removes decord (#33987)

* removes decord dependency

optimize

np

Revert "optimize"

This reverts commit faa136b51ec4ec5858e5b0ae40eb7ef89a88b475.

helpers as documentation

pydoc

missing keys

* make fixup

* require_av

---------

Co-authored-by: ad <hi@arnaudiaz.com>

tests/test_pipeline_mixin.py

@@ -51,7 +51,7 @@ from transformers.pipelines import (
 )
 from transformers.testing_utils import (
     is_pipeline_test,
-    require_decord,
+    require_av,
     require_pytesseract,
     require_timm,
     require_torch,
@@ -722,14 +722,14 @@ class PipelineTesterMixin:
     @is_pipeline_test
     @require_torch_or_tf
     @require_vision
-    @require_decord
+    @require_av
     def test_pipeline_video_classification(self):
         self.run_task_tests(task="video-classification")
 
     @is_pipeline_test
     @require_vision
-    @require_decord
     @require_torch
+    @require_av
     def test_pipeline_video_classification_fp16(self):
         self.run_task_tests(task="video-classification", torch_dtype="float16")