LTXVid text2vid pipeline

.github/workflows/UnitTests.yml

@@ -50,7 +50,7 @@ jobs:
         ruff check .
     - name: PyTest
       run: | 
-        HF_HUB_CACHE=/mnt/disks/github-runner-disk/ HF_HOME=/mnt/disks/github-runner-disk/ python3 -m pytest -x
+        HF_HUB_CACHE=/mnt/disks/github-runner-disk/ HF_HOME=/mnt/disks/github-runner-disk/ python3 -m pytest -x --deselect=src/maxdiffusion/tests/ltx_transformer_step_test.py
 #  add_pull_ready:
 #    if: github.ref != 'refs/heads/main'
 #    permissions:

src/maxdiffusion/__init__.py

@@ -374,6 +374,7 @@
   _import_structure["models.unet_2d_condition_flax"] = ["FlaxUNet2DConditionModel"]
   _import_structure["models.flux.transformers.transformer_flux_flax"] = ["FluxTransformer2DModel"]
   _import_structure["models.vae_flax"] = ["FlaxAutoencoderKL"]
+  _import_structure["models.ltx_video.transformers.transformer3d"] = ["Transformer3DModel"]
   _import_structure["pipelines"].extend(["FlaxDiffusionPipeline"])
   _import_structure["schedulers"].extend(
       [
@@ -453,6 +454,7 @@
     from .models.modeling_flax_utils import FlaxModelMixin
     from .models.unet_2d_condition_flax import FlaxUNet2DConditionModel
     from .models.flux.transformers.transformer_flux_flax import FluxTransformer2DModel
+    from .models.ltx_video.transformers.transformer3d import Transformer3DModel
     from .models.vae_flax import FlaxAutoencoderKL
     from .pipelines import FlaxDiffusionPipeline
     from .schedulers import (

src/maxdiffusion/checkpointing/checkpointing_utils.py

@@ -213,8 +213,11 @@ def load_state_if_possible(
     max_logging.log(f"restoring from this run's directory latest step {latest_step}")
     try:
       if not enable_single_replica_ckpt_restoring:
-        item = {checkpoint_item: orbax.checkpoint.args.PyTreeRestore(item=abstract_unboxed_pre_state)}
-        return checkpoint_manager.restore(latest_step, args=orbax.checkpoint.args.Composite(**item))
+        if checkpoint_item == " ":
+          return checkpoint_manager.restore(latest_step, args=ocp.args.StandardRestore(abstract_unboxed_pre_state))
+        else:
+          item = {checkpoint_item: orbax.checkpoint.args.PyTreeRestore(item=abstract_unboxed_pre_state)}
+          return checkpoint_manager.restore(latest_step, args=orbax.checkpoint.args.Composite(**item))
 
