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configuration_trocr.py
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configuration_trocr.py
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# coding=utf-8
# Copyright 2021 The HuggingFace Inc. team. All rights reserved.
#
# 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.
""" TrOCR model configuration"""
from ...configuration_utils import PretrainedConfig
from ...utils import logging
logger = logging.get_logger(__name__)
TROCR_PRETRAINED_CONFIG_ARCHIVE_MAP = {
"microsoft/trocr-base-handwritten": (
"https://huggingface.co/microsoft/trocr-base-handwritten/resolve/main/config.json"
),
# See all TrOCR models at https://huggingface.co/models?filter=trocr
}
class TrOCRConfig(PretrainedConfig):
r"""
This is the configuration class to store the configuration of a [`TrOCRForCausalLM`]. It is used to instantiate an
TrOCR 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 TrOCR
[microsoft/trocr-base-handwritten](https://huggingface.co/microsoft/trocr-base-handwritten) 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 50265):
Vocabulary size of the TrOCR model. Defines the number of different tokens that can be represented by the
`inputs_ids` passed when calling [`TrOCRForCausalLM`].
d_model (`int`, *optional*, defaults to 1024):
Dimensionality of the layers and the pooler layer.
decoder_layers (`int`, *optional*, defaults to 12):
Number of decoder layers.
decoder_attention_heads (`int`, *optional*, defaults to 16):
Number of attention heads for each attention layer in the Transformer decoder.
decoder_ffn_dim (`int`, *optional*, defaults to 4096):
Dimensionality of the "intermediate" (often named feed-forward) layer in decoder.
activation_function (`str` or `function`, *optional*, defaults to `"gelu"`):
The non-linear activation function (function or string) in the pooler. If string, `"gelu"`, `"relu"`,
`"silu"` and `"gelu_new"` are supported.
max_position_embeddings (`int`, *optional*, defaults to 512):
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).
dropout (`float`, *optional*, defaults to 0.1):
The dropout probability for all fully connected layers in the embeddings, and pooler.
attention_dropout (`float`, *optional*, defaults to 0.0):
The dropout ratio for the attention probabilities.
activation_dropout (`float`, *optional*, defaults to 0.0):
The dropout ratio for activations inside the fully connected layer.
init_std (`float`, *optional*, defaults to 0.02):
The standard deviation of the truncated_normal_initializer for initializing all weight matrices.
decoder_layerdrop (`float`, *optional*, defaults to 0.0):
The LayerDrop probability for the decoder. See the [LayerDrop paper](see https://arxiv.org/abs/1909.11556)
for more details.
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_embedding (`bool`, *optional*, defaults to `False`):
Whether or not to scale the word embeddings by sqrt(d_model).
use_learned_position_embeddings (`bool`, *optional*, defaults to `True`):
Whether or not to use learned position embeddings. If not, sinusoidal position embeddings will be used.
layernorm_embedding (`bool`, *optional*, defaults to `True`):
Whether or not to use a layernorm after the word + position embeddings.
Example:
```python
>>> from transformers import TrOCRConfig, TrOCRForCausalLM
>>> # Initializing a TrOCR-base style configuration
>>> configuration = TrOCRConfig()
>>> # Initializing a model (with random weights) from the TrOCR-base style configuration
>>> model = TrOCRForCausalLM(configuration)
>>> # Accessing the model configuration
>>> configuration = model.config
```"""
model_type = "trocr"
keys_to_ignore_at_inference = ["past_key_values"]
attribute_map = {
"num_attention_heads": "decoder_attention_heads",
"hidden_size": "d_model",
"num_hidden_layers": "decoder_layers",
}
def __init__(
self,
vocab_size=50265,
d_model=1024,
decoder_layers=12,
decoder_attention_heads=16,
decoder_ffn_dim=4096,
activation_function="gelu",
max_position_embeddings=512,
dropout=0.1,
attention_dropout=0.0,
activation_dropout=0.0,
decoder_start_token_id=2,
init_std=0.02,
decoder_layerdrop=0.0,
use_cache=True,
scale_embedding=False,
use_learned_position_embeddings=True,
layernorm_embedding=True,
pad_token_id=1,
bos_token_id=0,
eos_token_id=2,
**kwargs,
):
self.vocab_size = vocab_size
self.d_model = d_model
self.decoder_layers = decoder_layers
self.decoder_attention_heads = decoder_attention_heads
self.decoder_ffn_dim = decoder_ffn_dim
self.activation_function = activation_function
self.max_position_embeddings = max_position_embeddings
self.dropout = dropout
self.attention_dropout = attention_dropout
self.activation_dropout = activation_dropout
self.init_std = init_std
self.decoder_layerdrop = decoder_layerdrop
self.use_cache = use_cache
self.scale_embedding = scale_embedding
self.use_learned_position_embeddings = use_learned_position_embeddings
self.layernorm_embedding = layernorm_embedding
super().__init__(
pad_token_id=pad_token_id,
bos_token_id=bos_token_id,
eos_token_id=eos_token_id,
decoder_start_token_id=decoder_start_token_id,
**kwargs,
)