mirror of
https://github.com/invoke-ai/InvokeAI
synced 2024-08-30 20:32:17 +00:00
295 lines
14 KiB
Python
295 lines
14 KiB
Python
import os
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import traceback
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from typing import Optional
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import torch
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from dataclasses import dataclass
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from picklescan.scanner import scan_file_path
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from transformers import CLIPTokenizer, CLIPTextModel
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from ldm.invoke.concepts_lib import HuggingFaceConceptsLibrary
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@dataclass
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class TextualInversion:
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trigger_string: str
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embedding: torch.Tensor
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trigger_token_id: Optional[int] = None
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pad_token_ids: Optional[list[int]] = None
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@property
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def embedding_vector_length(self) -> int:
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return self.embedding.shape[0]
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class TextualInversionManager():
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def __init__(self,
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tokenizer: CLIPTokenizer,
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text_encoder: CLIPTextModel,
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full_precision: bool=True):
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self.tokenizer = tokenizer
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self.text_encoder = text_encoder
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self.full_precision = full_precision
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self.hf_concepts_library = HuggingFaceConceptsLibrary()
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default_textual_inversions: list[TextualInversion] = []
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self.textual_inversions = default_textual_inversions
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def load_huggingface_concepts(self, concepts: list[str]):
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for concept_name in concepts:
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if concept_name in self.hf_concepts_library.concepts_loaded:
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continue
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trigger = self.hf_concepts_library.concept_to_trigger(concept_name)
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if self.has_textual_inversion_for_trigger_string(trigger):
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continue
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bin_file = self.hf_concepts_library.get_concept_model_path(concept_name)
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if not bin_file:
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continue
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self.load_textual_inversion(bin_file)
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self.hf_concepts_library.concepts_loaded[concept_name]=True
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def get_all_trigger_strings(self) -> list[str]:
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return [ti.trigger_string for ti in self.textual_inversions]
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def load_textual_inversion(self, ckpt_path, defer_injecting_tokens: bool=False):
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try:
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scan_result = scan_file_path(ckpt_path)
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if scan_result.infected_files == 1:
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print(f'\n### Security Issues Found in Model: {scan_result.issues_count}')
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print('### For your safety, InvokeAI will not load this embed.')
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return
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except Exception:
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print(f"### WARNING::: Invalid or corrupt embeddings found. Ignoring: {ckpt_path}")
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return
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embedding_info = self._parse_embedding(ckpt_path)
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if embedding_info:
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try:
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self._add_textual_inversion(embedding_info['name'],
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embedding_info['embedding'],
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defer_injecting_tokens=defer_injecting_tokens)
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except ValueError as e:
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print(f' | Ignoring incompatible embedding {embedding_info["name"]}')
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print(f' | The error was {str(e)}')
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else:
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print(f'>> Failed to load embedding located at {ckpt_path}. Unsupported file.')
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def _add_textual_inversion(self, trigger_str, embedding, defer_injecting_tokens=False) -> TextualInversion:
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"""
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Add a textual inversion to be recognised.
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:param trigger_str: The trigger text in the prompt that activates this textual inversion. If unknown to the embedder's tokenizer, will be added.
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:param embedding: The actual embedding data that will be inserted into the conditioning at the point where the token_str appears.
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:return: The token id for the added embedding, either existing or newly-added.
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"""
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if trigger_str in [ti.trigger_string for ti in self.textual_inversions]:
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print(f">> TextualInversionManager refusing to overwrite already-loaded token '{trigger_str}'")
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return
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if not self.full_precision:
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embedding = embedding.half()
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if len(embedding.shape) == 1:
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embedding = embedding.unsqueeze(0)
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elif len(embedding.shape) > 2:
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raise ValueError(f"TextualInversionManager cannot add {trigger_str} because the embedding shape {embedding.shape} is incorrect. The embedding must have shape [token_dim] or [V, token_dim] where V is vector length and token_dim is 768 for SD1 or 1280 for SD2.")
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try:
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ti = TextualInversion(
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trigger_string=trigger_str,
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embedding=embedding
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)
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if not defer_injecting_tokens:
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self._inject_tokens_and_assign_embeddings(ti)
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self.textual_inversions.append(ti)
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return ti
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except ValueError as e:
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if str(e).startswith('Warning'):
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print(f">> {str(e)}")
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else:
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traceback.print_exc()
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print(f">> TextualInversionManager was unable to add a textual inversion with trigger string {trigger_str}.")
