Attention Is All You Need' paper"""
+
+    def __init__(self, config: ExtendedLlamaConfig):
+        super().__init__()
+        self.config = config
+        self.hidden_size = config.hidden_size
+        self.num_heads = config.num_attention_heads
+        self.head_dim = self.hidden_size // self.num_heads
+        self.num_key_value_heads = config.num_key_value_heads
+        self.num_key_value_groups = self.num_heads // self.num_key_value_heads
+        self.max_position_embeddings = config.max_position_embeddings
+        self.rope_theta = config.rope_theta
+
+        if (self.head_dim * self.num_heads) != self.hidden_size:
+            raise ValueError(
+                f"hidden_size must be divisible by num_heads (got `hidden_size`: {self.hidden_size}"
+                f" and `num_heads`: {self.num_heads})."
+            )
+        self.q_proj = nn.Linear(
+            self.hidden_size, self.num_heads * self.head_dim, bias=False
+        )
+        self.k_proj = nn.Linear(
+            self.hidden_size, self.num_key_value_heads * self.head_dim, bias=False
+        )
+        self.v_proj = nn.Linear(
+            self.hidden_size, self.num_key_value_heads * self.head_dim, bias=False
+        )
+        self.o_proj = nn.Linear(
+            self.num_heads * self.head_dim, self.hidden_size, bias=False
+        )
+        self._init_rope()
+
+    def _init_rope(self):
+        if self.config.rope_scaling is None:
+            self.rotary_emb = LlamaRotaryEmbedding(
+                self.head_dim,
+                max_position_embeddings=self.max_position_embeddings,
+                base=self.rope_theta,
+            )
+        else:
+            scaling_type = self.config.rope_scaling["type"]
+            scaling_factor = self.config.rope_scaling["factor"]
+            if scaling_type == "linear":
+                self.rotary_emb = LlamaLinearScalingRotaryEmbedding(
+                    self.head_dim,
+                    max_position_embeddings=self.max_position_embeddings,
+                    scaling_factor=scaling_factor,
+                    base=self.rope_theta,
+                )
+            elif scaling_type == "dynamic":
+                self.rotary_emb = LlamaDynamicNTKScalingRotaryEmbedding(
+                    self.head_dim,
+                    max_position_embeddings=self.max_position_embeddings,
+                    scaling_factor=scaling_factor,
+                    base=self.rope_theta,
+                )
+            else:
+                raise ValueError(f"Unknown RoPE scaling type {scaling_type}")
+
+    def _shape(self, tensor: torch.Tensor, seq_len: int, bsz: int):
+        return (
+            tensor.view(bsz, seq_len, self.num_heads, self.head_dim)
+            .transpose(1, 2)
+            .contiguous()
+        )
+
+    def forward(
+        self,
+        hidden_states: torch.Tensor,
+        attention_mask: Optional[torch.Tensor] = None,
+        position_ids: Optional[torch.LongTensor] = None,
+        past_key_value: Optional[Tuple[torch.Tensor]] = None,
+        output_attentions: bool = False,
+        output_retrieved_memory_idx: bool = False,
+        use_cache: bool = False,
+        long_range_past_key_value=None,
+        faiss_indexes=None,
+        mask_by_sim=False,
+        sim_threshold=0.0,
+        topk=None,
+        current_layer=None,
+    ) -> Tuple[torch.Tensor, Optional[torch.Tensor], Optional[Tuple[torch.Tensor]]]:
+        """forward"""
+        bsz, q_len, _ = hidden_states.size()
+
+        if self.config.pretraining_tp > 1:
+            key_value_slicing = (
+                self.num_key_value_heads * self.head_dim
+            ) // self.config.pretraining_tp
+            query_slices = self.q_proj.weight.split(
+                (self.num_heads * self.head_dim) // self.config.pretraining_tp, dim=0
+            )
+            key_slices = self.k_proj.weight.split(key_value_slicing, dim=0)
+            value_slices = self.v_proj.weight.split(key_value_slicing, dim=0)
+
+            query_states = [
+                F.linear(hidden_states, query_slices[i])
+                for i in range(self.config.pretraining_tp)
+            ]
+            query_states = torch.cat(query_states, dim=-1)
+
+            key_states = [
+                F.linear(hidden_states, key_slices[i])
+                for i in range(self.config.pretraining_tp)
+            ]
+            key_states = torch.cat(key_states, dim=-1)
+
+            value_states = [
+                F.linear(hidden_states, value_slices[i])
+                for i in range(self.config.pretraining_tp)
+            ]
+            value_states = torch.cat(value_states, dim=-1)
+
+        else:
+            query_states = self.q_proj(hidden_states)
+            key_states = self.k_proj(hidden_states)
+            value_states = self.v_proj(hidden_states)
+
+        query_states = query_states.view(
+            bsz, q_len, self.num_heads, self.head_dim
+        ).transpose(1, 2)
+        key_states = key_states.view(
+            bsz, q_len, self.num_key_value_heads, self.head_dim
+        ).transpose(1, 2)
+        value_states = value_states.view(
+            bsz, q_len, self.num_key_value_heads, self.head_dim
+        ).transpose(1, 2)
+
+        # EM: Read from cache before position information is added
+        if past_key_value is not None:
+            # reuse k, v, self_attention
+            key_states = torch.cat([past_key_value[0], key_states], dim=2)
+            value_states = torch.cat([past_key_value[1], value_states], dim=2)
+
+        past_key_value = (key_states, value_states) if use_cache else None
+
+        kv_seq_len = key_states.shape[-2]
+        cos, sin = self.rotary_emb(value_states, seq_len=kv_seq_len)
+
+        query_states, key_states = apply_rotary_pos_emb(
+            query_states, key_states, cos, sin, position_ids
+        )
+
+        # repeat k/v heads if n_kv_heads < n_heads
+        key_states = repeat_kv(key_states, self.num_key_value_groups)
+        value_states = repeat_kv(value_states, self.num_key_value_groups)
+        bsz, nh, s_q, hd = query_states.shape
+
+        attn_weights = torch.matmul(