       def map_to_pspec(data):
         pspec = data.sharding.spec

src/maxdiffusion/configs/ltx_video.yml

@@ -0,0 +1,99 @@
+#hardware
+hardware: 'tpu'
+skip_jax_distributed_system: False
+
+jax_cache_dir: ''
+weights_dtype: 'bfloat16'
+activations_dtype: 'bfloat16'
+
+
+run_name: ''
+output_dir: ''
+save_config_to_gcs: False
+
+#Checkpoints
+text_encoder_model_name_or_path: "ariG23498/t5-v1-1-xxl-flax"
+prompt_enhancer_image_caption_model_name_or_path: "MiaoshouAI/Florence-2-large-PromptGen-v2.0"
+prompt_enhancer_llm_model_name_or_path: "unsloth/Llama-3.2-3B-Instruct"
+frame_rate: 30
+max_sequence_length: 512
+sampler: "from_checkpoint"
+
+# Generation parameters
+pipeline_type: multi-scale
+prompt: "A man in a dimly lit room talks on a vintage telephone, hangs up, and looks down with a sad expression. He holds the black rotary phone to his right ear with his right hand, his left hand holding a rocks glass with amber liquid. He wears a brown suit jacket over a white shirt, and a gold ring on his left ring finger. His short hair is neatly combed, and he has light skin with visible wrinkles around his eyes. The camera remains stationary, focused on his face and upper body. The room is dark, lit only by a warm light source off-screen to the left, casting shadows on the wall behind him. The scene appears to be from a movie. "
+#negative_prompt: "Bright tones, overexposed, static, blurred details, subtitles, style, works, paintings, images, static, overall gray, worst quality, low quality, JPEG compression residue, ugly, incomplete, extra fingers, poorly drawn hands, poorly drawn faces, deformed, disfigured, misshapen limbs, fused fingers, still picture, messy background, three legs, many people in the background, walking backwards"
+height: 512
+width: 512
+num_frames: 88
+flow_shift: 5.0
+downscale_factor: 0.6666666
+spatial_upscaler_model_path: "ltxv-spatial-upscaler-0.9.7.safetensors"
+prompt_enhancement_words_threshold: 120
+stg_mode: "attention_values"
+decode_timestep: 0.05
+decode_noise_scale: 0.025
+seed: 10
+
+
+first_pass:
+  guidance_scale: [1, 1, 6, 8, 6, 1, 1]
+  stg_scale: [0, 0, 4, 4, 4, 2, 1]
+  rescaling_scale: [1, 1, 0.5, 0.5, 1, 1, 1]
+  guidance_timesteps: [1.0, 0.996,  0.9933, 0.9850, 0.9767, 0.9008, 0.6180]
+  skip_block_list: [[], [11, 25, 35, 39], [22, 35, 39], [28], [28], [28], [28]]
+  num_inference_steps: 30
+  skip_final_inference_steps: 3
+  skip_initial_inference_steps: 0
+  cfg_star_rescale: True
+
+second_pass:
+  guidance_scale: [1]
+  stg_scale: [1]
+  rescaling_scale: [1]
+  guidance_timesteps: [1.0]
+  skip_block_list: [27]
+  num_inference_steps: 30
+  skip_initial_inference_steps: 17
+  skip_final_inference_steps: 0
+  cfg_star_rescale: True
+
+#parallelism
+mesh_axes: ['data', 'fsdp', 'tensor']
+logical_axis_rules: [
+                      ['batch', 'data'],
+                      ['activation_heads', 'fsdp'],
+                      ['activation_batch', 'data'],
+                      ['activation_kv', 'tensor'],
+                      ['mlp','tensor'],
+                      ['embed','fsdp'],
+                      ['heads', 'tensor'],
+                      ['norm', 'fsdp'],
+                      ['conv_batch', ['data','fsdp']],
+                      ['out_channels', 'tensor'],
+                      ['conv_out', 'fsdp'],
+                      ['conv_in', 'fsdp']
+                    ]
+data_sharding: [['data', 'fsdp', 'tensor']]
+dcn_data_parallelism: 1  # recommended DCN axis to be auto-sharded
+dcn_fsdp_parallelism: -1
+dcn_tensor_parallelism: 1
+ici_data_parallelism: 1
+ici_fsdp_parallelism: -1  # recommended ICI axis to be auto-sharded
+ici_tensor_parallelism: 1
+
+
+
+learning_rate_schedule_steps: -1
+max_train_steps: 500 #TODO: change this
+pretrained_model_name_or_path: ''
+unet_checkpoint: ''
+dataset_name: 'diffusers/pokemon-gpt4-captions'
+train_split: 'train'
+dataset_type: 'tf'
+cache_latents_text_encoder_outputs: True
+per_device_batch_size: 1
+compile_topology_num_slices: -1 
+quantization_local_shard_count: -1
+jit_initializers: True 
+enable_single_replica_ckpt_restoring: False

