[GitHub] [incubator-mxnet] haojin2 commented on a change in pull request #17279: [Numpy] Add linalg.pinv op

[GitBox <gi...@apache.org>]

haojin2 commented on a change in pull request #17279: [Numpy] Add linalg.pinv op
URL: https://github.com/apache/incubator-mxnet/pull/17279#discussion_r367175293
 
 

 ##########
 File path: src/operator/numpy/linalg/np_pinv.cc
 ##########
 @@ -0,0 +1,195 @@
+/*
+ * 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.
+ */
+
+/*!
+ * Copyright (c) 2019 by Contributors
+ * \file np_pinv.cc
+ * \brief CPU implementation of the PINV Operator
+ */
+
+#include "./np_pinv-inl.h"
+
+namespace mxnet {
+namespace op {
+
+bool PinvOpShape(const nnvm::NodeAttrs& attrs,
+                 mxnet::ShapeVector *in_attrs,
+                 mxnet::ShapeVector *out_attrs) {
+  CHECK_EQ(in_attrs->size(), 2U);
+  CHECK_EQ(out_attrs->size(), 1U);
+  const mxnet::TShape& a_shape = (*in_attrs)[0];
+  const mxnet::TShape& rcond_shape = (*in_attrs)[1];
+  const mxnet::TShape& pinv_shape = (*out_attrs)[0];
+  const int a_ndim = a_shape.ndim();
+
+  if (shape_is_known(a_shape)) {
+    // Forward shape inference.
+    CHECK_GE(a_ndim, 2)
+      << "Array must be at least two-dimensional";
+    // Calculte pinv shape.
+    std::vector<int> pinv_shape_vec(a_ndim, -1);
+    for (int i = 0; i < a_ndim - 2; ++i) {
+      pinv_shape_vec[i] = a_shape[i];
+    }
+    pinv_shape_vec[a_ndim - 2] = a_shape[a_ndim - 1];
+    pinv_shape_vec[a_ndim - 1] = a_shape[a_ndim - 2];
+    SHAPE_ASSIGN_CHECK(*out_attrs, 0, mxnet::TShape(pinv_shape_vec.begin(), pinv_shape_vec.end()));
+    // Check rcond shape.
+    GetOrCheckCutoffAndLargeShape(attrs, a_shape, rcond_shape, nullptr, nullptr);
+  } else {
+    // Backward shape inference.
+    if (shape_is_known(pinv_shape)) {
 
 Review comment:
   `else if (shape_is_known(pinv_shape))`

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