support CogVideoX-5B (#184)

* support cogvideo

* update examples

diffsynth/prompters/__init__.py

@@ -5,3 +5,4 @@ from .sd3_prompter import SD3Prompter
 from .hunyuan_dit_prompter import HunyuanDiTPrompter
 from .kolors_prompter import KolorsPrompter
 from .flux_prompter import FluxPrompter
+from .cog_prompter import CogPrompter

diffsynth/prompters/cog_prompter.py

@@ -0,0 +1,46 @@
+from .base_prompter import BasePrompter
+from ..models.flux_text_encoder import FluxTextEncoder2
+from transformers import T5TokenizerFast
+import os
+
+
+class CogPrompter(BasePrompter):
+    def __init__(
+        self,
+        tokenizer_path=None
+    ):
+        if tokenizer_path is None:
+            base_path = os.path.dirname(os.path.dirname(__file__))
+            tokenizer_path = os.path.join(base_path, "tokenizer_configs/cog/tokenizer")
+        super().__init__()
+        self.tokenizer = T5TokenizerFast.from_pretrained(tokenizer_path)
+        self.text_encoder: FluxTextEncoder2 = None
+
+
+    def fetch_models(self, text_encoder: FluxTextEncoder2 = None):
+        self.text_encoder = text_encoder
+
+
+    def encode_prompt_using_t5(self, prompt, text_encoder, tokenizer, max_length, device):
+        input_ids = tokenizer(
+            prompt,
+            return_tensors="pt",
+            padding="max_length",
+            max_length=max_length,
+            truncation=True,
+        ).input_ids.to(device)
+        prompt_emb = text_encoder(input_ids)
+        prompt_emb = prompt_emb.reshape((1, prompt_emb.shape[0]*prompt_emb.shape[1], -1))
+
+        return prompt_emb
+    
+
+    def encode_prompt(
+        self,
+        prompt,
+        positive=True,
+        device="cuda"
+    ):
+        prompt = self.process_prompt(prompt, positive=positive)
+        prompt_emb = self.encode_prompt_using_t5(prompt, self.text_encoder, self.tokenizer, 226, device)
+        return prompt_emb

diffsynth/prompters/sd_prompter.py

@@ -1,5 +1,5 @@
 from .base_prompter import BasePrompter, tokenize_long_prompt
-from ..models.model_manager import ModelManager, load_state_dict, search_for_embeddings
+from ..models.utils import load_state_dict, search_for_embeddings
 from ..models import SDTextEncoder
 from transformers import CLIPTokenizer
 import torch, os