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| # ------------------------------------------------------------------------------------ | |
| # Minimal DALL-E | |
| # Copyright (c) 2021 KakaoBrain. All Rights Reserved. | |
| # Licensed under the Apache License, Version 2.0 [see LICENSE for details] | |
| # ------------------------------------------------------------------------------------ | |
| # Modified from minGPT (https://github.com/karpathy/minGPT) | |
| # Copyright (c) 2020 Andrej Karpathy. All Rights Reserved. | |
| # ------------------------------------------------------------------------------------ | |
| import torch | |
| import torch.nn as nn | |
| from typing import Optional, Tuple, List | |
| from torch.cuda.amp import autocast | |
| from omegaconf import OmegaConf | |
| from .layers import Block | |
| class Transformer1d(nn.Module): | |
| def __init__(self, | |
| vocab_size_txt: int, | |
| vocab_size_img: int, | |
| hparams: OmegaConf) -> None: | |
| super().__init__() | |
| assert hparams.n_layers == hparams.n_dense_layers | |
| # input embedding for image and text | |
| self.tok_emb_img = nn.Embedding(vocab_size_img, hparams.embed_dim) | |
| self.tok_emb_txt = nn.Embedding(vocab_size_txt, hparams.embed_dim) | |
| self.pos_emb_img = nn.Embedding(hparams.ctx_len_img, hparams.embed_dim) | |
| self.pos_emb_txt = nn.Embedding(hparams.ctx_len_txt, hparams.embed_dim) | |
| self.drop = nn.Dropout(hparams.embd_pdrop) | |
| # transformer blocks | |
| self.blocks = [Block(ctx_len=hparams.ctx_len_img + hparams.ctx_len_txt, | |
| embed_dim=hparams.embed_dim, | |
| n_heads=hparams.n_heads, | |
| mlp_bias=hparams.mlp_bias, | |
| attn_bias=hparams.attn_bias, | |
| resid_pdrop=hparams.resid_pdrop, | |
| attn_pdrop=hparams.attn_pdrop, | |
| gelu_use_approx=hparams.gelu_use_approx) for i in range(1, hparams.n_layers+1)] | |
| self.blocks = nn.Sequential(*self.blocks) | |
| # heads for image and text | |
| self.ln_f = nn.LayerNorm(hparams.embed_dim) | |
| self.head_img = nn.Linear(hparams.embed_dim, vocab_size_img, bias=False) | |
| self.head_txt = nn.Linear(hparams.embed_dim, vocab_size_txt, bias=False) | |
| self.ctx_len_img = hparams.ctx_len_img | |
| self.ctx_len_txt = hparams.ctx_len_txt | |
| self.n_layers = hparams.n_layers | |
| self.apply(self._init_weights) | |
| def _init_weights(self, module: nn.Module) -> None: | |
| if isinstance(module, (nn.Linear, nn.Embedding)): | |
| module.weight.data.normal_(mean=0.0, std=0.02) | |
| if isinstance(module, nn.Linear) and module.bias is not None: | |
| module.bias.data.zero_() | |
| elif isinstance(module, nn.LayerNorm): | |
| module.bias.data.zero_() | |
| module.weight.data.fill_(1.0) | |
| def forward(self, | |
| images: torch.LongTensor, | |
| texts: torch.LongTensor, | |
| pos_images: torch.LongTensor, | |
| pos_texts: torch.LongTensor) -> Tuple[torch.FloatTensor, torch.FloatTensor]: | |
| B, T = images.shape | |
| _, N = texts.shape | |
| assert T <= self.ctx_len_img, "Already reached the maximum context length (image)." | |
| assert N == self.ctx_len_txt, "Already reached the maximum context length (text)." | |
| texts = self.tok_emb_txt(texts) | |
| images = self.tok_emb_img(images) | |
| texts = texts + self.pos_emb_txt(pos_texts) | |
| images = images + self.pos_emb_img(pos_images) | |
| x = torch.cat([texts, images], axis=1).contiguous() | |
| x = self.drop(x) | |
| x = self.blocks(x) | |
| x = self.ln_f(x) | |
| texts = x[:, :N-1].contiguous() | |
| images = x[:, N-1:-1].contiguous() | |
| logits_txt = self.head_txt(texts) | |
| logits_img = self.head_img(images) | |
| return logits_img, logits_txt | |
| def sampling(self, | |
| images: torch.LongTensor, | |
| texts: torch.LongTensor, | |
| pos_images: torch.LongTensor, | |
| pos_texts: torch.LongTensor, | |
| use_fp16: bool = True, | |
| past: Optional[List[torch.Tensor]] = None) -> Tuple[torch.FloatTensor, List[torch.FloatTensor]]: | |
| _, N = texts.shape | |
| assert N == self.ctx_len_txt, "Already reached the maximum context length (text)." | |
| with autocast(enabled=use_fp16): | |
| if images is None: | |
| assert past is None | |
| texts = self.tok_emb_txt(texts) | |
| x = texts + self.pos_emb_txt(pos_texts) | |
| x = self.drop(x) | |
| presents = [] | |
| for i, block in enumerate(self.blocks): | |
| x, present = block.sample(x, layer_past=None) | |
| presents.append(present) | |
| x = self.ln_f(x) | |
| x = x[:, N-1].contiguous() | |
| logits = self.head_img(x) | |
| else: | |
| if past is None: | |
| texts = self.tok_emb_txt(texts) | |
