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sglang/python/sglang/multimodal_gen/runtime/pipelines/flux.py
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3.5 KiB
Python

# Copied and adapted from: https://github.com/hao-ai-lab/FastVideo
# SPDX-License-Identifier: Apache-2.0
from sglang.multimodal_gen.runtime.pipelines_core import LoRAPipeline
from sglang.multimodal_gen.runtime.pipelines_core.composed_pipeline_base import (
ComposedPipelineBase,
)
from sglang.multimodal_gen.runtime.pipelines_core.schedule_batch import Req
from sglang.multimodal_gen.runtime.pipelines_core.stages import (
ConditioningStage,
DecodingStage,
DenoisingStage,
InputValidationStage,
LatentPreparationStage,
TextEncodingStage,
TimestepPreparationStage,
)
from sglang.multimodal_gen.runtime.server_args import ServerArgs
from sglang.multimodal_gen.runtime.utils.logging_utils import init_logger
# TODO(will): move PRECISION_TO_TYPE to better place
logger = init_logger(__name__)
def calculate_shift(
image_seq_len,
base_seq_len: int = 256,
max_seq_len: int = 4096,
base_shift: float = 0.5,
max_shift: float = 1.15,
):
m = (max_shift - base_shift) / (max_seq_len - base_seq_len)
b = base_shift - m * base_seq_len
mu = image_seq_len * m + b
return mu
def prepare_mu(batch: Req, server_args: ServerArgs):
height = batch.height
width = batch.width
vae_scale_factor = (
server_args.pipeline_config.vae_config.arch_config.vae_scale_factor
)
image_seq_len = (int(height) // vae_scale_factor) * (int(width) // vae_scale_factor)
mu = calculate_shift(
image_seq_len,
# hard code, since scheduler_config is not in PipelineConfig now
256,
4096,
0.5,
1.15,
)
return "mu", mu
class FluxPipeline(LoRAPipeline, ComposedPipelineBase):
pipeline_name = "FluxPipeline"
_required_config_modules = [
"text_encoder",
"text_encoder_2",
"tokenizer",
"tokenizer_2",
"vae",
"transformer",
"scheduler",
]
def create_pipeline_stages(self, server_args: ServerArgs):
"""Set up pipeline stages with proper dependency injection."""
self.add_stage(
stage_name="input_validation_stage", stage=InputValidationStage()
)
self.add_stage(
stage_name="prompt_encoding_stage_primary",
stage=TextEncodingStage(
text_encoders=[
self.get_module("text_encoder"),
self.get_module("text_encoder_2"),
],
tokenizers=[
self.get_module("tokenizer"),
self.get_module("tokenizer_2"),
],
),
)
self.add_stage(stage_name="conditioning_stage", stage=ConditioningStage())
self.add_stage(
stage_name="timestep_preparation_stage",
stage=TimestepPreparationStage(
scheduler=self.get_module("scheduler"),
prepare_extra_set_timesteps_kwargs=[prepare_mu],
),
)
self.add_stage(
stage_name="latent_preparation_stage",
stage=LatentPreparationStage(
scheduler=self.get_module("scheduler"),
transformer=self.get_module("transformer"),
),
)
self.add_stage(
stage_name="denoising_stage",
stage=DenoisingStage(
transformer=self.get_module("transformer"),
scheduler=self.get_module("scheduler"),
),
)
self.add_stage(
stage_name="decoding_stage", stage=DecodingStage(vae=self.get_module("vae"))
)
EntryClass = FluxPipeline