Fix broken code in download_lm.py (#1046)

egs/librispeech/ASR/local/download_lm.py

@@ -41,9 +41,57 @@ import os
 import shutil
 from pathlib import Path
 
-from lhotse.utils import urlretrieve_progress
 from tqdm.auto import tqdm
 
+# This function is copied from lhotse
+def tqdm_urlretrieve_hook(t):
+    """Wraps tqdm instance.
+    Don't forget to close() or __exit__()
+    the tqdm instance once you're done with it (easiest using `with` syntax).
+    Example
+    -------
+    >>> from urllib.request import urlretrieve
+    >>> with tqdm(...) as t:
+    ...     reporthook = tqdm_urlretrieve_hook(t)
+    ...     urlretrieve(..., reporthook=reporthook)
+
+    Source: https://github.com/tqdm/tqdm/blob/master/examples/tqdm_wget.py
+    """
+    last_b = [0]
+
+    def update_to(b=1, bsize=1, tsize=None):
+        """
+        b  : int, optional
+            Number of blocks transferred so far [default: 1].
+        bsize  : int, optional
+            Size of each block (in tqdm units) [default: 1].
+        tsize  : int, optional
+            Total size (in tqdm units). If [default: None] or -1,
+            remains unchanged.
+        """
+        if tsize not in (None, -1):
+            t.total = tsize
+        displayed = t.update((b - last_b[0]) * bsize)
+        last_b[0] = b
+        return displayed
+
+    return update_to
+
+
+# This function is copied from lhotse
+def urlretrieve_progress(url, filename=None, data=None, desc=None):
+    """
+    Works exactly like urllib.request.urlretrieve, but attaches a tqdm hook to
+    display a progress bar of the download.
+    Use "desc" argument to display a user-readable string that informs what is
+    being downloaded.
+    """
+    from urllib.request import urlretrieve
+
+    with tqdm(unit="B", unit_scale=True, unit_divisor=1024, miniters=1, desc=desc) as t:
+        reporthook = tqdm_urlretrieve_hook(t)
+        return urlretrieve(url=url, filename=filename, reporthook=reporthook, data=data)
+
 
 def get_args():
     parser = argparse.ArgumentParser()