diff options
Diffstat (limited to 'modules/sd_hijack_clip.py')
| -rw-r--r-- | modules/sd_hijack_clip.py | 303 |
1 files changed, 303 insertions, 0 deletions
diff --git a/modules/sd_hijack_clip.py b/modules/sd_hijack_clip.py new file mode 100644 index 00000000..ca92b142 --- /dev/null +++ b/modules/sd_hijack_clip.py @@ -0,0 +1,303 @@ +import math
+
+import torch
+
+from modules import prompt_parser, devices
+from modules.shared import opts
+
+def get_target_prompt_token_count(token_count):
+ return math.ceil(max(token_count, 1) / 75) * 75
+
+
+class FrozenCLIPEmbedderWithCustomWordsBase(torch.nn.Module):
+ def __init__(self, wrapped, hijack):
+ super().__init__()
+ self.wrapped = wrapped
+ self.hijack = hijack
+
+ def tokenize(self, texts):
+ raise NotImplementedError
+
+ def encode_with_transformers(self, tokens):
+ raise NotImplementedError
+
+ def encode_embedding_init_text(self, init_text, nvpt):
+ raise NotImplementedError
+
+ def tokenize_line(self, line, used_custom_terms, hijack_comments):
+ if opts.enable_emphasis:
+ parsed = prompt_parser.parse_prompt_attention(line)
+ else:
+ parsed = [[line, 1.0]]
+
+ tokenized = self.tokenize([text for text, _ in parsed])
+
+ fixes = []
+ remade_tokens = []
+ multipliers = []
+ last_comma = -1
+
+ for tokens, (text, weight) in zip(tokenized, parsed):
+ i = 0
+ while i < len(tokens):
+ token = tokens[i]
+
+ embedding, embedding_length_in_tokens = self.hijack.embedding_db.find_embedding_at_position(tokens, i)
+
+ if token == self.comma_token:
+ last_comma = len(remade_tokens)
+ elif opts.comma_padding_backtrack != 0 and max(len(remade_tokens), 1) % 75 == 0 and last_comma != -1 and len(remade_tokens) - last_comma <= opts.comma_padding_backtrack:
+ last_comma += 1
+ reloc_tokens = remade_tokens[last_comma:]
+ reloc_mults = multipliers[last_comma:]
+
+ remade_tokens = remade_tokens[:last_comma]
+ length = len(remade_tokens)
+
+ rem = int(math.ceil(length / 75)) * 75 - length
+ remade_tokens += [self.id_end] * rem + reloc_tokens
+ multipliers = multipliers[:last_comma] + [1.0] * rem + reloc_mults
+
+ if embedding is None:
+ remade_tokens.append(token)
+ multipliers.append(weight)
+ i += 1
+ else:
+ emb_len = int(embedding.vec.shape[0])
+ iteration = len(remade_tokens) // 75
+ if (len(remade_tokens) + emb_len) // 75 != iteration:
+ rem = (75 * (iteration + 1) - len(remade_tokens))
+ remade_tokens += [self.id_end] * rem
+ multipliers += [1.0] * rem
+ iteration += 1
+ fixes.append((iteration, (len(remade_tokens) % 75, embedding)))
+ remade_tokens += [0] * emb_len
+ multipliers += [weight] * emb_len
+ used_custom_terms.append((embedding.name, embedding.checksum()))
+ i += embedding_length_in_tokens
+
+ token_count = len(remade_tokens)
+ prompt_target_length = get_target_prompt_token_count(token_count)
+ tokens_to_add = prompt_target_length - len(remade_tokens)
+
+ remade_tokens = remade_tokens + [self.id_end] * tokens_to_add
+ multipliers = multipliers + [1.0] * tokens_to_add
+
+ return remade_tokens, fixes, multipliers, token_count
+
+ def process_text(self, texts):
+ used_custom_terms = []
+ remade_batch_tokens = []
+ hijack_comments = []
+ hijack_fixes = []
+ token_count = 0
+
+ cache = {}
+ batch_multipliers = []
+ for line in texts:
+ if line in cache:
+ remade_tokens, fixes, multipliers = cache[line]
+ else:
+ remade_tokens, fixes, multipliers, current_token_count = self.tokenize_line(line, used_custom_terms, hijack_comments)
+ token_count = max(current_token_count, token_count)
