Files
hao-ai-lab-FastVideo/examples/inference/optimizations/attention_example.py
T

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Python

import os
import time
from fastvideo import VideoGenerator
def main():
# set the attention backend
os.environ["FASTVIDEO_ATTENTION_BACKEND"] = "FLASH_ATTN"
start_time = time.perf_counter()
gen = VideoGenerator.from_pretrained(
model_path="Wan-AI/Wan2.1-T2V-1.3B-Diffusers",
num_gpus=1,
)
load_time = time.perf_counter() - start_time
print(f"Model loading time: {load_time:.2f} seconds")
gen_start_time = time.perf_counter()
gen.generate_video(
prompt=
"Will Smith casually eats noodles, his relaxed demeanor contrasting with the energetic background of a bustling street food market. The scene captures a mix of humor and authenticity. Mid-shot framing, vibrant lighting.",
seed=1024,
output_path="example_outputs/")
generation_time = time.perf_counter() - gen_start_time
print(f"Video generation time: {generation_time:.2f} seconds")
total_time = time.perf_counter() - start_time
print(f"Total execution time: {total_time:.2f} seconds")
if __name__ == "__main__":
main()