| images = self.tok_emb_img(images) | |
| texts = texts + self.pos_emb_txt(pos_texts) | |
| images = images + self.pos_emb_img(pos_images) | |
| x = torch.cat([texts, images], axis=1).contiguous() | |
| else: | |
| images = self.tok_emb_img(images) | |
| x = images + self.pos_emb_img(pos_images) | |
| x = self.drop(x) | |
| if past is not None: | |
| past = torch.cat(past, dim=-2) | |
| presents = [] | |
| for i, block in enumerate(self.blocks): | |
| x, present = block.sample(x, layer_past=None if past is None else past[i]) | |
| presents.append(present) | |
| x = self.ln_f(x) | |
| x = x[:, -1].contiguous() | |
| logits = self.head_img(x) | |
| return logits, presents | |
| def from_ckpt(self, path: str) -> None: | |
| ckpt = torch.load(path, map_location='cpu')['state_dict'] | |
| self.load_state_dict(ckpt, strict=True) | |
| print(f'{path} succesfully restored..') | |
| class iGPT(nn.Module): | |
| def __init__(self, | |
| vocab_size_img: int, | |
| use_cls_cond: bool, | |
| hparams: OmegaConf) -> None: | |
| super().__init__() | |
| self.use_cls_cond = use_cls_cond | |
| # sos token embedding | |
| if self.use_cls_cond: | |
| self.sos = nn.Embedding(hparams.n_classes, hparams.embed_dim) | |
| else: | |
| self.sos = nn.Parameter(torch.randn(1, 1, hparams.embed_dim)) | |
| # input embedding | |
| self.tok_emb_img = nn.Embedding(vocab_size_img, hparams.embed_dim) | |
| self.pos_emb_img = nn.Embedding(hparams.ctx_len_img, hparams.embed_dim) | |
| self.drop = nn.Dropout(hparams.embd_pdrop) | |
| # transformer blocks | |
| self.blocks = [Block(ctx_len=hparams.ctx_len_img + 1, | |
| embed_dim=hparams.embed_dim, | |
| n_heads=hparams.n_heads, | |
| mlp_bias=hparams.mlp_bias, | |
| attn_bias=hparams.attn_bias, | |
| resid_pdrop=hparams.resid_pdrop, | |
| attn_pdrop=hparams.attn_pdrop, | |
| gelu_use_approx=hparams.gelu_use_approx) for i in range(1, hparams.n_layers+1)] | |
| self.blocks = nn.Sequential(*self.blocks) | |
| # head | |
| self.ln_f = nn.LayerNorm(hparams.embed_dim) | |
| self.head = nn.Linear(hparams.embed_dim, vocab_size_img, bias=False) | |
| self.ctx_len_img = hparams.ctx_len_img | |
| self.n_layers = hparams.n_layers | |
| self.apply(self._init_weights) | |
| def _init_weights(self, module: nn.Module) -> None: | |
| if isinstance(module, (nn.Linear, nn.Embedding)): | |
| module.weight.data.normal_(mean=0.0, std=0.02) | |
| if isinstance(module, nn.Linear) and module.bias is not None: | |
| module.bias.data.zero_() | |
| elif isinstance(module, nn.LayerNorm): | |
| module.bias.data.zero_() | |
| module.weight.data.fill_(1.0) | |
| def sampling(self, | |
| sos: torch.FloatTensor, | |
| codes: torch.LongTensor, | |
| pos_codes: torch.LongTensor, | |
| n_samples: int = 16, | |
| use_fp16: bool = True, | |
| past: Optional[torch.Tensor] = None) -> Tuple[torch.FloatTensor, List[torch.FloatTensor]]: | |
| with autocast(enabled=use_fp16): | |
| if codes is None: | |
| assert past is None | |
| xs = self.drop(sos) | |
| presents = [] | |
| for i, block in enumerate(self.blocks): | |
| xs, present = block.sample(xs, layer_past=None) | |
| presents.append(present) | |
| xs = self.ln_f(xs) | |
| logits = self.head(xs)[:, -1] | |
| else: | |
| if past is None: | |
| xs = self.tok_emb_img(codes) + self.pos_emb_img(pos_codes) | |
| xs = torch.cat([sos, xs], dim=1) | |
| else: | |
| xs = self.tok_emb_img(codes) + self.pos_emb_img(pos_codes) | |
| xs = self.drop(xs) | |
| past = torch.cat(past, dim=-2) if past is not None else past | |
| presents = [] | |
| for i, block in enumerate(self.blocks): | |
| xs, present = block.sample(xs, layer_past=None if past is None else past[i]) | |
| presents.append(present) | |
| xs = self.ln_f(xs) | |
| logits = self.head(xs)[:, -1] | |
| return logits, presents | |
| def forward(self, | |
| codes: torch.LongTensor, | |
| labels: Optional[torch.LongTensor] = None) -> torch.FloatTensor: | |
| B, T = codes.shape | |
| xps = torch.arange(T, device=codes.device).repeat((B, 1)) | |
| sos = self.sos.repeat((B, 1, 1)) if labels is None else self.sos(labels).unsqueeze(1) | |
| h = self.tok_emb_img(codes) + self.pos_emb_img(xps) | |
| h = torch.cat([sos, h[:, :-1]], dim=1).contiguous() | |
| h = self.drop(h) | |
| h = self.blocks(h) | |
| h = self.ln_f(h) | |
| logits = self.head(h) | |
| return logits | |
| def from_ckpt(self, path: str, strict: bool = True) -> None: | |
| ckpt = torch.load(path, map_location='cpu')['state_dict'] | |
| self.load_state_dict(ckpt, strict=strict) | |
| print(f'{path} successfully restored..') | |