+
+ cache[line] = (remade_tokens, fixes, multipliers)
+
+ remade_batch_tokens.append(remade_tokens)
+ hijack_fixes.append(fixes)
+ batch_multipliers.append(multipliers)
+
+ return batch_multipliers, remade_batch_tokens, used_custom_terms, hijack_comments, hijack_fixes, token_count
+
+ def process_text_old(self, texts):
+ id_start = self.id_start
+ id_end = self.id_end
+ maxlen = self.wrapped.max_length # you get to stay at 77
+ used_custom_terms = []
+ remade_batch_tokens = []
+ hijack_comments = []
+ hijack_fixes = []
+ token_count = 0
+
+ cache = {}
+ batch_tokens = self.tokenize(texts)
+ batch_multipliers = []
+ for tokens in batch_tokens:
+ tuple_tokens = tuple(tokens)
+
+ if tuple_tokens in cache:
+ remade_tokens, fixes, multipliers = cache[tuple_tokens]
+ else:
+ fixes = []
+ remade_tokens = []
+ multipliers = []
+ mult = 1.0
+
+ i = 0
+ while i < len(tokens):
+ token = tokens[i]
+
+ embedding, embedding_length_in_tokens = self.hijack.embedding_db.find_embedding_at_position(tokens, i)
+
+ mult_change = self.token_mults.get(token) if opts.enable_emphasis else None
+ if mult_change is not None:
+ mult *= mult_change
+ i += 1
+ elif embedding is None:
+ remade_tokens.append(token)
+ multipliers.append(mult)
+ i += 1
+ else:
+ emb_len = int(embedding.vec.shape[0])
+ fixes.append((len(remade_tokens), embedding))
+ remade_tokens += [0] * emb_len
+ multipliers += [mult] * emb_len
+ used_custom_terms.append((embedding.name, embedding.checksum()))
+ i += embedding_length_in_tokens
+
+ if len(remade_tokens) > maxlen - 2:
+ vocab = {v: k for k, v in self.wrapped.tokenizer.get_vocab().items()}
+ ovf = remade_tokens[maxlen - 2:]
+ overflowing_words = [vocab.get(int(x), "") for x in ovf]
+ overflowing_text = self.wrapped.tokenizer.convert_tokens_to_string(''.join(overflowing_words))
+ hijack_comments.append(f"Warning: too many input tokens; some ({len(overflowing_words)}) have been truncated:\n{overflowing_text}\n")
+
+ token_count = len(remade_tokens)
+ remade_tokens = remade_tokens + [id_end] * (maxlen - 2 - len(remade_tokens))
+ remade_tokens = [id_start] + remade_tokens[0:maxlen - 2] + [id_end]
+ cache[tuple_tokens] = (remade_tokens, fixes, multipliers)
+
+ multipliers = multipliers + [1.0] * (maxlen - 2 - len(multipliers))
+ multipliers = [1.0] + multipliers[0:maxlen - 2] + [1.0]
+
+ remade_batch_tokens.append(remade_tokens)
+ hijack_fixes.append(fixes)
+ batch_multipliers.append(multipliers)
+ return batch_multipliers, remade_batch_tokens, used_custom_terms, hijack_comments, hijack_fixes, token_count
+
+ def forward(self, text):
+ use_old = opts.use_old_emphasis_implementation
+ if use_old:
+ batch_multipliers, remade_batch_tokens, used_custom_terms, hijack_comments, hijack_fixes, token_count = self.process_text_old(text)
+ else:
+ batch_multipliers, remade_batch_tokens, used_custom_terms, hijack_comments, hijack_fixes, token_count = self.process_text(text)
+
+ self.hijack.comments += hijack_comments
+
+ if len(used_custom_terms) > 0:
+ self.hijack.comments.append("Used embeddings: " + ", ".join([f'{word} [{checksum}]' for word, checksum in used_custom_terms]))
+
+ if use_old:
+ self.hijack.fixes = hijack_fixes
+ return self.process_tokens(remade_batch_tokens, batch_multipliers)
+
+ z = None
+ i = 0
+ while max(map(len, remade_batch_tokens)) != 0:
+ rem_tokens = [x[75:] for x in remade_batch_tokens]
+ rem_multipliers = [x[75:] for x in batch_multipliers]
+
+ self.hijack.fixes = []