+            query_states, key_states.transpose(2, 3)
+        ) / math.sqrt(self.head_dim)
+
+        if attn_weights.size() != (bsz, self.num_heads, q_len, kv_seq_len):
+            raise ValueError(
+                f"Attention weights should be of size {(bsz, self.num_heads, q_len, kv_seq_len)}, but is"
+                f" {attn_weights.size()}"
+            )
+
+        # EM: Retrieve memories from cache or faiss indexes
+        if long_range_past_key_value is not None or faiss_indexes is not None:
+            if long_range_past_key_value is not None:  # manual memories
+                k_cache, v_cache = long_range_past_key_value
+                k_cache = repeat_kv(k_cache, self.num_key_value_groups)
+                v_cache = repeat_kv(v_cache, self.num_key_value_groups)
+
+                s_cache = k_cache.size(-2)
+
+                k_cache = k_cache.to(key_states.device)
+                v_cache = v_cache.to(key_states.device)
+
+                # Normalize query and key vectors
+                q_n = query_states / vector_norm(
+                    query_states, ord=2, dim=-1, keepdim=True
+                )
+                k_n = k_cache / vector_norm(k_cache, ord=2, dim=-1, keepdim=True)
+
+                sim = q_n.matmul(k_n.transpose(2, 3))
+                if s_cache < topk:
+                    topk = s_cache  # number of tokens in cache < topk
+                val, idx = torch.topk(sim, k=topk, dim=-1) # Retrieve topk memories
+
+                reshaped_idx = idx.reshape(bsz, nh, s_q * topk)
+
+                selected_k = k_cache.gather(
+                    dim=-2, index=reshaped_idx.unsqueeze(-1).expand(-1, -1, -1, hd)
+                )
+                selected_v = v_cache.gather(
+                    dim=-2, index=reshaped_idx.unsqueeze(-1).expand(-1, -1, -1, hd)
+                )
+
+            elif faiss_indexes is not None:  # FAISS indexes
+                kn_index, kv_index = faiss_indexes
+                q_n = query_states / vector_norm(
+                    query_states, ord=2, dim=-1, keepdim=True
+                )
+
+                # One-hot encoding for layer, head to only retrieve memories from the same layer, head
+                one_hot_encodings = (
+                    F.one_hot(
+                        torch.arange(
+                            0,
+                            nh * self.config.num_hidden_layers,
+                            device=query_states.device,
+                        )
+                    )
+                    * 10
+                )
+                q_n = torch.concat(
+                    [
+                        rearrange(q_n, "b h s d -> b (h s) d", h=nh),
+                        one_hot_encodings[nh * current_layer : nh * (current_layer + 1)]
+                        .unsqueeze(0)
+                        .repeat_interleave(repeats=query_states.size(-2), dim=-2),
+                    ],
+                    dim=-1,
+                ).squeeze()
+
+                if kn_index.ntotal / (nh * self.config.num_hidden_layers) < topk:
+                    topk = kn_index.ntotal / (nh * self.config.num_hidden_layers)
+
+                val, idx = kn_index.search(q_n.to("cpu").detach().numpy(), k=topk)
+                val = torch.tensor(val - 100).reshape(bsz, nh, s_q, topk) #Similarity includes scale factor from one-hot encoding
+                reshaped_idx = torch.tensor(
+                    idx % (kn_index.ntotal / (nh * self.config.num_hidden_layers))
+                ).reshape(bsz, nh, s_q * topk)
+
+                selected_k = rearrange(
+                    torch.tensor(kv_index.reconstruct_batch(idx.flatten()))[:, :hd],
+                    "(h s) d -> 1 h s d",
+                    h=nh,
+                ).to(query_states.device)
+
+                selected_v = rearrange(
+                    torch.tensor(kv_index.reconstruct_batch(idx.flatten()))[:, hd:],
+                    "(h s) d -> 1 h s d",
+                    h=nh,
+                ).to(query_states.device)
+
+            attn_weight_cache = torch.matmul(
+                query_states, selected_k.transpose(2, 3)
+            ) / math.sqrt(self.head_dim)
+            # EM: Mask by similarity
+            if mask_by_sim:
+                sim_mask = (
+                    rearrange(~(val > sim_threshold).bool(), "b h s i -> b h (s i)")
+                    .unsqueeze(-2)
+                    .expand(-1, -1, s_q, -1)
+                ).to(query_states.device)
+                attn_weight_cache = attn_weight_cache.masked_fill(
+                    sim_mask, torch.finfo(query_states.dtype).min
+                )
+            # EM: Concatenate cache and current attention weights, values
+            attn_weights = torch.cat([attn_weight_cache, attn_weights], dim=-1)
+            value_states = torch.cat([selected_v, value_states], dim=-2)
+
+        min_val = torch.finfo(attn_weights.dtype).min
+        
+        # EM: Create mask for external memories, queries only attend to their own memories
+        def _create_external_memories_mask(k, s_q, device, min_val=min_val):
+            mask = torch.ones(s_q, s_q * k, device=device, dtype=torch.float32)
+            for i in range(s_q):
+                mask[i, i * k : (i + 1) * k] = 0
+
+            filled = mask.masked_fill(mask.bool(), min_val)
+            return filled
+
+        if attention_mask is not None:
+            if attention_mask.size() != (bsz, 1, q_len, kv_seq_len):
+                raise ValueError(
+                    f"Attention mask should be of size {(bsz, 1, q_len, kv_seq_len)}, but is {attention_mask.size()}"
+                )
+            # EM: Concatenate attention mask with external memories mask
+            if long_range_past_key_value is not None or faiss_indexes is not None:
+                memory_mask = _create_external_memories_mask(
+                    k=topk, s_q=s_q, device=attn_weights.device
+                )
+                attention_mask = (
+                    torch.cat(
+                        [
+                            memory_mask,
+                            attention_mask.squeeze(dim=[0, 1]),
+                        ],
