File size: 9,521 Bytes
a4f2869
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
# coding=utf-8
# Copyright 2023 The OpenAI Team Authors and HuggingFace Inc. team.
# Copyright (c) 2018, NVIDIA CORPORATION.  All rights reserved.
# Copyright 2023 Cerebras Systems.
#
# 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.
""" JAIS configuration"""

from transformers.configuration_utils import PretrainedConfig
from transformers.utils import logging


logger = logging.get_logger(__name__)

class JAISConfig(PretrainedConfig):
    """
    This is the configuration class to store the configuration of a [`JAISModel`]. It is used to instantiate a JAIS
    model according to the specified arguments, defining the model architecture.

    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 50257):
            Vocabulary size of the JAIS model. Defines the number of different tokens that can be represented by the
            `inputs_ids` passed when calling [`JAISModel`].
        n_positions (`int`, *optional*, defaults to 1024):
            The maximum sequence length that this model might ever be used with. Typically set this to something large
            just in case (e.g., 512 or 1024 or 2048).
        n_embd (`int`, *optional*, defaults to 768):
            Dimensionality of the embeddings and hidden states.
        n_layer (`int`, *optional*, defaults to 12):
            Number of hidden layers in the Transformer encoder.
        n_head (`int`, *optional*, defaults to 12):
            Number of attention heads for each attention layer in the Transformer encoder.
        n_inner (`int`, *optional*, defaults to None):
            Dimensionality of the inner feed-forward layers. `None` will set it to 4 times n_embd
        activation_function (`str`, *optional*, defaults to `"gelu"`):
            Activation function, to be selected in the list `["relu", "silu", "gelu", "tanh", "gelu_new", "swiglu"]`.
        resid_pdrop (`float`, *optional*, defaults to 0.1):
            The dropout probability for all fully connected layers in the embeddings, encoder, and pooler.
        embd_pdrop (`float`, *optional*, defaults to 0.1):
            The dropout ratio for the embeddings.
        attn_pdrop (`float`, *optional*, defaults to 0.1):
            The dropout ratio for the attention.
        layer_norm_epsilon (`float`, *optional*, defaults to 1e-5):
            The epsilon to use in the layer normalization layers.
        initializer_range (`float`, *optional*, defaults to 0.02):
            The standard deviation of the truncated_normal_initializer for initializing all weight matrices.
        scale_attn_weights (`bool`, *optional*, defaults to `True`):
            Scale attention weights by dividing by sqrt(hidden_size)..
        use_cache (`bool`, *optional*, defaults to `True`):
            Whether or not the model should return the last key/values attentions (not used by all models).
        scale_attn_by_inverse_layer_idx (`bool`, *optional*, defaults to `False`):
            Whether to additionally scale attention weights by `1 / layer_idx + 1`.
        reorder_and_upcast_attn (`bool`, *optional*, defaults to `False`):
            Whether to scale keys (K) prior to computing attention (dot-product) and upcast attention
            dot-product/softmax to float() when training with mixed precision.
        position_embedding_type (`str`, *optional*, defaults to `"learned"`):
            Positional embedding can be either `"alibi"` or `"learned"`.
        mup_width_scale (`float`, *optional*, defaults to 1.0):
            muP parameter to scale learning rate and initializers. Calculated as (`d_model,0 / d_model`), where
            `d_model` is the model's width and `d_model,0` is the proxy model's width.
        mup_embeddings_scale (`float`, *optional*, defaults to 1.0):
            muP parameter to scale token and position embeddings.
        mup_output_alpha (`float`, *optional*, defaults to 1.0):
            muP parameter to scale output logits (`output_logits_scale = mup_output_alpha * mup_width_scale`).
        mup_scale_qk_dot_by_d (`bool`, *optional*, defaults to `False`):
            Scale attention weights by dividing by hidden_size instead of sqrt(hidden_size). Need to set
            scale_attn_weights to `True` as well.
        alibi_scaling (`Dict`, *optional*):
            Dictionary containing the scaling configuration for ALiBi embeddings. Currently only supports linear
            scaling strategy. Can specify either the scaling `factor` (must be a float greater than 1) for fixed scaling 
            or `train_seq_len` for dynamic scaling on input samples with sequence length > `train_seq_len`. The expected
            formats are `{"type": strategy name, "factor": scaling factor}` or
            `{"type": strategy name, "train_seq_len": training sequence length}`.

