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| # -*- coding: utf-8 -*- | |
| import torch | |
| from torch import nn | |
| from einops import rearrange | |
| from transformers import CLIPModel | |
| from michelangelo.models.tsal.tsal_base import AlignedShapeAsLatentModule | |
| class CLIPAlignedShapeAsLatentModule(AlignedShapeAsLatentModule): | |
| def __init__(self, *, | |
| shape_model, | |
| clip_model_version: str = "openai/clip-vit-large-patch14"): | |
| super().__init__() | |
| self.clip_model: CLIPModel = CLIPModel.from_pretrained(clip_model_version) | |
| for params in self.clip_model.parameters(): | |
| params.requires_grad = False | |
| self.shape_model = shape_model | |
| self.shape_projection = nn.Parameter(torch.empty(self.shape_model.width, self.clip_model.projection_dim)) | |
| nn.init.normal_(self.shape_projection, std=self.clip_model.projection_dim ** -0.5) | |
| def set_shape_model_only(self): | |
| self.clip_model = None | |
| def encode_shape_embed(self, surface, return_latents: bool = False): | |
| """ | |
| Args: | |
| surface (torch.FloatTensor): [bs, n, 3 + c] | |
| return_latents (bool): | |
| Returns: | |
| x (torch.FloatTensor): [bs, projection_dim] | |
| shape_latents (torch.FloatTensor): [bs, m, d] | |
| """ | |
| pc = surface[..., 0:3] | |
| feats = surface[..., 3:] | |
| shape_embed, shape_latents = self.shape_model.encode_latents(pc, feats) | |
| x = shape_embed @ self.shape_projection | |
| if return_latents: | |
| return x, shape_latents | |
| else: | |
| return x | |
| def encode_image_embed(self, image): | |
| """ | |
| Args: | |
| image (torch.FloatTensor): [bs, 3, h, w] | |
| Returns: | |
| x (torch.FloatTensor): [bs, projection_dim] | |
| """ | |
| x = self.clip_model.get_image_features(image) | |
| return x | |
| def encode_text_embed(self, text): | |
| x = self.clip_model.get_text_features(text) | |
| return x | |
| def forward(self, surface, image, text): | |
| """ | |
| Args: | |
| surface (torch.FloatTensor): | |
| image (torch.FloatTensor): [bs, 3, 224, 224] | |
| text (torch.LongTensor): [bs, num_templates, 77] | |
| Returns: | |
| embed_outputs (dict): the embedding outputs, and it contains: | |
| - image_embed (torch.FloatTensor): | |
| - text_embed (torch.FloatTensor): | |
| - shape_embed (torch.FloatTensor): | |
| - logit_scale (float): | |
| """ | |
| # # text embedding | |
| # text_embed_all = [] | |
| # for i in range(text.shape[0]): | |
| # text_for_one_sample = text[i] | |
| # text_embed = self.encode_text_embed(text_for_one_sample) | |
| # text_embed = text_embed / text_embed.norm(dim=-1, keepdim=True) | |
| # text_embed = text_embed.mean(dim=0) | |
| # text_embed = text_embed / text_embed.norm(dim=-1, keepdim=True) | |
| # text_embed_all.append(text_embed) | |
| # text_embed_all = torch.stack(text_embed_all) | |
| b = text.shape[0] | |
| text_tokens = rearrange(text, "b t l -> (b t) l") | |
| text_embed = self.encode_text_embed(text_tokens) | |
| text_embed = rearrange(text_embed, "(b t) d -> b t d", b=b) | |
| text_embed = text_embed.mean(dim=1) | |
| text_embed = text_embed / text_embed.norm(dim=-1, keepdim=True) | |
| # image embedding | |
| image_embed = self.encode_image_embed(image) | |
| # shape embedding | |
| shape_embed, shape_latents = self.encode_shape_embed(surface, return_latents=True) | |
| embed_outputs = { | |
| "image_embed": image_embed, | |
| "text_embed": text_embed, | |
| "shape_embed": shape_embed, | |
| "logit_scale": self.clip_model.logit_scale.exp() | |
| } | |
| return embed_outputs, shape_latents | |