+                        dim=1,
+                    )
+                    .unsqueeze(dim=0)
+                    .unsqueeze(dim=1)
+                )
+            attn_weights = attn_weights + attention_mask
+
+        # upcast attention to fp32
+        attn_weights = nn.functional.softmax(
+            attn_weights, dim=-1, dtype=torch.float32
+        ).to(query_states.dtype)
+        attn_output = torch.matmul(attn_weights, value_states)
+
+        if attn_output.size() != (bsz, self.num_heads, q_len, self.head_dim):
+            raise ValueError(
+                f"`attn_output` should be of size {(bsz, self.num_heads, q_len, self.head_dim)}, but is"
+                f" {attn_output.size()}"
+            )
+
+        attn_output = attn_output.transpose(1, 2).contiguous()
+        attn_output = attn_output.reshape(bsz, q_len, self.hidden_size)
+
+        if self.config.pretraining_tp > 1:
+            attn_output = attn_output.split(
+                self.hidden_size // self.config.pretraining_tp, dim=2
+            )
+            o_proj_slices = self.o_proj.weight.split(
+                self.hidden_size // self.config.pretraining_tp, dim=1
+            )
+            attn_output = sum(
+                F.linear(attn_output[i], o_proj_slices[i])
+                for i in range(self.config.pretraining_tp)
+            )
+        else:
+            attn_output = self.o_proj(attn_output)
+
+        if not output_attentions:
+            attn_weights = None
+
+        if not output_retrieved_memory_idx:
+            reshaped_idx = None
+        return attn_output, attn_weights, past_key_value, reshaped_idx
+
+
+class ExtendedLlamaDecoderLayer(nn.Module):
+    """Decoder Layer for LLaMA"""
+
+    def __init__(self, config: ExtendedLlamaConfig):
+        super().__init__()
+        self.hidden_size = config.hidden_size
+        self.self_attn = ExtendedLlamaAttention(config=config)
+        self.mlp = LlamaMLP(config)
+        self.input_layernorm = LlamaRMSNorm(config.hidden_size, eps=config.rms_norm_eps)
+        self.post_attention_layernorm = LlamaRMSNorm(
+            config.hidden_size, eps=config.rms_norm_eps
+        )
+
+    def forward(
+        self,
+        hidden_states: torch.Tensor,
+        attention_mask: Optional[torch.Tensor] = None,
+        position_ids: Optional[torch.LongTensor] = None,
+        past_key_value: Optional[Tuple[torch.Tensor]] = None,
+        output_attentions: Optional[bool] = False,
+        output_retrieved_memory_idx: Optional[bool] = False,
+        use_cache: Optional[bool] = False,
+        long_range_past_key_value: Optional[Tuple[torch.Tensor]] = None,
+        faiss_indexes: Tuple = None,
+        mask_by_sim: bool = False,
+        sim_threshold: float = None,
+        topk: int = None,
+        current_layer=None,
+    ) -> Tuple[
+        torch.FloatTensor, Optional[Tuple[torch.FloatTensor, torch.FloatTensor]]
+    ]:
+        """
+        Args:
+            hidden_states (`torch.FloatTensor`): input to the layer of shape `(batch, seq_len, embed_dim)`
+            attention_mask (`torch.FloatTensor`, *optional*): attention mask of size
+                `(batch, 1, tgt_len, src_len)` where padding elements are indicated by very large negative values.
+            output_attentions (`bool`, *optional*):
+                Whether or not to return the attentions tensors of all attention layers. See `attentions` under
+                returned tensors for more detail.
+            use_cache (`bool`, *optional*):
+                If set to `True`, `past_key_values` key value states are returned and can be used to speed up decoding
+                (see `past_key_values`).
+            past_key_value (`Tuple(torch.FloatTensor)`, *optional*): cached past key and value projection states
+        """
+
+        residual = hidden_states
+
+        hidden_states = self.input_layernorm(hidden_states)
+
+        # Self Attention
+        (
+            hidden_states,
+            self_attn_weights,
+            present_key_value,
+            selected_idx,
+        ) = self.self_attn(
+            hidden_states=hidden_states,
+            attention_mask=attention_mask,
+            position_ids=position_ids,
+            past_key_value=past_key_value,
+            output_attentions=output_attentions,
+            output_retrieved_memory_idx=output_retrieved_memory_idx,
+            use_cache=use_cache,
+            long_range_past_key_value=long_range_past_key_value,
+            faiss_indexes=faiss_indexes,
+            mask_by_sim=mask_by_sim,
+            sim_threshold=sim_threshold,
+            topk=topk,
+            current_layer=current_layer,
+        )
+        hidden_states = residual + hidden_states
+
+        # Fully Connected
+        residual = hidden_states
+        hidden_states = self.post_attention_layernorm(hidden_states)
+        hidden_states = self.mlp(hidden_states)
+        hidden_states = residual + hidden_states
+
+        outputs = (hidden_states,)
+
+        if output_attentions:
+            outputs += (self_attn_weights,)
+
+        if use_cache:
+            outputs += (present_key_value,)
+
+        if output_retrieved_memory_idx:
+            outputs += (selected_idx,)
+
+        return outputs
+
+
+LLAMA_START_DOCSTRING = r"""
+    This model inherits from [`PreTrainedModel`]. Check the superclass documentation for the generic methods the
+    library implements for all its model (such as downloading or saving, resizing the input embeddings, pruning heads
+    etc.)
+
+    This model is also a PyTorch [torch.nn.Module](https://pytorch.org/docs/stable/nn.html#torch.nn.Module) subclass.
+    Use it as a regular PyTorch Module and refer to the PyTorch documentation for all matter related to general usage
+    and behavior.
+
+    Parameters:
+        config ([`ExtendedLlamaConfig`]):
+            Model configuration class with all the parameters of the model. Initializing with a config file does not
+            load the weights associated with the model, only the configuration. Check out the
+            [`~PreTrainedModel.from_pretrained`] method to load the model weights.
