internlm-xcomposer2-vl-7b / modeling_internlm2.py

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	# # Copyright (c) InternLM. 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.
	"""PyTorch InternLM2 model."""
	import math
	import warnings
	from typing import List, Optional, Tuple, Union

	import torch
	import torch.utils.checkpoint
	from einops import rearrange
	from torch import nn
	from transformers.activations import ACT2FN
	from transformers.modeling_outputs import BaseModelOutputWithPast
	from transformers.modeling_utils import PreTrainedModel
	from transformers.utils import (add_start_docstrings,
	add_start_docstrings_to_model_forward, logging)

	try:
	from transformers.generation.streamers import BaseStreamer
	except: # noqa # pylint: disable=bare-except
	BaseStreamer = None

	from .build_mlp import PLoRA
	from .configuration_internlm_xcomposer2 import InternLMXcomposer2Config as InternLM2Config
	logger = logging.get_logger(__name__)

	_CONFIG_FOR_DOC = 'InternLM2Config'


	# 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.tensor(torch.finfo(dtype).min, device=device),
	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 InternLM2RMSNorm(nn.Module):

	def __init__(self, hidden_size, eps=1e-6):
	"""InternLM2RMSNorm is equivalent to T5LayerNorm."""
	super().__init__()
	self.weight = nn.Parameter(torch.ones(hidden_size))
	self.variance_epsilon = eps

	def forward(self, hidden_states):
	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 InternLM2RotaryEmbedding(nn.Module):

	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().to(dtype), persistent=False)
	self.register_buffer(
	'sin_cached', emb.sin().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 InternLM2LinearScalingRotaryEmbedding(InternLM2RotaryEmbedding):
	"""InternLM2RotaryEmbedding 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().to(dtype), persistent=False)
	self.register_buffer(
	'sin_cached', emb.sin().to(dtype), persistent=False)


	class InternLM2DynamicNTKScalingRotaryEmbedding(InternLM2RotaryEmbedding):
	"""InternLM2RotaryEmbedding 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().to(dtype), persistent=False)
	self.register_buffer(
	'sin_cached', emb.sin().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):
	# 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]
	cos = cos.unsqueeze(0).unsqueeze(0).expand(len(position_ids), -1, -1, -1)
	sin = sin.unsqueeze(0).unsqueeze(0).expand(len(position_ids), -1, -1, -1)
	if q.size(2) == 1:
	q_embed = (q * cos[:, :, -1:, :]) + (
	rotate_half(q) * sin[:, :, -1:, :])
	else:
	q_embed = (q * cos) + (rotate_half(q) * sin)

	if k.size(2) == 1:
	k_embed = (k * cos[:, :, -1:, :]) + (
	rotate_half(k) * sin[:, :, -1:, :])
	else:
	k_embed = (k * cos) + (rotate_half(k) * sin)

	return q_embed, k_embed


	class InternLM2MLP(nn.Module):

	def __init__(self, config):
	super().__init__()
	self.config = config
	self.hidden_size = config.hidden_size
	self.intermediate_size = config.intermediate_size

	self.w1 = PLoRA(
	self.hidden_size,
	self.intermediate_size,
	bias=False,
	lora_r=256,
	lora_alpha=256,
	lora_len=576)
	self.w3 = PLoRA(
	self.hidden_size,
	self.intermediate_size,
	bias=False,
	lora_r=256,
	lora_alpha=256,
	lora_len=576)
	self.w2 = PLoRA(
	self.intermediate_size,
	self.hidden_size,
	bias=False,
	lora_r=256,
	lora_alpha=256,
	lora_len=576)

	self.act_fn = ACT2FN[config.hidden_act]

	def forward(self, x, im_mask):
	down_proj = self.w2(
	self.act_fn(self.w1(x, im_mask)) * self.w3(x, im_mask), im_mask)

	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 InternLM2Attention(nn.Module):
	"""Multi-headed attention from 'Attention Is All You Need' paper."""

	def __init__(self, config: InternLM2Config):
	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.is_causal = True

