ComfyUI/comfy/text_encoders/lt.py

from comfy import sd1_clip
import os
from transformers import T5TokenizerFast
from .spiece_tokenizer import SPieceTokenizer
import comfy.text_encoders.genmo
from comfy.ldm.lightricks.embeddings_connector import Embeddings1DConnector
import torch
import comfy.utils

class T5XXLTokenizer(sd1_clip.SDTokenizer):
    def __init__(self, embedding_directory=None, tokenizer_data={}):
        tokenizer_path = os.path.join(os.path.dirname(os.path.realpath(__file__)), "t5_tokenizer")
        super().__init__(tokenizer_path, embedding_directory=embedding_directory, pad_with_end=False, embedding_size=4096, embedding_key='t5xxl', tokenizer_class=T5TokenizerFast, has_start_token=False, pad_to_max_length=False, max_length=99999999, min_length=128, tokenizer_data=tokenizer_data) #pad to 128?


class LTXVT5Tokenizer(sd1_clip.SD1Tokenizer):
    def __init__(self, embedding_directory=None, tokenizer_data={}):
        super().__init__(embedding_directory=embedding_directory, tokenizer_data=tokenizer_data, clip_name="t5xxl", tokenizer=T5XXLTokenizer)


def ltxv_te(*args, **kwargs):
    return comfy.text_encoders.genmo.mochi_te(*args, **kwargs)


class Gemma3_12BTokenizer(sd1_clip.SDTokenizer):
    def __init__(self, embedding_directory=None, tokenizer_data={}):
        tokenizer = tokenizer_data.get("spiece_model", None)
        super().__init__(tokenizer, pad_with_end=False, embedding_size=3840, embedding_key='gemma3_12b', tokenizer_class=SPieceTokenizer, has_end_token=False, pad_to_max_length=False, max_length=99999999, min_length=1, tokenizer_args={"add_bos": True, "add_eos": False}, tokenizer_data=tokenizer_data)

    def state_dict(self):
        return {"spiece_model": self.tokenizer.serialize_model()}

class LTXAVGemmaTokenizer(sd1_clip.SD1Tokenizer):
    def __init__(self, embedding_directory=None, tokenizer_data={}):
        super().__init__(embedding_directory=embedding_directory, tokenizer_data=tokenizer_data, name="gemma3_12b", tokenizer=Gemma3_12BTokenizer)

class Gemma3_12BModel(sd1_clip.SDClipModel):
    def __init__(self, device="cpu", layer="all", layer_idx=None, dtype=None, attention_mask=True, model_options={}):
        llama_scaled_fp8 = model_options.get("gemma_scaled_fp8", None)
        if llama_scaled_fp8 is not None:
            model_options = model_options.copy()
            model_options["scaled_fp8"] = llama_scaled_fp8

        super().__init__(device=device, layer=layer, layer_idx=layer_idx, textmodel_json_config={}, dtype=dtype, special_tokens={"start": 2, "pad": 0}, layer_norm_hidden_state=False, model_class=comfy.text_encoders.llama.Gemma3_12B, enable_attention_masks=attention_mask, return_attention_masks=attention_mask, model_options=model_options)

    def tokenize_with_weights(self, text, return_word_ids=False, llama_template="{}", image_embeds=None, **kwargs):
        text = llama_template.format(text)
        text_tokens = super().tokenize_with_weights(text, return_word_ids)
        embed_count = 0
        for k in text_tokens:
            tt = text_tokens[k]
            for r in tt:
                for i in range(len(r)):
                    if r[i][0] == 262144:
                        if image_embeds is not None and embed_count < image_embeds.shape[0]:
                            r[i] = ({"type": "embedding", "data": image_embeds[embed_count], "original_type": "image"},) + r[i][1:]
                            embed_count += 1
        return text_tokens

class LTXAVTEModel(torch.nn.Module):
    def __init__(self, dtype_llama=None, device="cpu", dtype=None, model_options={}):
        super().__init__()
        self.dtypes = set()
        self.dtypes.add(dtype)

        self.gemma3_12b = Gemma3_12BModel(device=device, dtype=dtype_llama, model_options=model_options, layer="all", layer_idx=None)
        self.dtypes.add(dtype_llama)

        operations = self.gemma3_12b.operations # TODO
        self.text_embedding_projection = operations.Linear(3840 * 49, 3840, bias=False, dtype=dtype, device=device)

        self.audio_embeddings_connector = Embeddings1DConnector(
            split_rope=True,
            double_precision_rope=True,
            dtype=dtype,
            device=device,
            operations=operations,
        )

        self.video_embeddings_connector = Embeddings1DConnector(
            split_rope=True,
            double_precision_rope=True,
            dtype=dtype,
            device=device,
            operations=operations,
        )

    def set_clip_options(self, options):
        self.gemma3_12b.set_clip_options(options)

    def reset_clip_options(self):
        self.gemma3_12b.reset_clip_options()

    def encode_token_weights(self, token_weight_pairs):
        token_weight_pairs = token_weight_pairs["gemma3_12b"]

        out, pooled, extra = self.gemma3_12b.encode_token_weights(token_weight_pairs)
        out_device = out.device
        out = out.movedim(1, -1).to(self.text_embedding_projection.weight.device)
        out = 8.0 * (out - out.mean(dim=(1, 2), keepdim=True)) / (out.amax(dim=(1, 2), keepdim=True) - out.amin(dim=(1, 2), keepdim=True) + 1e-6)
        out = out.reshape((out.shape[0], out.shape[1], -1))
        out = self.text_embedding_projection(out)
        out_vid = self.video_embeddings_connector(out)[0]
        out_audio = self.audio_embeddings_connector(out)[0]
        out = torch.concat((out_vid, out_audio), dim=-1)

        return out.to(out_device), pooled

    def load_sd(self, sd):
        if "model.layers.47.self_attn.q_norm.weight" in sd:
            return self.gemma3_12b.load_sd(sd)
        else:
            sdo = comfy.utils.state_dict_prefix_replace(sd, {"text_embedding_projection.aggregate_embed.weight": "text_embedding_projection.weight", "model.diffusion_model.video_embeddings_connector.": "video_embeddings_connector.", "model.diffusion_model.audio_embeddings_connector.": "audio_embeddings_connector."}, filter_keys=True)
            if len(sdo) == 0:
                sdo = sd

            return self.load_state_dict(sdo, strict=False)


def ltxav_te(dtype_llama=None, llama_scaled_fp8=None):
    class LTXAVTEModel_(LTXAVTEModel):
        def __init__(self, device="cpu", dtype=None, model_options={}):
            if llama_scaled_fp8 is not None and "llama_scaled_fp8" not in model_options:
                model_options = model_options.copy()
                model_options["llama_scaled_fp8"] = llama_scaled_fp8
            if dtype_llama is not None:
                dtype = dtype_llama
            super().__init__(dtype_llama=dtype_llama, device=device, dtype=dtype, model_options=model_options)
    return LTXAVTEModel_