[Whisper] Large-v3 requires 128 Mel frequency bins (#193)

* Large-v3 requires 128 Mel frequency bins

* extract correct model dimensions and use argparse

* format

* format

---------

Co-authored-by: Awni Hannun <awni@apple.com>

whisper/benchmark.py

@@ -1,5 +1,5 @@
 # Copyright © 2023 Apple Inc.
-
+import argparse
 import sys
 import time
 
@@ -10,6 +10,22 @@ from whisper import audio, decoding, load_models, transcribe
 audio_file = "whisper/assets/ls_test.flac"
 
 
+def parse_arguments():
+    parser = argparse.ArgumentParser(description="Benchmark script.")
+    parser.add_argument(
+        "--all",
+        action="store_true",
+        help="Use all available models, i.e. tiny,small,medium,large-v3",
+    )
+    parser.add_argument(
+        "-m",
+        "--models",
+        type=str,
+        help="Specify models as a comma-separated list (e.g., tiny,small,medium)",
+    )
+    return parser.parse_args()
+
+
 def timer(fn, *args):
     for _ in range(5):
         fn(*args)
@@ -23,10 +39,10 @@ def timer(fn, *args):
     return (toc - tic) / num_its
 
 
-def feats():
+def feats(n_mels: int = 80):
     data = audio.load_audio(audio_file)
     data = audio.pad_or_trim(data)
-    mels = audio.log_mel_spectrogram(data)
+    mels = audio.log_mel_spectrogram(data, n_mels)
     mx.eval(mels)
     return mels
 
@@ -46,20 +62,20 @@ def everything(model_name):
 
 
 if __name__ == "__main__":
-
-    # get command line arguments without 3rd party libraries
-    # the command line argument to benchmark all models is "all"
+    args = parse_arguments()
+    if args.all:
+        models = ["tiny", "small", "medium", "large-v3"]
+    elif args.models:
+        models = args.models.split(",")
+    else:
         models = ["tiny"]
-    if len(sys.argv) > 1:
-        if sys.argv[1] == "--all":
-            models = ["tiny", "small", "medium", "large"]
+
+    print("Selected models:", models)
 
     feat_time = timer(feats)
     print(f"\nFeature time {feat_time:.3f}")
-    mels = feats()[None].astype(mx.float16)
 
     for model_name in models:
-
         print(f"\nModel: {model_name.upper()}")
         tokens = mx.array(
             [
@@ -95,6 +111,7 @@ if __name__ == "__main__":
             mx.int32,
         )[None]
         model = load_models.load_model(f"{model_name}", dtype=mx.float16)
+        mels = feats(model.dims.n_mels)[None].astype(mx.float16)
         model_forward_time = timer(model_forward, model, mels, tokens)
         print(f"Model forward time {model_forward_time:.3f}")
         decode_time = timer(decode, model, mels)