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https://github.com/modelscope/DiffSynth-Studio.git
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118 lines
4.1 KiB
Python
118 lines
4.1 KiB
Python
from transformers import CLIPTokenizer
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from ..models import SDTextEncoder, SDXLTextEncoder, SDXLTextEncoder2
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import torch, os
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from safetensors import safe_open
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def tokenize_long_prompt(tokenizer, prompt):
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# Get model_max_length from self.tokenizer
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length = tokenizer.model_max_length
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# To avoid the warning. set self.tokenizer.model_max_length to +oo.
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tokenizer.model_max_length = 99999999
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# Tokenize it!
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input_ids = tokenizer(prompt, return_tensors="pt").input_ids
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# Determine the real length.
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max_length = (input_ids.shape[1] + length - 1) // length * length
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# Restore tokenizer.model_max_length
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tokenizer.model_max_length = length
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# Tokenize it again with fixed length.
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input_ids = tokenizer(
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prompt,
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return_tensors="pt",
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padding="max_length",
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max_length=max_length,
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truncation=True
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).input_ids
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# Reshape input_ids to fit the text encoder.
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num_sentence = input_ids.shape[1] // length
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input_ids = input_ids.reshape((num_sentence, length))
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return input_ids
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def load_textual_inversion(prompt):
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# TODO: This module is not enabled now.
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textual_inversion_files = os.listdir("models/textual_inversion")
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embeddings_768 = []
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embeddings_1280 = []
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for file_name in textual_inversion_files:
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if not file_name.endswith(".safetensors"):
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continue
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keyword = file_name[:-len(".safetensors")]
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if keyword in prompt:
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prompt = prompt.replace(keyword, "")
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with safe_open(f"models/textual_inversion/{file_name}", framework="pt", device="cpu") as f:
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for k in f.keys():
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embedding = f.get_tensor(k).to(torch.float32)
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if embedding.shape[-1] == 768:
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embeddings_768.append(embedding)
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elif embedding.shape[-1] == 1280:
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embeddings_1280.append(embedding)
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if len(embeddings_768)==0:
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embeddings_768 = torch.zeros((0, 768))
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else:
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embeddings_768 = torch.concat(embeddings_768, dim=0)
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if len(embeddings_1280)==0:
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embeddings_1280 = torch.zeros((0, 1280))
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else:
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embeddings_1280 = torch.concat(embeddings_1280, dim=0)
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return prompt, embeddings_768, embeddings_1280
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class SDPrompter:
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def __init__(self, tokenizer_path="configs/stable_diffusion/tokenizer"):
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# We use the tokenizer implemented by transformers
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self.tokenizer = CLIPTokenizer.from_pretrained(tokenizer_path)
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def encode_prompt(self, text_encoder: SDTextEncoder, prompt, clip_skip=1, device="cuda"):
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input_ids = tokenize_long_prompt(self.tokenizer, prompt).to(device)
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prompt_emb = text_encoder(input_ids, clip_skip=clip_skip)
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prompt_emb = prompt_emb.reshape((1, prompt_emb.shape[0]*prompt_emb.shape[1], -1))
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return prompt_emb
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class SDXLPrompter:
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def __init__(
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self,
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tokenizer_path="configs/stable_diffusion/tokenizer",
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tokenizer_2_path="configs/stable_diffusion_xl/tokenizer_2"
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):
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# We use the tokenizer implemented by transformers
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self.tokenizer = CLIPTokenizer.from_pretrained(tokenizer_path)
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self.tokenizer_2 = CLIPTokenizer.from_pretrained(tokenizer_2_path)
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def encode_prompt(
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self,
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text_encoder: SDXLTextEncoder,
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text_encoder_2: SDXLTextEncoder2,
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prompt,
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clip_skip=1,
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clip_skip_2=2,
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device="cuda"
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):
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# 1
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input_ids = tokenize_long_prompt(self.tokenizer, prompt).to(device)
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prompt_emb_1 = text_encoder(input_ids, clip_skip=clip_skip)
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# 2
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input_ids_2 = tokenize_long_prompt(self.tokenizer_2, prompt).to(device)
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add_text_embeds, prompt_emb_2 = text_encoder_2(input_ids_2, clip_skip=clip_skip_2)
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# Merge
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prompt_emb = torch.concatenate([prompt_emb_1, prompt_emb_2], dim=-1)
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# For very long prompt, we only use the first 77 tokens to compute `add_text_embeds`.
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add_text_embeds = add_text_embeds[0:1]
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prompt_emb = prompt_emb.reshape((1, prompt_emb.shape[0]*prompt_emb.shape[1], -1))
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return add_text_embeds, prompt_emb
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