+"""
+
+
+@add_start_docstrings(
+    "The bare LLaMA Model outputting raw hidden-states without any specific head on top.",
+    LLAMA_START_DOCSTRING,
+)
+class LlamaPreTrainedModel(PreTrainedModel):
+    """Wrapper class"""
+
+    config_class = ExtendedLlamaConfig
+    base_model_prefix = "model"
+    supports_gradient_checkpointing = True
+    _no_split_modules = ["LlamaDecoderLayer"]
+    _skip_keys_device_placement = "past_key_values"
+
+    def _init_weights(self, module):
+        std = self.config.initializer_range
+        if isinstance(module, nn.Linear):
+            module.weight.data.normal_(mean=0.0, std=std)
+            if module.bias is not None:
+                module.bias.data.zero_()
+        elif isinstance(module, nn.Embedding):
+            module.weight.data.normal_(mean=0.0, std=std)
+            if module.padding_idx is not None:
+                module.weight.data[module.padding_idx].zero_()
+
+    def _set_gradient_checkpointing(self, module, value=False):
+        if isinstance(module, ExtendedLlamaModel):
+            module.gradient_checkpointing = value
+
+
+LLAMA_INPUTS_DOCSTRING = r"""
+    Args:
+        input_ids (`torch.LongTensor` of shape `(batch_size, sequence_length)`):
+            Indices of input sequence tokens in the vocabulary. Padding will be ignored by default should you provide
+            it.
+
+            Indices can be obtained using [`AutoTokenizer`]. See [`PreTrainedTokenizer.encode`] and
+            [`PreTrainedTokenizer.__call__`] for details.
+
+            [What are input IDs?](../glossary#input-ids)
+        attention_mask (`torch.Tensor` of shape `(batch_size, sequence_length)`, *optional*):
+            Mask to avoid performing attention on padding token indices. Mask values selected in `[0, 1]`:
+
+            - 1 for tokens that are **not masked**,
+            - 0 for tokens that are **masked**.
+
+            [What are attention masks?](../glossary#attention-mask)
+
+            Indices can be obtained using [`AutoTokenizer`]. See [`PreTrainedTokenizer.encode`] and
+            [`PreTrainedTokenizer.__call__`] for details.
+
+            If `past_key_values` is used, optionally only the last `decoder_input_ids` have to be input (see
+            `past_key_values`).
+
+            If you want to change padding behavior, you should read [`modeling_opt._prepare_decoder_attention_mask`]
+            and modify to your needs. See diagram 1 in [the paper](https://arxiv.org/abs/1910.13461) for more
+            information on the default strategy.
+
+            - 1 indicates the head is **not masked**,
+            - 0 indicates the head is **masked**.
+        position_ids (`torch.LongTensor` of shape `(batch_size, sequence_length)`, *optional*):
+            Indices of positions of each input sequence tokens in the position embeddings. Selected in the range `[0,
+            config.n_positions - 1]`.
+
+            [What are position IDs?](../glossary#position-ids)
+        past_key_values (`tuple(tuple(torch.FloatTensor))`, *optional*, returned when `use_cache=True` is passed or when `config.use_cache=True`):
+            Tuple of `tuple(torch.FloatTensor)` of length `config.n_layers`, with each tuple having 2 tensors of shape
+            `(batch_size, num_heads, sequence_length, embed_size_per_head)`) and 2 additional tensors of shape
+            `(batch_size, num_heads, encoder_sequence_length, embed_size_per_head)`.
+
+            Contains pre-computed hidden-states (key and values in the self-attention blocks and in the cross-attention
+            blocks) that can be used (see `past_key_values` input) to speed up sequential decoding.
+
+            If `past_key_values` are used, the user can optionally input only the last `decoder_input_ids` (those that
+            don't have their past key value states given to this model) of shape `(batch_size, 1)` instead of all
+            `decoder_input_ids` of shape `(batch_size, sequence_length)`.
+        inputs_embeds (`torch.FloatTensor` of shape `(batch_size, sequence_length, hidden_size)`, *optional*):
+            Optionally, instead of passing `input_ids` you can choose to directly pass an embedded representation. This
+            is useful if you want more control over how to convert `input_ids` indices into associated vectors than the
+            model's internal embedding lookup matrix.
+        use_cache (`bool`, *optional*):
+            If set to `True`, `past_key_values` key value states are returned and can be used to speed up decoding (see
+            `past_key_values`).
+        output_attentions (`bool`, *optional*):
+            Whether or not to return the attentions tensors of all attention layers. See `attentions` under returned
+            tensors for more detail.
+        output_hidden_states (`bool`, *optional*):
+            Whether or not to return the hidden states of all layers. See `hidden_states` under returned tensors for
+            more detail.
+        return_dict (`bool`, *optional*):
+            Whether or not to return a [`~utils.ModelOutput`] instead of a plain tuple.