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raise
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def _inject_tokens_and_assign_embeddings(self, ti: TextualInversion) -> int:
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if ti.trigger_token_id is not None:
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raise ValueError(f"Tokens already injected for textual inversion with trigger '{ti.trigger_string}'")
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trigger_token_id = self._get_or_create_token_id_and_assign_embedding(ti.trigger_string, ti.embedding[0])
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if ti.embedding_vector_length > 1:
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# for embeddings with vector length > 1
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pad_token_strings = [ti.trigger_string + "-!pad-" + str(pad_index) for pad_index in range(1, ti.embedding_vector_length)]
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# todo: batched UI for faster loading when vector length >2
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pad_token_ids = [self._get_or_create_token_id_and_assign_embedding(pad_token_str, ti.embedding[1 + i]) \
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for (i, pad_token_str) in enumerate(pad_token_strings)]
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else:
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pad_token_ids = []
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ti.trigger_token_id = trigger_token_id
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ti.pad_token_ids = pad_token_ids
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return ti.trigger_token_id
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def has_textual_inversion_for_trigger_string(self, trigger_string: str) -> bool:
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try:
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ti = self.get_textual_inversion_for_trigger_string(trigger_string)
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return ti is not None
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except StopIteration:
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return False
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def get_textual_inversion_for_trigger_string(self, trigger_string: str) -> TextualInversion:
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return next(ti for ti in self.textual_inversions if ti.trigger_string == trigger_string)
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def get_textual_inversion_for_token_id(self, token_id: int) -> TextualInversion:
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return next(ti for ti in self.textual_inversions if ti.trigger_token_id == token_id)
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def create_deferred_token_ids_for_any_trigger_terms(self, prompt_string: str) -> list[int]:
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injected_token_ids = []
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for ti in self.textual_inversions:
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if ti.trigger_token_id is None and ti.trigger_string in prompt_string:
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if ti.embedding_vector_length > 1:
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print(f">> Preparing tokens for textual inversion {ti.trigger_string}...")
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try:
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self._inject_tokens_and_assign_embeddings(ti)
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except ValueError as e:
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print(f' | Ignoring incompatible embedding trigger {ti.trigger_string}')
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print(f' | The error was {str(e)}')
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continue
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injected_token_ids.append(ti.trigger_token_id)
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injected_token_ids.extend(ti.pad_token_ids)
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return injected_token_ids
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def expand_textual_inversion_token_ids_if_necessary(self, prompt_token_ids: list[int]) -> list[int]:
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"""
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Insert padding tokens as necessary into the passed-in list of token ids to match any textual inversions it includes.
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:param prompt_token_ids: The prompt as a list of token ids (`int`s). Should not include bos and eos markers.
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:return: The prompt token ids with any necessary padding to account for textual inversions inserted. May be too
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long - caller is responsible for prepending/appending eos and bos token ids, and truncating if necessary.
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"""
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if len(prompt_token_ids) == 0:
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return prompt_token_ids
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if prompt_token_ids[0] == self.tokenizer.bos_token_id:
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raise ValueError("prompt_token_ids must not start with bos_token_id")
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if prompt_token_ids[-1] == self.tokenizer.eos_token_id:
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raise ValueError("prompt_token_ids must not end with eos_token_id")
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textual_inversion_trigger_token_ids = [ti.trigger_token_id for ti in self.textual_inversions]
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prompt_token_ids = prompt_token_ids.copy()
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for i, token_id in reversed(list(enumerate(prompt_token_ids))):
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if token_id in textual_inversion_trigger_token_ids:
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textual_inversion = next(ti for ti in self.textual_inversions if ti.trigger_token_id == token_id)
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for pad_idx in range(0, textual_inversion.embedding_vector_length-1):
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prompt_token_ids.insert(i+pad_idx+1, textual_inversion.pad_token_ids[pad_idx])
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return prompt_token_ids
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def _get_or_create_token_id_and_assign_embedding(self, token_str: str, embedding: torch.Tensor) -> int:
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if len(embedding.shape) != 1:
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raise ValueError("Embedding has incorrect shape - must be [token_dim] where token_dim is 768 for SD1 or 1280 for SD2")
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existing_token_id = self.tokenizer.convert_tokens_to_ids(token_str)
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if existing_token_id == self.tokenizer.unk_token_id:
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num_tokens_added = self.tokenizer.add_tokens(token_str)
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current_embeddings = self.text_encoder.resize_token_embeddings(None)
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current_token_count = current_embeddings.num_embeddings
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new_token_count = current_token_count + num_tokens_added
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# the following call is slow - todo make batched for better performance with vector length >1
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self.text_encoder.resize_token_embeddings(new_token_count)
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token_id = self.tokenizer.convert_tokens_to_ids(token_str)
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if token_id == self.tokenizer.unk_token_id:
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raise RuntimeError(f"Unable to find token id for token '{token_str}'")
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if self.text_encoder.get_input_embeddings().weight.data[token_id].shape != embedding.shape:
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raise ValueError(f"Warning. Cannot load embedding for {token_str}. It was trained on a model with token dimension {embedding.shape[0]}, but the current model has token dimension {self.text_encoder.get_input_embeddings().weight.data[token_id].shape[0]}.")