+ for unfiltered in hijack_fixes:
+ fixes = []
+ for fix in unfiltered:
+ if fix[0] == i:
+ fixes.append(fix[1])
+ self.hijack.fixes.append(fixes)
+
+ tokens = []
+ multipliers = []
+ for j in range(len(remade_batch_tokens)):
+ if len(remade_batch_tokens[j]) > 0:
+ tokens.append(remade_batch_tokens[j][:75])
+ multipliers.append(batch_multipliers[j][:75])
+ else:
+ tokens.append([self.id_end] * 75)
+ multipliers.append([1.0] * 75)
+
+ z1 = self.process_tokens(tokens, multipliers)
+ z = z1 if z is None else torch.cat((z, z1), axis=-2)
+
+ remade_batch_tokens = rem_tokens
+ batch_multipliers = rem_multipliers
+ i += 1
+
+ return z
+
+ def process_tokens(self, remade_batch_tokens, batch_multipliers):
+ if not opts.use_old_emphasis_implementation:
+ remade_batch_tokens = [[self.id_start] + x[:75] + [self.id_end] for x in remade_batch_tokens]
+ batch_multipliers = [[1.0] + x[:75] + [1.0] for x in batch_multipliers]
+
+ tokens = torch.asarray(remade_batch_tokens).to(devices.device)
+
+ if self.id_end != self.id_pad:
+ for batch_pos in range(len(remade_batch_tokens)):
+ index = remade_batch_tokens[batch_pos].index(self.id_end)
+ tokens[batch_pos, index+1:tokens.shape[1]] = self.id_pad
+
+ z = self.encode_with_transformers(tokens)
+
+ # restoring original mean is likely not correct, but it seems to work well to prevent artifacts that happen otherwise
+ batch_multipliers_of_same_length = [x + [1.0] * (75 - len(x)) for x in batch_multipliers]
+ batch_multipliers = torch.asarray(batch_multipliers_of_same_length).to(devices.device)
+ original_mean = z.mean()
+ z *= batch_multipliers.reshape(batch_multipliers.shape + (1,)).expand(z.shape)
+ new_mean = z.mean()
+ z *= original_mean / new_mean
+
+ return z
+
+
+class FrozenCLIPEmbedderWithCustomWords(FrozenCLIPEmbedderWithCustomWordsBase):
+ def __init__(self, wrapped, hijack):
+ super().__init__(wrapped, hijack)
+ self.tokenizer = wrapped.tokenizer
+
+ vocab = self.tokenizer.get_vocab()
+
+ self.comma_token = vocab.get(',</w>', None)
+
+ self.token_mults = {}
+ tokens_with_parens = [(k, v) for k, v in vocab.items() if '(' in k or ')' in k or '[' in k or ']' in k]
+ for text, ident in tokens_with_parens:
+ mult = 1.0
+ for c in text:
+ if c == '[':
+ mult /= 1.1
+ if c == ']':
+ mult *= 1.1
+ if c == '(':
+ mult *= 1.1
+ if c == ')':
+ mult /= 1.1
+
+ if mult != 1.0:
+ self.token_mults[ident] = mult
+
+ self.id_start = self.wrapped.tokenizer.bos_token_id
+ self.id_end = self.wrapped.tokenizer.eos_token_id
+ self.id_pad = self.id_end
+
+ def tokenize(self, texts):
+ tokenized = self.wrapped.tokenizer(texts, truncation=False, add_special_tokens=False)["input_ids"]
+
+ return tokenized
+
+ def encode_with_transformers(self, tokens):
+ outputs = self.wrapped.transformer(input_ids=tokens, output_hidden_states=-opts.CLIP_stop_at_last_layers)
+
+ if opts.CLIP_stop_at_last_layers > 1:
+ z = outputs.hidden_states[-opts.CLIP_stop_at_last_layers]
+ z = self.wrapped.transformer.text_model.final_layer_norm(z)
+ else:
+ z = outputs.last_hidden_state
+
+ return z
+
+ def encode_embedding_init_text(self, init_text, nvpt):
+ embedding_layer = self.wrapped.transformer.text_model.embeddings
+ ids = self.wrapped.tokenizer(init_text, max_length=nvpt, return_tensors="pt", add_special_tokens=False)["input_ids"]
+ embedded = embedding_layer.token_embedding.wrapped(ids.to(embedding_layer.token_embedding.wrapped.weight.device)).squeeze(0)
+
+ return embedded
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