+"""
+
+
+@add_start_docstrings(
+    "The bare LLaMA Model outputting raw hidden-states without any specific head on top.",
+    LLAMA_START_DOCSTRING,
+)
+class ExtendedLlamaModel(LlamaPreTrainedModel):
+    """
+    Transformer decoder consisting of *config.num_hidden_layers* layers. Each layer is a [`LlamaDecoderLayer`]
+
+    Args:
+        config: LlamaConfig
+    """
+
+    def __init__(self, config: ExtendedLlamaConfig):
+        super().__init__(config)
+        self.padding_idx = config.pad_token_id
+        self.vocab_size = config.vocab_size
+
+        self.embed_tokens = nn.Embedding(
+            config.vocab_size, config.hidden_size, self.padding_idx
+        )
+        self.layers = nn.ModuleList(
+            [ExtendedLlamaDecoderLayer(config) for _ in range(config.num_hidden_layers)]
+        )
+        self.norm = LlamaRMSNorm(config.hidden_size, eps=config.rms_norm_eps)
+
+        self.gradient_checkpointing = False
+        # Initialize weights and apply final processing
+        self.mask_by_sim = config.mask_by_sim
+        self.sim_threshold = config.sim_threshold
+        self.topk = config.topk
+        self.use_external_mind = config.use_external_mind
+        self.use_external_mind_by_layer = config.use_external_mind_by_layer
+        self.post_init()
+
+    def get_input_embeddings(self):
+        return self.embed_tokens
+
+    def set_input_embeddings(self, value):
+        self.embed_tokens = value
+
+    # Copied from transformers.models.bart.modeling_bart.BartDecoder._prepare_decoder_attention_mask
+    def _prepare_decoder_attention_mask(
+        self, attention_mask, input_shape, inputs_embeds, past_key_values_length
+    ):
+        # create causal mask
+        # [bsz, seq_len] -> [bsz, 1, tgt_seq_len, src_seq_len]
+        combined_attention_mask = None
+        if input_shape[-1] > 1:
+            combined_attention_mask = _make_causal_mask(
+                input_shape,
+                inputs_embeds.dtype,
+                device=inputs_embeds.device,
+                past_key_values_length=past_key_values_length,
+            )
+
+        if attention_mask is not None:
+            # [bsz, seq_len] -> [bsz, 1, tgt_seq_len, src_seq_len]
+            expanded_attn_mask = _expand_mask(
+                attention_mask, inputs_embeds.dtype, tgt_len=input_shape[-1]
+            ).to(inputs_embeds.device)
+            combined_attention_mask = (
+                expanded_attn_mask
+                if combined_attention_mask is None
+                else expanded_attn_mask + combined_attention_mask
+            )
+
+        return combined_attention_mask
+
+    @add_start_docstrings_to_model_forward(LLAMA_INPUTS_DOCSTRING)
+    def forward(
+        self,
+        input_ids: torch.LongTensor = None,
+        attention_mask: Optional[torch.Tensor] = None,
+        position_ids: Optional[torch.LongTensor] = None,
+        past_key_values: Optional[List[torch.FloatTensor]] = None,
+        inputs_embeds: Optional[torch.FloatTensor] = None,
+        use_cache: Optional[bool] = None,
+        output_attentions: Optional[bool] = None,
+        output_retrieved_memory_idx: Optional[bool] = None,
+        output_hidden_states: Optional[bool] = None,
+        return_dict: Optional[bool] = None,
+        use_external_mind: Optional[bool] = None,
+        long_range_past_key_values: Optional[List[Tuple[torch.FloatTensor]]] = None,
+        faiss_indexes: Tuple = None,
+        topk: int = None,
+    ) -> Union[Tuple, BaseModelOutputWithPast]:
+        """forward"""
+        output_attentions = (
+            output_attentions
+            if output_attentions is not None
+            else self.config.output_attentions
+        )
+        output_retrieved_memory_idx = (
+            output_retrieved_memory_idx
+            if output_retrieved_memory_idx is not None
+            else False
+        )
+        output_hidden_states = (
+            output_hidden_states
+            if output_hidden_states is not None
+            else self.config.output_hidden_states
+        )
+        use_cache = use_cache if use_cache is not None else self.config.use_cache
+
+        return_dict = (
+            return_dict if return_dict is not None else self.config.use_return_dict
+        )
+        use_external_mind = (
+            use_external_mind
+            if use_external_mind is not None
+            else self.use_external_mind
+        )
+        topk = topk if topk is not None else self.topk
+
+        # retrieve input_ids and inputs_embeds
+        if input_ids is not None and inputs_embeds is not None:
+            raise ValueError(
+                "You cannot specify both decoder_input_ids and decoder_inputs_embeds at the same time"
+            )
+        elif input_ids is not None:
+            batch_size, seq_length = input_ids.shape
+        elif inputs_embeds is not None:
+            batch_size, seq_length, _ = inputs_embeds.shape
+        else:
+            raise ValueError(
+                "You have to specify either decoder_input_ids or decoder_inputs_embeds"
+            )
+
+        seq_length_with_past = seq_length
+        past_key_values_length = 0
+
+        if past_key_values is not None:
+            past_key_values_length = past_key_values[0][0].shape[2]
+            seq_length_with_past = seq_length_with_past + past_key_values_length
+
+        # EM: Range of position ids is total seq length since we apply rotary pos emb after reading from cache
+        if position_ids is None:
+            device = input_ids.device if input_ids is not None else inputs_embeds.device
+            position_ids = torch.arange(
+                seq_length_with_past,
+                dtype=torch.long,
+                device=device,
+            )
+            position_ids = position_ids.unsqueeze(0).view(-1, seq_length_with_past)
+        else:
+            position_ids = position_ids.view(-1, seq_length_with_past).long()
+
+        if inputs_embeds is None:
+            inputs_embeds = self.embed_tokens(input_ids)
+        # embed positions
+        if attention_mask is None:
+            attention_mask = torch.ones(
+                (batch_size, seq_length_with_past),
+                dtype=torch.bool,
+                device=inputs_embeds.device,
+            )
+        attention_mask = self._prepare_decoder_attention_mask(
+            attention_mask,
+            (batch_size, seq_length),
+            inputs_embeds,
+            past_key_values_length,
+        )
+
+        hidden_states = inputs_embeds
+
+        if self.gradient_checkpointing and self.training:
+            if use_cache:
+                logger.warning_once(
+                    "`use_cache=True` is incompatible with gradient checkpointing. Setting `use_cache=False`..."
+                )
+                use_cache = False
+
+        # decoder layers
+        all_hidden_states = () if output_hidden_states else None
+        all_self_attns = () if output_attentions else None
+        next_decoder_cache = () if use_cache else None
+        all_idx = () if output_retrieved_memory_idx else None
+
+        for idx, decoder_layer in enumerate(self.layers):
+            if output_hidden_states:
+                all_hidden_states += (hidden_states,)
+
+            past_key_value = (
+                past_key_values[idx] if past_key_values is not None else None
+            )
+
+            long_range_past_key_value = (
+                long_range_past_key_values[idx]
+                if (
+                    long_range_past_key_values is not None
+                    and self.use_external_mind_by_layer[idx]
+                    and use_external_mind is True
+                )
+                else None
+            )
+
+            if long_range_past_key_value is not None and faiss_indexes is not None:
+                raise NotImplementedError(
+                    """Using faiss and passing key value pairs
+                    manually are mutually exclusive right now."""
