123 lines
4.8 KiB
Python
123 lines
4.8 KiB
Python
# --------------------------------------------------------
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# InternVL
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# Copyright (c) 2024 OpenGVLab
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# Licensed under The MIT License [see LICENSE for details]
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# --------------------------------------------------------
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from typing import Optional, Tuple, Union
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import torch
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import torch.nn.functional as F
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import torch.utils.checkpoint
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from torch import nn
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from transformers.modeling_outputs import (
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BaseModelOutputWithPooling)
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from transformers.modeling_utils import PreTrainedModel
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from transformers.utils import logging
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from .configuration_intern_patch import InternVisionPatchConfig
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logger = logging.get_logger(__name__)
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class InternVisionEmbeddings(nn.Module):
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def __init__(self, config: InternVisionPatchConfig):
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super().__init__()
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self.config = config
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self.embed_dim = config.hidden_size
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self.image_size = config.image_size
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self.patch_size = config.patch_size
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self.class_embedding = nn.Parameter(
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torch.randn(1, 1, self.embed_dim),
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)
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self.patch_embedding = nn.Conv2d(
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in_channels=3, out_channels=self.embed_dim, kernel_size=self.patch_size, stride=self.patch_size
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)
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self.num_patches = (self.image_size // self.patch_size) ** 2
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self.num_positions = self.num_patches + 1
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self.position_embedding = nn.Parameter(torch.randn(1, self.num_positions, self.embed_dim))
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def _get_pos_embed(self, pos_embed, H, W):
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target_dtype = pos_embed.dtype
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pos_embed = pos_embed.float().reshape(
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1, self.image_size // self.patch_size, self.image_size // self.patch_size, -1).permute(0, 3, 1, 2)
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pos_embed = F.interpolate(pos_embed, size=(H, W), mode='bicubic', align_corners=False). \
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reshape(1, -1, H * W).permute(0, 2, 1).to(target_dtype)
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return pos_embed
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def forward(self, pixel_values: torch.FloatTensor) -> torch.Tensor:
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target_dtype = self.patch_embedding.weight.dtype
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patch_embeds = self.patch_embedding(pixel_values) # shape = [*, channel, width, height]
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batch_size, _, height, width = patch_embeds.shape
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patch_embeds = patch_embeds.flatten(2).transpose(1, 2)
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class_embeds = self.class_embedding.expand(batch_size, 1, -1).to(target_dtype)
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embeddings = torch.cat([class_embeds, patch_embeds], dim=1)
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position_embedding = torch.cat([
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self.position_embedding[:, :1, :],
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self._get_pos_embed(self.position_embedding[:, 1:, :], height, width)
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], dim=1)
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embeddings = embeddings + position_embedding.to(target_dtype)
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return embeddings
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class InternVisionPatchModel(PreTrainedModel):
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main_input_name = 'pixel_values'
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config_class = InternVisionPatchConfig
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_no_split_modules = ['InternVisionEncoderLayer']
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def __init__(self, config: InternVisionPatchConfig):
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super().__init__(config)
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self.config = config
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self.embeddings = InternVisionEmbeddings(config)
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def resize_pos_embeddings(self, old_size, new_size, patch_size):
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pos_emb = self.embeddings.position_embedding
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_, num_positions, embed_dim = pos_emb.shape
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cls_emb = pos_emb[:, :1, :]
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pos_emb = pos_emb[:, 1:, :].reshape(1, old_size // patch_size, old_size // patch_size, -1).permute(0, 3, 1, 2)
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pos_emb = F.interpolate(pos_emb.float(), size=new_size // patch_size, mode='bicubic', align_corners=False)
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pos_emb = pos_emb.to(cls_emb.dtype).reshape(1, embed_dim, -1).permute(0, 2, 1)
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pos_emb = torch.cat([cls_emb, pos_emb], dim=1)
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self.embeddings.position_embedding = nn.Parameter(pos_emb)
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self.embeddings.image_size = new_size
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logger.info('Resized position embeddings from {} to {}'.format(old_size, new_size))
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def get_input_embeddings(self):
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return self.embeddings
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def forward(
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self,
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pixel_values: Optional[torch.FloatTensor] = None,
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output_hidden_states: Optional[bool] = None,
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return_dict: Optional[bool] = None,
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pixel_embeds: Optional[torch.FloatTensor] = None,
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) -> Union[Tuple, BaseModelOutputWithPooling]:
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return_dict = return_dict if return_dict is not None else self.config.use_return_dict
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if pixel_values is None:
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raise ValueError('You have to specify pixel_values')
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if len(pixel_values.shape) == 4:
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hidden_states = self.embeddings(pixel_values)[:,1:]
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else:
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raise ValueError(f'wrong pixel_values size: {pixel_values.shape}')
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if not return_dict:
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return (hidden_states, None,None)
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return BaseModelOutputWithPooling(
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last_hidden_state=hidden_states,
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pooler_output=None,
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hidden_states=None,
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attentions=None,
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)
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