[Wav2Vec2] PyCTCDecode Integration to support language model boosted decoding (#14339)

* up

* up

* up

* make it cleaner

* correct

* make styhahalal

* add more tests

* finish

* small fix

* make style

* up

* tryout to solve cicrle ci

* up

* fix more tests

* fix more tests

* apply sylvains suggestions

* fix import

* correct docs

* add pyctcdecode only to speech tests

* fix more tests

* add tf, flax and pt tests

* add pt

* fix last tests

* fix more tests

* Apply suggestions from code review

* change lines

* Apply suggestions from code review

Co-authored-by: Anton Lozhkov <aglozhkov@gmail.com>

* correct tests

* correct tests

* add doc string

Co-authored-by: Anton Lozhkov <aglozhkov@gmail.com>

src/transformers/testing_utils.py

@@ -36,8 +36,10 @@ from .file_utils import (
     is_faiss_available,
     is_flax_available,
     is_keras2onnx_available,
+    is_librosa_available,
     is_onnx_available,
     is_pandas_available,
+    is_pyctcdecode_available,
     is_pytesseract_available,
     is_pytorch_quantization_available,
     is_rjieba_available,
@@ -598,6 +600,26 @@ def require_deepspeed(test_case):
         return test_case
 
 
+def require_pyctcdecode(test_case):
+    """
+    Decorator marking a test that requires pyctcdecode
+    """
+    if not is_pyctcdecode_available():
+        return unittest.skip("test requires pyctcdecode")(test_case)
+    else:
+        return test_case
+
+
+def require_librosa(test_case):
+    """
+    Decorator marking a test that requires librosa
+    """
+    if not is_librosa_available():
+        return unittest.skip("test requires librosa")(test_case)
+    else:
+        return test_case
+
+
 def get_gpu_count():
     """
     Return the number of available gpus (regardless of whether torch, tf or jax is used)