	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.wqkv = PLoRA(
	self.hidden_size,
	(self.num_heads + 2 * self.num_key_value_heads) * self.head_dim,
	bias=config.bias,
	lora_r=256,
	lora_alpha=256,
	lora_len=576)

	self.wo = PLoRA(
	self.num_heads * self.head_dim,
	self.hidden_size,
	bias=config.bias,
	lora_r=256,
	lora_alpha=256,
	lora_len=576)
	self._init_rope()

	def _init_rope(self):
	if self.config.rope_scaling is None:
	self.rotary_emb = InternLM2RotaryEmbedding(
	self.head_dim,
	max_position_embeddings=self.max_position_embeddings,
	base=self.config.rope_theta,
	)
	else:
	scaling_type = self.config.rope_scaling['type']
	scaling_factor = self.config.rope_scaling['factor']
	if scaling_type == 'dynamic':
	self.rotary_emb = InternLM2DynamicNTKScalingRotaryEmbedding(
	self.head_dim,
	max_position_embeddings=self.max_position_embeddings,
	base=self.config.rope_theta,
	scaling_factor=scaling_factor)
	else:
	raise ValueError(
	"Currently we only support rotary embedding's type being 'dynamic'."
	)
	return self.rotary_emb

	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,
	use_cache: bool = False,
	im_mask: Optional[Tuple[torch.Tensor]] = None,
	**kwargs,
	) -> Tuple[torch.Tensor, Optional[torch.Tensor],
	Optional[Tuple[torch.Tensor]]]:
	if 'padding_mask' in kwargs:
	warnings.warn(
	'Passing `padding_mask` is deprecated and will be removed in v4.37. '
	'Please make sure use `attention_mask` instead.`')

	bsz, q_len, _ = hidden_states.size()

	qkv_states = self.wqkv(hidden_states, im_mask)

	qkv_states = rearrange(
	qkv_states,
	'b q (h gs d) -> b q h gs d',
	gs=2 + self.num_key_value_groups,
	d=self.head_dim,
	)

	query_states = qkv_states[..., :self.num_key_value_groups, :]
	query_states = rearrange(query_states, 'b q h gs d -> b q (h gs) d')
	key_states = qkv_states[..., -2, :]
	value_states = qkv_states[..., -1, :]

	query_states = query_states.transpose(1, 2)
	key_states = key_states.transpose(1, 2)
	value_states = value_states.transpose(1, 2)

	kv_seq_len = key_states.shape[-2]
	if past_key_value is not None:
	kv_seq_len += past_key_value[0].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)

	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

	key_states = repeat_kv(key_states, self.num_key_value_groups)
	value_states = repeat_kv(value_states, self.num_key_value_groups)

	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()}')

	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()}'
	)
	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)

	attn_output = self.wo(attn_output, im_mask)

	if not output_attentions:
	attn_weights = None

	return attn_output, attn_weights, past_key_value


	class InternLM2FlashAttention2(InternLM2Attention):
	"""InternLM2 flash attention module.

	This module inherits from `InternLM2Attention` as the weights of the module
	stays untouched. The only required change would be on the forward pass
	where it needs to correctly call the public API of flash attention and deal
	with padding tokens in case the input contains any of them.
	"""

	def forward(
	self,
	hidden_states: torch.Tensor,
	attention_mask: Optional[torch.LongTensor] = None,
	position_ids: Optional[torch.LongTensor] = None,
	past_key_value: Optional[Tuple[torch.Tensor]] = None,
	output_attentions: bool = False,
	use_cache: bool = False,
	im_mask: Optional[Tuple[torch.Tensor]] = None,
	**kwargs,
	) -> Tuple[torch.Tensor, Optional[torch.Tensor],
	Optional[Tuple[torch.Tensor]]]:
	# InternLM2FlashAttention2 attention does not support output_attentions
	if 'padding_mask' in kwargs:
	warnings.warn(
	'Passing `padding_mask` is deprecated and will be removed in v4.37. '
	'Please make sure use `attention_mask` instead.`')

