Make extensions case-insensitive in timit_asr dataset (#4425)

Commit from https://github.com/huggingface/datasets/commit/2f9a6a5bf3e25944b3620c870896dce0c8c0d52f

timit_asr.py

@@ -129,14 +129,18 @@ class TimitASR(datasets.GeneratorBasedBuilder):
     def _generate_examples(self, split, data_dir):
         """Generate examples from TIMIT archive_path based on the test/train csv information."""
         # Iterating the contents of the data to extract the relevant information
-        for key, wav_path in enumerate(sorted(Path(data_dir).glob(f"**/{split.upper()}/**/*.WAV"))):
+        wav_paths = sorted(Path(data_dir).glob(f"**/{split.upper()}/**/*.wav"))
+        wav_paths = wav_paths if wav_paths else sorted(Path(data_dir).glob(f"**/{split.upper()}/**/*.WAV"))
+        for key, wav_path in enumerate(wav_paths):
 
             # extract transcript
-            with open(wav_path.with_suffix(".TXT"), encoding="utf-8") as op:
+            txt_path = with_case_insensitive_suffix(wav_path, ".txt")
+            with txt_path.open(encoding="utf-8") as op:
                 transcript = " ".join(op.readlines()[0].split()[2:])  # first two items are sample number
 
             # extract phonemes
-            with open(wav_path.with_suffix(".PHN"), encoding="utf-8") as op:
+            phn_path = with_case_insensitive_suffix(wav_path, ".phn")
+            with phn_path.open(encoding="utf-8") as op:
                 phonemes = [
                     {
                         "start": i.split(" ")[0],
@@ -147,7 +151,8 @@ class TimitASR(datasets.GeneratorBasedBuilder):
                 ]
 
             # extract words
-            with open(wav_path.with_suffix(".WRD"), encoding="utf-8") as op:
+            wrd_path = with_case_insensitive_suffix(wav_path, ".wrd")
+            with wrd_path.open(encoding="utf-8") as op:
                 words = [
                     {
                         "start": i.split(" ")[0],
@@ -175,3 +180,9 @@ class TimitASR(datasets.GeneratorBasedBuilder):
             }
 
             yield key, example
+
+
+def with_case_insensitive_suffix(path: Path, suffix: str):
+    path = path.with_suffix(suffix.lower())
+    path = path if path.exists() else path.with_suffix(suffix.upper())
+    return path