piiswrong commented on a change in pull request #7082: Sparse Tensor: request 
for reviews
URL: https://github.com/apache/incubator-mxnet/pull/7082#discussion_r132833058
 
 

 ##########
 File path: python/mxnet/ndarray/sparse_ndarray.py
 ##########
 @@ -0,0 +1,906 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+
+# coding: utf-8
+"""SparseNDArray API of mxnet."""
+from __future__ import absolute_import
+from __future__ import division
+try:
+    from __builtin__ import slice as py_slice
+except ImportError:
+    from builtins import slice as py_slice
+
+import ctypes
+import warnings
+
+import os as _os
+import sys as _sys
+
+# import operator
+import numpy as np
+from ..base import NotSupportedForSparseNDArray
+from ..base import _LIB, numeric_types
+from ..base import c_array, mx_real_t
+from ..base import mx_uint, NDArrayHandle, check_call
+from ..context import Context
+from . import _internal
+from .ndarray import _DTYPE_NP_TO_MX, _DTYPE_MX_TO_NP
+from .ndarray import _STORAGE_TYPE_STR_TO_ID
+from .ndarray import NDArray, _storage_type, _zeros_ndarray, _array
+from . import cast_storage
+from . import slice as nd_slice
+
+# Use different verison of SymbolBase
+# When possible, use cython to speedup part of computation.
+# pylint: disable=unused-import
+try:
+    if int(_os.environ.get("MXNET_ENABLE_CYTHON", True)) == 0:
+        from .._ctypes.ndarray import NDArrayBase, _set_ndarray_class
+    elif _sys.version_info >= (3, 0):
+        from .._cy3.ndarray import NDArrayBase, _set_ndarray_class
 
 Review comment:
   why not import these from ndarray.py to void try except?
 
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