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| from torch import Tensor, nn | |
| class NewTokenEmb(nn.Module): | |
| """ | |
| For adding new tokens to a pretrained model | |
| """ | |
| def __init__(self, | |
| old_embeddings: nn.Embedding, | |
| new_num_tokens: int = None) -> None: | |
| super().__init__() | |
| self.num_tokens = old_embeddings.num_embeddings + new_num_tokens | |
| self.old_num_tokens = old_embeddings.num_embeddings | |
| self.new_num_tokens = new_num_tokens | |
| self.embedding_dim = old_embeddings.embedding_dim | |
| # For text embeddings | |
| self.text_embeddings = nn.Embedding( | |
| self.num_tokens, | |
| self.embedding_dim, | |
| device=old_embeddings.weight.device, | |
| dtype=old_embeddings.weight.dtype) | |
| with torch.no_grad(): | |
| self.text_embeddings.weight.data[:old_embeddings. | |
| num_embeddings] = old_embeddings.weight.data | |
| self.text_embeddings.weight.data[ | |
| self.old_num_tokens:] = torch.zeros( | |
| self.new_num_tokens, | |
| self.embedding_dim, | |
| dtype=old_embeddings.weight.dtype, | |
| device=old_embeddings.weight.device) | |
| self.text_embeddings.weight.requires_grad_(False) | |
| # For motion embeddings | |
| self.motion_embeddings = nn.Embedding( | |
| new_num_tokens, | |
| self.embedding_dim, | |
| device=old_embeddings.weight.device, | |
| dtype=old_embeddings.weight.dtype) | |
| with torch.no_grad(): | |
| self.motion_embeddings.weight.data[:self. | |
| old_num_tokens] = torch.zeros( | |
| new_num_tokens, | |
| self.embedding_dim, | |
| dtype=old_embeddings.weight. | |
| dtype, | |
| device=old_embeddings. | |
| weight.device) | |
| self.word2motionProj = nn.Linear(self.old_num_tokens, new_num_tokens) | |
| def forward(self, input: Tensor) -> Tensor: | |
| with torch.no_grad(): | |
| self.motion_embeddings.weight.data[:self. | |
| old_num_tokens] = torch.zeros( | |
| self.new_num_tokens, | |
| self.embedding_dim, | |
| dtype=self.motion_embeddings | |
| .weight.dtype, | |
| device=self. | |
| motion_embeddings.weight. | |
| device) | |
| self.motion_embeddings.weight.data[ | |
| self.old_num_tokens:] = self.word2motionProj( | |
| self.text_embeddings.weight.data[:self.old_num_tokens].permute( | |
| 1, 0)).permute(1, 0) | |
| return self.text_embeddings(input) + self.motion_embeddings(input) | |