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self.text_encoder.get_input_embeddings().weight.data[token_id] = embedding
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return token_id
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def _parse_embedding(self, embedding_file: str):
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file_type = embedding_file.split('.')[-1]
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if file_type == 'pt':
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return self._parse_embedding_pt(embedding_file)
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elif file_type == 'bin':
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return self._parse_embedding_bin(embedding_file)
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else:
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print(f'>> Not a recognized embedding file: {embedding_file}')
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def _parse_embedding_pt(self, embedding_file):
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embedding_ckpt = torch.load(embedding_file, map_location='cpu')
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embedding_info = {}
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# Check if valid embedding file
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if 'string_to_token' and 'string_to_param' in embedding_ckpt:
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# Catch variants that do not have the expected keys or values.
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try:
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embedding_info['name'] = embedding_ckpt['name'] or os.path.basename(os.path.splitext(embedding_file)[0])
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# Check num of embeddings and warn user only the first will be used
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embedding_info['num_of_embeddings'] = len(embedding_ckpt["string_to_token"])
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if embedding_info['num_of_embeddings'] > 1:
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print('>> More than 1 embedding found. Will use the first one')
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embedding = list(embedding_ckpt['string_to_param'].values())[0]
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except (AttributeError,KeyError):
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return self._handle_broken_pt_variants(embedding_ckpt, embedding_file)
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embedding_info['embedding'] = embedding
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embedding_info['num_vectors_per_token'] = embedding.size()[0]
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embedding_info['token_dim'] = embedding.size()[1]
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try:
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embedding_info['trained_steps'] = embedding_ckpt['step']
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embedding_info['trained_model_name'] = embedding_ckpt['sd_checkpoint_name']
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embedding_info['trained_model_checksum'] = embedding_ckpt['sd_checkpoint']
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except AttributeError:
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print(">> No Training Details Found. Passing ...")
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# .pt files found at https://cyberes.github.io/stable-diffusion-textual-inversion-models/
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# They are actually .bin files
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elif len(embedding_ckpt.keys())==1:
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print('>> Detected .bin file masquerading as .pt file')
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embedding_info = self._parse_embedding_bin(embedding_file)
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else:
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print('>> Invalid embedding format')
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embedding_info = None
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return embedding_info
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def _parse_embedding_bin(self, embedding_file):
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embedding_ckpt = torch.load(embedding_file, map_location='cpu')
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embedding_info = {}
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if list(embedding_ckpt.keys()) == 0:
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print(">> Invalid concepts file")
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embedding_info = None
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else:
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for token in list(embedding_ckpt.keys()):
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embedding_info['name'] = token or os.path.basename(os.path.splitext(embedding_file)[0])
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embedding_info['embedding'] = embedding_ckpt[token]
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embedding_info['num_vectors_per_token'] = 1 # All Concepts seem to default to 1
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embedding_info['token_dim'] = embedding_info['embedding'].size()[0]
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return embedding_info
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def _handle_broken_pt_variants(self, embedding_ckpt:dict, embedding_file:str)->dict:
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'''
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This handles the broken .pt file variants. We only know of one at present.
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'''
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embedding_info = {}
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if isinstance(list(embedding_ckpt['string_to_token'].values())[0],torch.Tensor):
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print('>> Detected .pt file variant 1') # example at https://github.com/invoke-ai/InvokeAI/issues/1829
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for token in list(embedding_ckpt['string_to_token'].keys()):
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embedding_info['name'] = token if token != '*' else os.path.basename(os.path.splitext(embedding_file)[0])
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embedding_info['embedding'] = embedding_ckpt['string_to_param'].state_dict()[token]
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embedding_info['num_vectors_per_token'] = embedding_info['embedding'].shape[0]
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embedding_info['token_dim'] = embedding_info['embedding'].size()[0]
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else:
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print('>> Invalid embedding format')
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embedding_info = None
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return embedding_info
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