+                )
+
+            if self.gradient_checkpointing and self.training:
+
+                def create_custom_forward(module):
+                    def custom_forward(*inputs):
+                        # None for past_key_value
+                        return module(*inputs, past_key_value, output_attentions)
+
+                    return custom_forward
+
+                layer_outputs = torch.utils.checkpoint.checkpoint(
+                    create_custom_forward(decoder_layer),
+                    hidden_states,
+                    attention_mask,
+                    position_ids,
+                )
+            else:
+                layer_outputs = decoder_layer(
+                    hidden_states,
+                    attention_mask=attention_mask,
+                    position_ids=position_ids,
+                    past_key_value=past_key_value,
+                    output_attentions=output_attentions,
+                    output_retrieved_memory_idx=output_retrieved_memory_idx,
+                    use_cache=use_cache,
+                    topk=topk,
+                    long_range_past_key_value=long_range_past_key_value,
+                    faiss_indexes=faiss_indexes,
+                    mask_by_sim=self.mask_by_sim,
+                    sim_threshold=self.sim_threshold,
+                    current_layer=idx,
+                )
+
+            hidden_states = layer_outputs[0]
+
+            if use_cache:
+                next_decoder_cache += (layer_outputs[2 if output_attentions else 1],)
+
+            if output_attentions:
+                all_self_attns += (layer_outputs[1],)
+
+            if output_retrieved_memory_idx:
+                idx = (
+                    3
+                    if (use_cache & output_attentions)
+                    else 2
+                    if (use_cache or output_attentions)
+                    else 1
+                )
+                all_idx += (layer_outputs[idx],)  # Record which memories were retrieved
+        hidden_states = self.norm(hidden_states)
+
+        # add hidden states from the last decoder layer
+        if output_hidden_states:
+            all_hidden_states += (hidden_states,)
+
+        next_cache = next_decoder_cache if use_cache else None
+        if not return_dict:
+            return tuple(
+                v
+                for v in [
+                    hidden_states,
+                    next_cache,
+                    all_hidden_states,
+                    all_self_attns,
+                    all_idx,
+                ]
+                if v is not None
+            )
+        return BaseModelOutputWithPast(
+            last_hidden_state=hidden_states,
+            past_key_values=next_cache,
+            hidden_states=all_hidden_states,
+            attentions=(all_self_attns, all_idx),  # EM: Return idx of retrieved memories
+        )
+
+
+class ExtendedLlamaForCausalLM(LlamaPreTrainedModel):
+    """LlamaForCausalLM"""
+
+    _tied_weights_keys = ["lm_head.weight"]
+
+    def __init__(self, config, external_memories=None):
+        super().__init__(config)
+        self.model = ExtendedLlamaModel(config)
+        self.vocab_size = config.vocab_size
+        self.tokenizer_all_special_ids = config.tokenizer_all_special_ids
+        self.lm_head = nn.Linear(config.hidden_size, config.vocab_size, bias=False)
+
+        self.use_external_mind = config.use_external_mind
+        self.memory_type = config.memory_type
+        self.memory_device = config.memory_device
+        self.remove_special_ids = config.remove_special_ids
+        self.memory_ids = None
+        self.memories = None
+
+        # EM: Memory token ids
+        if external_memories is not None:
+            self.memory_ids = external_memories
+
+        # Initialize weights and apply final processing
+        self.post_init()
+
+    # EM: Clear memory cache
+    def clear_memory(self):
+        """Clear memory cache."""
+        self.memory_ids = None
+        self.memories = None
+
+    def get_input_embeddings(self):
+        return self.model.embed_tokens
+
+    def set_input_embeddings(self, value):
+        self.model.embed_tokens = value
+
+    def get_output_embeddings(self):
+        return self.lm_head
+
+    def set_output_embeddings(self, new_embeddings):
+        """Set output embeddings."""
+        self.lm_head = new_embeddings
+
+    def set_decoder(self, decoder):
+        """Set decoder."""
+        self.model = decoder
+
+    def get_decoder(self):
+        """Get decoder."""
+        return self.model
+
+    @add_start_docstrings_to_model_forward(LLAMA_INPUTS_DOCSTRING)
+    @replace_return_docstrings(
+        output_type=CausalLMOutputWithPast, config_class=_CONFIG_FOR_DOC
+    )
+    def forward(
+        self,
+        input_ids: torch.LongTensor = None,
+        attention_mask: Optional[torch.Tensor] = None,
+        position_ids: Optional[torch.LongTensor] = None,
+        past_key_values: Optional[List[torch.FloatTensor]] = None,
+        inputs_embeds: Optional[torch.FloatTensor] = None,
+        labels: Optional[torch.LongTensor] = None,
+        use_cache: Optional[bool] = None,
+        output_attentions: Optional[bool] = None,
+        output_hidden_states: Optional[bool] = None,
+        output_retrieved_memory_idx: Optional[bool] = None,
+        return_dict: Optional[bool] = None,
+        use_external_mind: Optional[bool] = None,
+        topk: int = None,
+    ) -> Union[Tuple, CausalLMOutputWithPast]:
+        r"""
+        Args:
+            labels (`torch.LongTensor` of shape `(batch_size, sequence_length)`, *optional*):
+                Labels for computing the masked language modeling loss. Indices should either be in `[0, ...,
+                config.vocab_size]` or -100 (see `input_ids` docstring). Tokens with indices set to `-100` are ignored
+                (masked), the loss is only computed for the tokens with labels in `[0, ..., config.vocab_size]`.
+
+        Returns:
+
+        Example:
+
+        ```python
+        >>> from transformers import AutoTokenizer, LlamaForCausalLM
+
+        >>> model = LlamaForCausalLM.from_pretrained(PATH_TO_CONVERTED_WEIGHTS)
+        >>> tokenizer = AutoTokenizer.from_pretrained(PATH_TO_CONVERTED_TOKENIZER)
+
+        >>> prompt = "Hey, are you conscious? Can you talk to me?"
+        >>> inputs = tokenizer(prompt, return_tensors="pt")
+
+        >>> # Generate
+        >>> generate_ids = model.generate(inputs.input_ids, max_length=30)
+        >>> tokenizer.batch_decode(generate_ids, skip_special_tokens=True, clean_up_tokenization_spaces=False)[0]
+        "Hey, are you conscious? Can you talk to me?\nI'm not conscious, but I can talk to you."
