[BugFix] extract gz into target dir (#3389)

python/dgl/data/utils.py

@@ -219,7 +219,8 @@ def extract_archive(file, target_dir, overwrite=False):
         import gzip
         import shutil
         with gzip.open(file, 'rb') as f_in:
-            with open(file[:-3], 'wb') as f_out:
+            target_file = os.path.join(target_dir, os.path.basename(file)[:-3])
+            with open(target_file, 'wb') as f_out:
                 shutil.copyfileobj(f_in, f_out)
     elif file.endswith('.zip'):
         import zipfile

tests/compute/test_data.py

@@ -2,6 +2,9 @@
 import unittest
 import backend as F
 import numpy as np
+import gzip
+import tempfile
+import os
 
 
 @unittest.skipIf(F._default_context_str == 'gpu', reason="Datasets don't need to be tested on GPU.")
@@ -139,10 +142,25 @@ def test_reddit():
     assert np.array_equal(dst, np.sort(dst))
 
 
+@unittest.skipIf(F._default_context_str == 'gpu', reason="Datasets don't need to be tested on GPU.")
+def test_extract_archive():
+    # gzip
+    with tempfile.TemporaryDirectory() as src_dir:
+        gz_file = 'gz_archive'
+        gz_path = os.path.join(src_dir, gz_file + '.gz')
+        content = b"test extract archive gzip"
+        with gzip.open(gz_path, 'wb') as f:
+            f.write(content)
+        with tempfile.TemporaryDirectory() as dst_dir:
+            data.utils.extract_archive(gz_path, dst_dir, overwrite=True)
+            assert os.path.exists(os.path.join(dst_dir, gz_file))
+
+
 if __name__ == '__main__':
     test_minigc()
     test_gin()
     test_data_hash()
     test_tudataset_regression()
     test_fraud()
     test_fakenews()
+    test_extract_archive()