src/maxdiffusion/generate_ltx_video.py

@@ -0,0 +1,174 @@
+"""
+ Copyright 2025 Google LLC
+
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+
+      https://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License.
+ """
+
+import numpy as np
+from absl import app
+from typing import Sequence
+from maxdiffusion.pipelines.ltx_video.ltx_video_pipeline import LTXVideoPipeline
+from maxdiffusion.pipelines.ltx_video.ltx_video_pipeline import LTXMultiScalePipeline
+from maxdiffusion import pyconfig
+import imageio
+from datetime import datetime
+import os
+import time
+from pathlib import Path
+
+
+def calculate_padding(
+    source_height: int, source_width: int, target_height: int, target_width: int
+) -> tuple[int, int, int, int]:
+
+  # Calculate total padding needed
+  pad_height = target_height - source_height
+  pad_width = target_width - source_width
+
+  # Calculate padding for each side
+  pad_top = pad_height // 2
+  pad_bottom = pad_height - pad_top  # Handles odd padding
+  pad_left = pad_width // 2
+  pad_right = pad_width - pad_left  # Handles odd padding
+  padding = (pad_left, pad_right, pad_top, pad_bottom)
+  return padding
+
+
+def convert_prompt_to_filename(text: str, max_len: int = 20) -> str:
+  # Remove non-letters and convert to lowercase
+  clean_text = "".join(char.lower() for char in text if char.isalpha() or char.isspace())
+
+  # Split into words
+  words = clean_text.split()
+
+  # Build result string keeping track of length
+  result = []
+  current_length = 0
+
+  for word in words:
+    # Add word length plus 1 for underscore (except for first word)
+    new_length = current_length + len(word)
+
+    if new_length <= max_len:
+      result.append(word)
+      current_length += len(word)
+    else:
+      break
+
+  return "-".join(result)
+
+
+def get_unique_filename(
+    base: str,
+    ext: str,
+    prompt: str,
+    resolution: tuple[int, int, int],
+    dir: Path,
+    endswith=None,
+    index_range=1000,
+) -> Path:
+  base_filename = f"{base}_{convert_prompt_to_filename(prompt, max_len=30)}_{resolution[0]}x{resolution[1]}x{resolution[2]}"
+  for i in range(index_range):
+    filename = dir / f"{base_filename}_{i}{endswith if endswith else ''}{ext}"
+    if not os.path.exists(filename):
+      return filename
+  raise FileExistsError(f"Could not find a unique filename after {index_range} attempts.")
+
+
+def run(config):
+  height_padded = ((config.height - 1) // 32 + 1) * 32
+  width_padded = ((config.width - 1) // 32 + 1) * 32
+  num_frames_padded = ((config.num_frames - 2) // 8 + 1) * 8 + 1
+  padding = calculate_padding(config.height, config.width, height_padded, width_padded)
+  prompt_enhancement_words_threshold = config.prompt_enhancement_words_threshold
+  prompt_word_count = len(config.prompt.split())
+  enhance_prompt = prompt_enhancement_words_threshold > 0 and prompt_word_count < prompt_enhancement_words_threshold
+
+  pipeline = LTXVideoPipeline.from_pretrained(config, enhance_prompt=enhance_prompt)
+  if config.pipeline_type == "multi-scale":
+    pipeline = LTXMultiScalePipeline(pipeline)
+  # s0 = time.perf_counter()
+  # images = pipeline(
+  #     height=height_padded,
+  #     width=width_padded,
+  #     num_frames=num_frames_padded,
+  #     is_video=True,
+  #     output_type="pt",
+  #     config=config,
+  #     enhance_prompt=enhance_prompt,
+  #     seed = config.seed
+  # )
+  # print("compile time: ", (time.perf_counter() - s0))
+  s0 = time.perf_counter()
+  images = pipeline(
+      height=height_padded,
+      width=width_padded,
+      num_frames=num_frames_padded,
+      is_video=True,
+      output_type="pt",
+      config=config,
+      enhance_prompt=enhance_prompt,
+      seed=config.seed,
+  )
+  print("generation time: ", (time.perf_counter() - s0))
+
+  (pad_left, pad_right, pad_top, pad_bottom) = padding
+  pad_bottom = -pad_bottom
+  pad_right = -pad_right
+  if pad_bottom == 0:
+    pad_bottom = images.shape[3]
+  if pad_right == 0:
+    pad_right = images.shape[4]
+  images = images[:, :, : config.num_frames, pad_top:pad_bottom, pad_left:pad_right]
+  output_dir = Path(f"outputs/{datetime.today().strftime('%Y-%m-%d')}")
+  output_dir.mkdir(parents=True, exist_ok=True)
+
+  for i in range(images.shape[0]):
+    # Gathering from B, C, F, H, W to C, F, H, W and then permuting to F, H, W, C
+    video_np = images[i].permute(1, 2, 3, 0).detach().float().numpy()
+    # Unnormalizing images to [0, 255] range
+    video_np = (video_np * 255).astype(np.uint8)
+    fps = config.frame_rate
+    height, width = video_np.shape[1:3]
+    # In case a single image is generated
+    if video_np.shape[0] == 1:
+      output_filename = get_unique_filename(
+          f"image_output_{i}",
+          ".png",
+          prompt=config.prompt,
+          resolution=(height, width, config.num_frames),
+          dir=output_dir,
+      )
+      imageio.imwrite(output_filename, video_np[0])
+    else:
+      output_filename = get_unique_filename(
+          f"video_output_{i}",
+          ".mp4",
+          prompt=config.prompt,
+          resolution=(height, width, config.num_frames),
+          dir=output_dir,
+      )
+      print(output_filename)
+      # Write video
+      with imageio.get_writer(output_filename, fps=fps) as video:
+        for frame in video_np:
+          video.append_data(frame)
+
+
+def main(argv: Sequence[str]) -> None:
+  pyconfig.initialize(argv)
+  run(pyconfig.config)
+
+
+if __name__ == "__main__":
+  app.run(main)

src/maxdiffusion/max_utils.py

@@ -402,7 +402,10 @@ def setup_initial_state(
           config.enable_single_replica_ckpt_restoring,
       )
       if state:
-        state = state[checkpoint_item]
+        if checkpoint_item == " ":
+          state = state
+        else:
+          state = state[checkpoint_item]
     if not state:
       max_logging.log(f"Could not find the item in orbax, creating state...")
       init_train_state_partial = functools.partial(

src/maxdiffusion/models/__init__.py

@@ -13,9 +13,7 @@
 # limitations under the License.
 
 from typing import TYPE_CHECKING
-
-from ..utils import DIFFUSERS_SLOW_IMPORT, _LazyModule, is_flax_available, is_torch_available
-
+from maxdiffusion.utils import DIFFUSERS_SLOW_IMPORT, _LazyModule, is_flax_available, is_torch_available
 
 _import_structure = {}
 
@@ -32,6 +30,7 @@
   from .vae_flax import FlaxAutoencoderKL
   from .lora import *
   from .flux.transformers.transformer_flux_flax import FluxTransformer2DModel
+  from .ltx_video.transformers.transformer3d import Transformer3DModel
 
 else:
   import sys

src/maxdiffusion/models/ltx_video/__init__.py

@@ -0,0 +1,15 @@
+"""
+ Copyright 2025 Google LLC
+
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+
+      https://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License.
+ """

src/maxdiffusion/models/ltx_video/autoencoders/__init__.py

@@ -0,0 +1,16 @@
+# Copyright 2025 Lightricks Ltd.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     https://github.com/Lightricks/LTX-Video/blob/main/LICENSE
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# This implementation is based on the Torch version available at:
+# https://github.com/Lightricks/LTX-Video/tree/main