	# overwrite attention_mask with padding_mask
	attention_mask = kwargs.pop('padding_mask')

	output_attentions = False

	bsz, q_len, _ = hidden_states.size()

	qkv_states = self.wqkv(hidden_states, im_mask)

	qkv_states = rearrange(
	qkv_states,
	'b q (h gs d) -> b q h gs d',
	gs=self.num_heads + 2 * self.num_key_value_heads,
	d=self.head_dim,
	q=q_len,
	)

	query_states = qkv_states[..., :self.num_key_value_groups, :]
	query_states = rearrange(query_states, 'b q h gs d -> b q (h gs) d')
	key_states = qkv_states[..., -2, :]
	value_states = qkv_states[..., -1, :]

	kv_seq_len = key_states.shape[-2]
	if past_key_value is not None:
	kv_seq_len += past_key_value[0].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)

	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

	query_states = query_states.transpose(1, 2)
	key_states = key_states.transpose(1, 2)
	value_states = value_states.transpose(1, 2)

	dropout_rate = 0.0 if not self.training else self.attention_dropout

	# In PEFT, usually we cast the layer norms in float32 for training stability reasons
	# therefore the input hidden states gets silently casted in float32. Hence, we need
	# cast them back in the correct dtype just to be sure everything works as expected.
	# This might slowdown training & inference so it is recommended to not cast the LayerNorms
	# in fp32. (InternLM2RMSNorm handles it correctly)

	input_dtype = query_states.dtype
	if input_dtype == torch.float32:
	# Handle the case where the model is quantized
	if hasattr(self.config, '_pre_quantization_dtype'):
	target_dtype = self.config._pre_quantization_dtype
	else:
	target_dtype = self.q_proj.weight.dtype

	logger.warning_once(
	f'The input hidden states seems to be silently casted in float32, this might be related to'
	f' the fact you have upcasted embedding or layer norm layers in float32. We will cast back '
	f'the input in {target_dtype}.')

	query_states = query_states.to(target_dtype)
	key_states = key_states.to(target_dtype)
	value_states = value_states.to(target_dtype)

	attn_output = self._flash_attention_forward(
	query_states,
	key_states,
	value_states,
	attention_mask,
	q_len,
	dropout=dropout_rate)

	attn_output = attn_output.reshape(bsz, q_len,
	self.hidden_size).contiguous()
	attn_output = self.wo(attn_output, im_mask)

	if not output_attentions:
	attn_weights = None

	return attn_output, attn_weights, past_key_value


	class InternLM2DecoderLayer(nn.Module):

	def __init__(self, config: InternLM2Config):
	super().__init__()
	self.hidden_size = config.hidden_size
	self.attention = (
	InternLM2Attention(config=config)
	if not getattr(config, '_flash_attn_2_enabled', False) else
	InternLM2FlashAttention2(config=config))
	self.feed_forward = InternLM2MLP(config)
	self.attention_norm = InternLM2RMSNorm(
	config.hidden_size, eps=config.rms_norm_eps)
	self.ffn_norm = InternLM2RMSNorm(
	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,
	use_cache: Optional[bool] = False,
	im_mask: Optional[Tuple[torch.Tensor]] = None,
	**kwargs,
	) -> 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_size, sequence_length)` if flash attention is used or `(batch_size, 1,
	query_sequence_length, key_sequence_length)` if default attention is used.
	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
	"""
	if 'padding_mask' in kwargs:
	warnings.warn(
	'Passing `padding_mask` is deprecated and will be removed in v4.37. '
	'Please make sure use `attention_mask` instead.`')

	residual = hidden_states

	hidden_states = self.attention_norm(hidden_states)

	# Self Attention
	hidden_states, self_attn_weights, present_key_value = self.attention(
	hidden_states=hidden_states,
	attention_mask=attention_mask,
	position_ids=position_ids,
	past_key_value=past_key_value,
	output_attentions=output_attentions,
	use_cache=use_cache,
	im_mask=im_mask,
	**kwargs,
	)
	hidden_states = residual + hidden_states