+        ```"""
+
+        # EM: Generate key value cache once on first call
+        if (
+            self.memory_ids is not None and self.memories is None
+        ): 
+            self.memories = self.generate_cache(
+                torch.tensor(self.memory_ids, device=self.device),
+                cache_type=self.memory_type,
+            )
+            # EM: Remove special tokens from memory cache
+            if self.remove_special_ids:
+                idx_to_remove = [
+                    token_idx
+                    for token_idx, token in enumerate(self.memory_ids[0])
+                    if token in self.tokenizer_all_special_ids
+                ]
+                if self.memory_type == "manual":
+                    mask = torch.ones(self.memories[0][0].size(), dtype=torch.bool)
+                    mask[:, :, idx_to_remove, :] = False
+
+                    new_size = (
+                        self.memories[0][0].size(0),
+                        self.memories[0][0].size(1),
+                        -1,
+                        self.memories[0][0].size(3),
+                    )
+                    self.memories = [
+                        (ks[mask].view(new_size), vs[mask].view(new_size))
+                        for ks, vs in self.memories
+                    ]
+                else:
+                    kn_index, kv_index = self.memories
+                    all_idx_to_remove = [
+                        [
+                            i
+                            for i in range(0, kn_index.ntotal)
+                            if (
+                                i
+                                % (
+                                    kn_index.ntotal
+                                    / (
+                                        self.config.num_attention_heads
+                                        * self.config.num_hidden_layers
+                                    )
+                                )
+                            )
+                            == j
+                        ]
+                        for j in idx_to_remove
+                    ]
+                    kn_index.remove_ids(
+                        np.array(all_idx_to_remove).flatten().astype("int64")
+                    )
+                    kv_index.remove_ids(
+                        np.array(all_idx_to_remove).flatten().astype("int64")
+                    )
+
+        output_attentions = (
+            output_attentions
+            if output_attentions is not None
+            else self.config.output_attentions
+        )
+        output_retrieved_memory_idx = (
+            output_retrieved_memory_idx
+            if output_retrieved_memory_idx is not None
+            else False
+        )
+        output_hidden_states = (
+            output_hidden_states
+            if output_hidden_states is not None
+            else self.config.output_hidden_states
+        )
+        return_dict = (
+            return_dict if return_dict is not None else self.config.use_return_dict
+        )
+
+        use_external_mind = (
+            use_external_mind
+            if use_external_mind is not None
+            else self.use_external_mind
+        )
+        topk = topk if topk is not None else None
+
+        long_range_past_key_values = None
+        faiss_indexes = None
+        if hasattr(self, "memories") and isinstance(self.memories, list):
+            long_range_past_key_values = self.memories
+        elif hasattr(self, "memories"):
+            faiss_indexes = self.memories
+
+        # decoder outputs consists of (dec_features, layer_state, dec_hidden, dec_attn)
+        outputs = self.model(
+            input_ids=input_ids,
+            attention_mask=attention_mask,
+            position_ids=position_ids,
+            past_key_values=past_key_values,
+            inputs_embeds=inputs_embeds,
+            use_cache=use_cache,
+            output_attentions=output_attentions,
+            output_retrieved_memory_idx=output_retrieved_memory_idx,
+            output_hidden_states=output_hidden_states,
+            return_dict=return_dict,
+            long_range_past_key_values=long_range_past_key_values,
+            faiss_indexes=faiss_indexes,
+            use_external_mind=use_external_mind,
+            topk=topk,
+        )
+
+        hidden_states = outputs[0]
+        if self.config.pretraining_tp > 1:
+            lm_head_slices = self.lm_head.weight.split(
+                self.vocab_size // self.config.pretraining_tp, dim=0
+            )
+            logits = [
+                F.linear(hidden_states, lm_head_slices[i])
+                for i in range(self.config.pretraining_tp)
+            ]
+            logits = torch.cat(logits, dim=-1)
+        else:
+            logits = self.lm_head(hidden_states)
+        logits = logits.float()
+
+        loss = None
+        if labels is not None:
+            # Shift so that tokens < n predict n
+            shift_logits = logits[..., :-1, :].contiguous()
+            shift_labels = labels[..., 1:].contiguous()
+            # Flatten the tokens
+            loss_fct = CrossEntropyLoss()
+            shift_logits = shift_logits.view(-1, self.config.vocab_size)
+            shift_labels = shift_labels.view(-1)
+            # Enable model parallelism
+            shift_labels = shift_labels.to(shift_logits.device)
+            loss = loss_fct(shift_logits, shift_labels)
+
+        if not return_dict:
+            output = (logits,) + outputs[1:]
+            return (loss,) + output if loss is not None else output
+
+        return CausalLMOutputWithPast(
+            loss=loss,
+            logits=logits,
+            past_key_values=outputs.past_key_values,
+            hidden_states=outputs.hidden_states,
+            attentions=outputs.attentions,
+        )
+
+    # EM: Add method to generate key-value cache
+    def generate_cache(
+        self,
+        input_ids: torch.LongTensor,
+        stride: int = 512,
+        max_len: int = 3072,
+        cache_type: str = "manual",
+    ):
+        """Stride over memory inputs to get kv pairs"""
+        if cache_type not in ["manual", "faiss"]:
+            raise NotImplementedError(f"Cache type {cache_type} not implemented.")