    Example:

    ```python
    >>> from transformers import JAISConfig, JAISModel

    >>> # Initializing a JAIS configuration
    >>> configuration = JAISConfig()

    >>> # Initializing a model (with random weights) from the configuration
    >>> model = JAISModel(configuration)

    >>> # Accessing the model configuration
    >>> configuration = model.config
    ```"""

    model_type = "jais"
    keys_to_ignore_at_inference = ["past_key_values"]
    attribute_map = {
        "hidden_size": "n_embd",
        "max_position_embeddings": "n_positions",
        "num_attention_heads": "n_head",
        "num_hidden_layers": "n_layer",
    }

    def __init__(
        self,
        vocab_size=50257,
        n_positions=1024,
        n_embd=768,
        n_layer=12,
        n_head=12,
        n_inner=None,
        activation_function="gelu_new",
        resid_pdrop=0.1,
        embd_pdrop=0.1,
        attn_pdrop=0.1,
        layer_norm_epsilon=1e-5,
        initializer_range=0.02,
        scale_attn_weights=True,
        use_cache=True,
        bos_token_id=50256,
        eos_token_id=50256,
        scale_attn_by_inverse_layer_idx=False,
        reorder_and_upcast_attn=False,
        position_embedding_type="learned",
        mup_width_scale=1.0,
        mup_embeddings_scale=1.0,
        mup_output_alpha=1.0,
        mup_scale_qk_dot_by_d=False,
        alibi_scaling=None,
        **kwargs,
    ):
        self.vocab_size = vocab_size
        self.n_positions = n_positions
        self.n_embd = n_embd
        self.n_layer = n_layer
        self.n_head = n_head
        self.n_inner = n_inner
        self.activation_function = activation_function
        self.resid_pdrop = resid_pdrop
        self.embd_pdrop = embd_pdrop
        self.attn_pdrop = attn_pdrop
        self.layer_norm_epsilon = layer_norm_epsilon
        self.initializer_range = initializer_range
        self.scale_attn_weights = scale_attn_weights
        self.use_cache = use_cache
        self.scale_attn_by_inverse_layer_idx = scale_attn_by_inverse_layer_idx
        self.reorder_and_upcast_attn = reorder_and_upcast_attn

        self.bos_token_id = bos_token_id
        self.eos_token_id = eos_token_id

        self.position_embedding_type = position_embedding_type
        self.mup_width_scale = mup_width_scale
        self.mup_embeddings_scale = mup_embeddings_scale
        self.mup_output_alpha = mup_output_alpha
        self.mup_scale_qk_dot_by_d = mup_scale_qk_dot_by_d

        self.alibi_scaling = alibi_scaling
        self._alibi_scaling_validation()

        super().__init__(bos_token_id=bos_token_id, eos_token_id=eos_token_id, **kwargs)

    def _alibi_scaling_validation(self):
        """
        Validate the `alibi_scaling` configuration.
        """
        if self.alibi_scaling is None:
            return

        if not isinstance(self.alibi_scaling, dict) or len(self.alibi_scaling) != 2:
            raise ValueError(
                "`alibi_scaling` must be a dictionary with two fields, `type` and `factor` or `type` and `train_seq_len`, "
                f"got {self.alibi_scaling}"
            )
        alibi_scaling_type = self.alibi_scaling.get("type", None)
        alibi_scaling_factor = self.alibi_scaling.get("factor", None)
        alibi_dynamic_scaling = self.alibi_scaling.get("train_seq_len", None)
        if alibi_scaling_type is None or alibi_scaling_type != "linear":
            raise ValueError(
                f"`alibi_scaling`'s type field must be 'linear', got {alibi_scaling_type}"
            )
        if alibi_scaling_factor is not None:
            if not isinstance(alibi_scaling_factor, float) or alibi_scaling_factor <= 1.0:
                raise ValueError(f"`alibi_scaling`'s factor field must be a float > 1.0, got {alibi_scaling_factor}")
        if alibi_dynamic_scaling is not None:
            if not isinstance(alibi_dynamic_scaling, int) or alibi_dynamic_scaling <= 1:
                raise ValueError(f"`alibi_scaling`'s `train_seq_len` field must be an integer > 1, got {alibi_dynamic_scaling}")