	# Fully Connected
	residual = hidden_states
	hidden_states = self.ffn_norm(hidden_states)
	hidden_states = self.feed_forward(hidden_states, im_mask)
	hidden_states = residual + hidden_states

	outputs = (hidden_states, )

	if output_attentions:
	outputs += (self_attn_weights, )

	if use_cache:
	outputs += (present_key_value, )

	return outputs


	InternLM2_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 ([`InternLM2Config`]):
	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 InternLM2 Model outputting raw hidden-states without any specific head on top.',
	InternLM2_START_DOCSTRING,
	)
	class InternLM2PreTrainedModel(PreTrainedModel):
	config_class = InternLM2Config
	base_model_prefix = 'model'
	supports_gradient_checkpointing = True
	_no_split_modules = ['InternLM2DecoderLayer']
	_skip_keys_device_placement = 'past_key_values'
	_supports_flash_attn_2 = True

	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_()


	InternLM2_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 `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, decoder_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 `input_ids` (those that don't
	have their past key value states given to this model) of shape `(batch_size, 1)` instead of all `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 InternLM2 Model outputting raw hidden-states without any specific head on top.',
	InternLM2_START_DOCSTRING,
	)
	class InternLM2Model(InternLM2PreTrainedModel):
	"""Transformer decoder consisting of config.num_hidden_layers layers.
	Each layer is a [`InternLM2DecoderLayer`]

	Args:
	config: InternLM2Config
	"""

	_auto_class = 'AutoModel'

	def __init__(self, config: InternLM2Config):
	super().__init__(config)
	self.padding_idx = config.pad_token_id
	self.vocab_size = config.vocab_size

	self.tok_embeddings = nn.Embedding(config.vocab_size,
	config.hidden_size,
	self.padding_idx)
	self.layers = nn.ModuleList([
	InternLM2DecoderLayer(config)
	for _ in range(config.num_hidden_layers)
	])
	self.norm = InternLM2RMSNorm(
	config.hidden_size, eps=config.rms_norm_eps)

	self.gradient_checkpointing = False
	# Initialize weights and apply final processing
	self.post_init()

	def get_input_embeddings(self):
	return self.tok_embeddings

	def set_input_embeddings(self, value):
	self.tok_embeddings = 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(InternLM2_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_hidden_states: Optional[bool] = None,
	return_dict: Optional[bool] = None,
	**kwargs) -> Union[Tuple, BaseModelOutputWithPast]:

	im_mask = kwargs.get('im_mask', None)

	output_attentions = output_attentions if output_attentions is not None else self.config.output_attentions
	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

	# retrieve input_ids and inputs_embeds
	if input_ids is not None and inputs_embeds is not None:
	raise ValueError(
	'You cannot specify both input_ids and inputs_embeds at the same time'
	)
	elif input_ids is not None:
	batch_size, seq_length = input_ids.shape[:2]
	elif inputs_embeds is not None:
	batch_size, seq_length = inputs_embeds.shape[:2]
	else:
	raise ValueError(
	'You have to specify either input_ids or 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

	if position_ids is None:
	device = input_ids.device if input_ids is not None else inputs_embeds.device
	position_ids = torch.arange(
	past_key_values_length,
	seq_length + past_key_values_length,
	dtype=torch.long,
	device=device)
	position_ids = position_ids.unsqueeze(0)

	if inputs_embeds is None:
	inputs_embeds = self.tok_embeddings(input_ids)
	im_mask = torch.zeros(inputs_embeds.shape[:2]).to(
	inputs_embeds.device).bool()
	# 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)

	# embed positions
	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

	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

	if self.gradient_checkpointing and self.training:

	def create_custom_forward(module):

	def custom_forward(*inputs):
	# None for past_key_value
	return module(*inputs, output_attentions, None,
	im_mask)

	return custom_forward

	layer_outputs = torch.utils.checkpoint.checkpoint(
	create_custom_forward(decoder_layer),
	hidden_states,
	attention_mask,
	position_ids,
	None,
	)
	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,
	use_cache=use_cache,
	im_mask=im_mask,
	)

	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], )

	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]
	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,
	)