+
+        prev_end_loc = 0
+        long_range_past_key_values = None
+        faiss_indexes = None
+        for b_idx in range(
+            0, input_ids.size(-1), stride
+        ):  # generate kv-pairs using stride
+            end_loc = min(b_idx + max_len, input_ids.size(-1))
+            trg_len = end_loc - prev_end_loc
+            subseq = input_ids[:, b_idx:end_loc].to(self.model.device)
+            with torch.inference_mode():
+                outputs = self.model(
+                    subseq,
+                    use_cache=True,
+                    use_external_mind=False,
+                )
+            to_cache = [
+                (kv[0][:, :, -trg_len:], kv[1][:, :, -trg_len:])
+                for kv in outputs.past_key_values
+            ]
+            long_range_past_key_values, faiss_indexes = self.cache(
+                to_cache,
+                cache_type,
+                long_range_past_key_values=long_range_past_key_values,
+                faiss_indexes=faiss_indexes,
+            )
+
+            prev_end_loc = end_loc
+            if end_loc == input_ids.size(-1):
+                break
+        if long_range_past_key_values is not None:
+            return long_range_past_key_values
+        else:
+            return faiss_indexes
+
+    # EM: Add method to cache key value pairs
+    def cache(
+        self,
+        to_cache: List,
+        cache_type: str = "manual",
+        long_range_past_key_values: List = None,
+        faiss_indexes: faiss.IndexFlatIP = None,
+        max_length_cache=100000,
+        verbose=False,
+    ):
+        """Cache key value pairs for Extended Mind attention."""
+        if (long_range_past_key_values is not None) & (faiss_indexes is not None):
+            raise NotImplementedError(
+                "Using faiss and passing key value pairs manually are mutually exclusive right now."
+            )
+        # To avoid spinning up a new index for each layer, we add one-hot encodings to the keys so that queries match with the appropriate layer, head
+        if cache_type == "faiss":  # add one-hot encoding to match layer, head indices
+            one_hot_encodings = (
+                F.one_hot(
+                    torch.arange(
+                        0,
+                        self.config.num_attention_heads * self.config.num_hidden_layers,
+                    )
+                )
+                * 10
+            )
+            # New indices, one to store normalized keys with one-hot encodings, another to retrieve kv pairs without normalization
+            if faiss_indexes is None:
+                faiss_indexes = (
+                    faiss.IndexFlatIP(
+                        to_cache[0][0].size(-1) + one_hot_encodings.size(-1)
+                    ),
+                    faiss.IndexFlatIP(to_cache[0][0].size(-1) * 2),
+                )
+            kn_index, kv_index = faiss_indexes
+            for l_idx, (k, v) in enumerate(to_cache):
+                k_n = (k / vector_norm(k, ord=2, dim=-1, keepdim=True)).to("cpu") #Normalize keys for cosine sim
+                # Indices are 2 dimensional, so flatten 
+
+                # Add normalized keys with one-hot encodings
+                k_n = torch.concat(
+                    [
+                        rearrange(
+                            k_n,
+                            "b h s d -> b (h s) d",
+                            h=self.config.num_attention_heads,
+                        ),
+                        one_hot_encodings[
+                            self.config.num_attention_heads
+                            * l_idx : self.config.num_attention_heads
+                            * (l_idx + 1)
+                        ]
+                        .unsqueeze(0)
+                        .repeat_interleave(repeats=k.size(-2), dim=-2),
+                    ],
+                    dim=-1,
+                )
+                kn_index.add(k_n.squeeze().numpy())
+
+                # Add unnormalized keys and values
+                k = rearrange(
+                    k, "b h s d -> b (h s) d", h=self.config.num_attention_heads
+                )
+                v = rearrange(
+                    v, "b h s d -> b (h s) d", h=self.config.num_attention_heads
+                )
+                kv_index.add(
+                    torch.concat([k.squeeze(), v.squeeze()], dim=1).to("cpu").numpy()
+                )
+        else:
+            # Simply use list to store key value pairs
+            if long_range_past_key_values is None:
+                long_range_past_key_values = [
+                    (k.to(self.memory_device), v.to(self.memory_device))
+                    for k, v in to_cache
+                ]
+            else:
+                long_range_past_key_values = [
+                    (
+                        torch.concat(
+                            [kv[0], to_cache[ind][0].to(self.memory_device)], dim=2
+                        ),
+                        torch.concat(
+                            [kv[1], to_cache[ind][1].to(self.memory_device)], dim=2
+                        ),
+                    )
+                    for ind, kv in enumerate(long_range_past_key_values)
+                ]
+        if (
+            long_range_past_key_values is not None
+        ):  # set a limit on manual memory length
+            if long_range_past_key_values[0][0].size(-2) > max_length_cache:
+                long_range_past_key_values = [
+                    (kv[0][:, :, -max_length_cache:], kv[1][:, :, -max_length_cache:])
+                    for kv in long_range_past_key_values
+                ]
+        if verbose:
+            if cache_type == "faiss":
+                print(f"{kn_index.ntotal} keys in faiss index")
+            else:
+                print(f"{long_range_past_key_values[0][0].size(-2)} cached kvs")
+
+        return (
+            long_range_past_key_values,
+            (kn_index, kv_index) if cache_type == "faiss" else None,
+        )
+
+    def prepare_inputs_for_generation(
+        self,
+        input_ids,
+        past_key_values=None,
+        attention_mask=None,
+        inputs_embeds=None,
+        **kwargs,
+    ):
+        if past_key_values:
+            input_ids = input_ids[:, -1:]
+
+        position_ids = kwargs.get("position_ids", None)
+        if attention_mask is not None and position_ids is None:
+            # create position_ids on the fly for batch generation
+            position_ids = attention_mask.long().cumsum(-1) - 1
+            position_ids.masked_fill_(attention_mask == 0, 1)
+
+        # if `inputs_embeds` are passed, we only want to use them in the 1st generation step
+        if inputs_embeds is not None and past_key_values is None:
+            model_inputs = {"inputs_embeds": inputs_embeds}
+        else:
+            model_inputs = {"input_ids": input_ids}
+
+        model_inputs.update(
+            {
+                "position_ids": position_ids,
+                "past_key_values": past_key_values,
+                "use_cache": kwargs.get("use_cache"),
+                "attention_mask": attention_mask,
+                "use_external_mind": kwargs.get("use_external_mind"), # EM: Add config here
+                "topk": kwargs.get("topk"),
+            }
+        )
+        return model_inputs
+
+    @staticmethod
+    def _reorder_cache(past_key_values, beam_idx):
+        reordered_past = ()
+        for layer_past in past_key_values:
+            reordered_past += (
+                tuple(
+                    past_state.index_select(0, beam_idx.to(past_state.device))
+                    for past_state in layer_past
+                ),
+            )
+        return reordered_past