[MusicGen] Add sampling rate to config (#26136)

* [MusicGen] Add sampling rate to config

* remove tiny

* make property

* Update tests/pipelines/test_pipelines_text_to_audio.py
Co-authored-by: Arthur <48595927+ArthurZucker@users.noreply.github.com>

* style

---------
Co-authored-by: Arthur <48595927+ArthurZucker@users.noreply.github.com>

src/transformers/models/musicgen/configuration_musicgen.py

@@ -226,3 +226,8 @@ class MusicgenConfig(PretrainedConfig):
             decoder=decoder_config.to_dict(),
             **kwargs,
         )
+
+    @property
+    # This is a property because you might want to change the codec model on the fly
+    def sampling_rate(self):
+        return self.audio_encoder.sampling_rate

tests/pipelines/test_pipelines_text_to_audio.py

@@ -41,35 +41,32 @@ class TextToAudioPipelineTests(unittest.TestCase):
 
     @slow
     @require_torch
-    def test_small_model_pt(self):
-        speech_generator = pipeline(task="text-to-audio", model="facebook/musicgen-small", framework="pt")
+    def test_small_musicgen_pt(self):
+        music_generator = pipeline(task="text-to-audio", model="facebook/musicgen-small", framework="pt")
 
         forward_params = {
             "do_sample": False,
             "max_new_tokens": 250,
         }
 
-        outputs = speech_generator("This is a test", forward_params=forward_params)
-        # musicgen sampling_rate is not straightforward to get
-        self.assertIsNone(outputs["sampling_rate"])
-
-        audio = outputs["audio"]
-        self.assertEqual(ANY(np.ndarray), audio)
+        outputs = music_generator("This is a test", forward_params=forward_params)
+        self.assertEqual({"audio": ANY(np.ndarray), "sampling_rate": 32000}, outputs)
 
         # test two examples side-by-side
-        outputs = speech_generator(["This is a test", "This is a second test"], forward_params=forward_params)
+        outputs = music_generator(["This is a test", "This is a second test"], forward_params=forward_params)
         audio = [output["audio"] for output in outputs]
         self.assertEqual([ANY(np.ndarray), ANY(np.ndarray)], audio)
 
         # test batching
-        outputs = speech_generator(
+        outputs = music_generator(
             ["This is a test", "This is a second test"], forward_params=forward_params, batch_size=2
         )
-        self.assertEqual(ANY(np.ndarray), outputs[0]["audio"])
+        audio = [output["audio"] for output in outputs]
+        self.assertEqual([ANY(np.ndarray), ANY(np.ndarray)], audio)
 
     @slow
     @require_torch
-    def test_large_model_pt(self):
+    def test_small_bark_pt(self):
         speech_generator = pipeline(task="text-to-audio", model="suno/bark-small", framework="pt")
 
         forward_params = {