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Lazy import libraries in src/transformers/image_utils.py #36435

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merged 3 commits into from
Feb 27, 2025
+16 −11
Merged

Lazy import libraries in src/transformers/image_utils.py #36435

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8bc343b
Lazy import libraries in `src/transformers/image_utils.py`
hmellor Feb 26, 2025
e0d621c
`make fixup`
hmellor Feb 26, 2025
9fb285f
Protect imports
hmellor Feb 27, 2025
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27 changes: 16 additions & 11 deletions src/transformers/image_utils.py
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Original file line number Diff line number Diff line change
Expand Up @@ -74,17 +74,6 @@
PILImageResampling.LANCZOS: InterpolationMode.LANCZOS,
}

if is_decord_available():
from decord import VideoReader, cpu

if is_av_available():
import av

if is_cv2_available():
import cv2

if is_yt_dlp_available():
from yt_dlp import YoutubeDL

if TYPE_CHECKING:
if is_torch_available():
Expand Down Expand Up @@ -608,6 +597,10 @@ def sample_indices_fn(metadata, **kwargs):
- Numpy array of frames in RGB (shape: [num_frames, height, width, 3]).
- `VideoMetadata` object.
"""
# Lazy import cv2
requires_backends(read_video_opencv, ["cv2"])
import cv2

video = cv2.VideoCapture(video_path)
total_num_frames = int(video.get(cv2.CAP_PROP_FRAME_COUNT))
video_fps = video.get(cv2.CAP_PROP_FPS)
Expand Down Expand Up @@ -661,6 +654,10 @@ def sample_indices_fn(metadata, **kwargs):
- Numpy array of frames in RGB (shape: [num_frames, height, width, 3]).
- `VideoMetadata` object.
"""
# Lazy import from decord
requires_backends(read_video_decord, ["decord"])
from decord import VideoReader, cpu

vr = VideoReader(uri=video_path, ctx=cpu(0)) # decord has problems with gpu
video_fps = vr.get_avg_fps()
total_num_frames = len(vr)
Expand Down Expand Up @@ -700,6 +697,10 @@ def sample_indices_fn(metadata, **kwargs):
- Numpy array of frames in RGB (shape: [num_frames, height, width, 3]).
- `VideoMetadata` object.
"""
# Lazy import av
requires_backends(read_video_pyav, ["av"])
import av

container = av.open(video_path)
total_num_frames = container.streams.video[0].frames
video_fps = container.streams.video[0].average_rate # should we better use `av_guess_frame_rate`?
Expand Down Expand Up @@ -834,6 +835,10 @@ def sample_indices_fn_func(metadata, **fn_kwargs):
if video.startswith("https://www.youtube.com") or video.startswith("http://www.youtube.com"):
if not is_yt_dlp_available():
raise ImportError("To load a video from YouTube url you have to install `yt_dlp` first.")
# Lazy import from yt_dlp
requires_backends(load_video, ["yt_dlp"])
from yt_dlp import YoutubeDL

buffer = BytesIO()
with redirect_stdout(buffer), YoutubeDL() as f:
f.download([video])
Expand Down