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from .VLMConfig import VLMConfig
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from .model import *
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from typing import Optional, Tuple, List
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from torch import nn
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import warnings
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from transformers import CLIPProcessor, CLIPModel
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import torch
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warnings.filterwarnings('ignore')
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class VisionProj(nn.Module):
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def __init__(self, ve_dim=768, lm_dim=512):
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super().__init__()
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self.ve_dim = ve_dim
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self.lm_dim = lm_dim
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self.vision_proj = nn.Sequential(
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nn.Linear(self.ve_dim, self.lm_dim)
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)
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def forward(self, image_encoders):
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vision_proj = self.vision_proj(image_encoders)
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return vision_proj
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class MiniMindVLM(MiniMindLM):
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config_class = VLMConfig
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def __init__(self, params: VLMConfig = None):
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super().__init__(params)
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if not params: params = VLMConfig()
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self.params = params
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self.vision_encoder, self.processor = self.__class__.get_vision_model()
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self.vision_proj = VisionProj(lm_dim=params.dim)
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@staticmethod
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def get_vision_model(model_path="./model/vision_model/clip-vit-base-patch16"):
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model = CLIPModel.from_pretrained(model_path)
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processor = CLIPProcessor.from_pretrained(model_path)
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for param in model.parameters():
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param.requires_grad = False
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return model.eval(), processor
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@staticmethod
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def image2tensor(image, processor):
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if image.mode in ['RGBA', 'LA']: image = image.convert('RGB')
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inputs = processor(images=image, return_tensors="pt")['pixel_values']
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return inputs
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@staticmethod
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def get_image_embeddings(image_tensors, vision_model):
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with torch.no_grad():
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outputs = vision_model.vision_model(pixel_values=image_tensors)
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img_embedding = outputs.last_hidden_state[:, 1:, :].squeeze()
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return img_embedding
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def count_vision_proj(self, tokens, h, vision_tensors=None, seqlen=512):
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def find_indices(tokens, image_ids):
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image_ids_tensor = torch.tensor(image_ids).to(tokens.device)
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len_image_ids = len(image_ids)
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if len_image_ids > tokens.size(1):
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return None
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tokens_view = tokens.unfold(1, len_image_ids, 1)
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matches = (tokens_view == image_ids_tensor).all(dim=2)
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return {
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batch_idx: [(idx.item(), idx.item() + len_image_ids - 1) for idx in
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matches[batch_idx].nonzero(as_tuple=True)[0]]
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for batch_idx in range(tokens.size(0)) if matches[batch_idx].any()
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} or None
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image_indices = find_indices(tokens, self.params.image_ids)
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if vision_tensors is not None and image_indices:
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vision_proj = self.vision_proj(vision_tensors)
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if len(vision_proj.shape) == 3:
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vision_proj = vision_proj.unsqueeze(0)
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new_h = []
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for i in range(h.size(0)):
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if i in image_indices:
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h_i = h[i]
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img_idx = 0
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for start_idx, end_idx in image_indices[i]:
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if img_idx < vision_proj.size(1):
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h_i = torch.cat((h_i[:start_idx], vision_proj[i][img_idx], h_i[end_idx + 1:]), dim=0)[
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:seqlen]
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img_idx += 1
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new_h.append(h_i)
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else:
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new_h.append(h[i])
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return torch.stack(new_h, dim=0)
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return h
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def forward(self,
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input_ids: Optional[torch.Tensor] = None,
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past_key_values: Optional[List[Tuple[torch.Tensor, torch.Tensor]]] = None,
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use_cache: bool = False,
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**args):
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start_pos = args.get('start_pos', 0)
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pixel_tensors = args.get('pixel_tensors', None)
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h = self.tok_embeddings(input_ids)
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if pixel_tensors is not None and start_pos == 0:
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if len(pixel_tensors.shape) == 6:
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pixel_tensors = pixel_tensors.squeeze(2)
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bs, num, c, im_h, im_w = pixel_tensors.shape
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stack_dim = 1 if bs > 1 else 0
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vision_tensors = torch.stack([
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MiniMindVLM.get_image_embeddings(pixel_tensors[:, i, :, :, :], self.vision_encoder)
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for i in range(num)
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], dim=stack_dim)
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h = self.count_vision_proj(tokens=input_ids, h=h, vision_tensors=vision_tensors, seqlen=input_ids.shape[1])
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pos_cis = self.pos_cis[start_pos:start_pos + input_ids.shape[1]]
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past_kvs = []
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for l, layer in enumerate(self.layers):
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h, past_kv = layer(
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h, pos_cis,
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past_key_value=past_key_values[l] if past_key_values else None,
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use_cache=use_cache
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)
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past_kvs.append(past_kv)
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logits = self.output(self.norm(h))
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aux_loss = sum(l.feed_forward.aux_loss for l in self.layers if isinstance(l.feed_forward, MOEFeedForward))
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self.OUT.__setitem__('logits', logits)
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self.OUT.__setitem__('aux_loss', aux_loss)
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self.OUT.__setitem__('past_key_values', past_kvs)
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return self.OUT
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