Update download path for speechcommands (#2777)

Summary:
previous download link for v0.02 did not download the entire dataset, but only the training dataset, resulting in issues when trying to access the testing or validation data.

Pull Request resolved: #2777

Reviewed By: nateanl

Differential Revision: D40480605

Pulled By: carolineechen

fbshipit-source-id: a594506b4ccfb548a7d5043b716c58463480c103

Author: Caroline Chen

torchaudio/datasets/speechcommands.py

@@ -13,8 +13,8 @@
 EXCEPT_FOLDER = "_background_noise_"
 SAMPLE_RATE = 16000
 _CHECKSUMS = {
-    "https://storage.googleapis.com/download.tensorflow.org/data/speech_commands_v0.01.tar.gz": "743935421bb51cccdb6bdd152e04c5c70274e935c82119ad7faeec31780d811d",  # noqa: E501
-    "https://storage.googleapis.com/download.tensorflow.org/data/speech_commands_v0.02.tar.gz": "af14739ee7dc311471de98f5f9d2c9191b18aedfe957f4a6ff791c709868ff58",  # noqa: E501
+    "http://download.tensorflow.org/data/speech_commands_v0.01.tar.gz": "743935421bb51cccdb6bdd152e04c5c70274e935c82119ad7faeec31780d811d",  # noqa: E501
+    "http://download.tensorflow.org/data/speech_commands_v0.02.tar.gz": "af14739ee7dc311471de98f5f9d2c9191b18aedfe957f4a6ff791c709868ff58",  # noqa: E501
 }
 
 
@@ -85,7 +85,7 @@ def __init__(
             "speech_commands_v0.01",
             "speech_commands_v0.02",
         ]:
-            base_url = "https://storage.googleapis.com/download.tensorflow.org/data/"
+            base_url = "http://download.tensorflow.org/data/"
             ext_archive = ".tar.gz"
 
             url = os.path.join(base_url, url + ext_archive)