From f41959ccb2d9d4c722fe8fc3351401d53bcf4900 Mon Sep 17 00:00:00 2001
From: Manjunath Kudlur <keveman@gmail.com>
Date: Fri, 6 Nov 2015 16:27:58 -0800
Subject: TensorFlow: Initial commit of TensorFlow library. TensorFlow is an
 open source software library for numerical computation using data flow
 graphs.

Base CL: 107276108
---
 tensorflow/core/kernels/matrix_inverse_op.cc | 64 ++++++++++++++++++++++++++++
 1 file changed, 64 insertions(+)
 create mode 100644 tensorflow/core/kernels/matrix_inverse_op.cc

(limited to 'tensorflow/core/kernels/matrix_inverse_op.cc')

diff --git a/tensorflow/core/kernels/matrix_inverse_op.cc b/tensorflow/core/kernels/matrix_inverse_op.cc
new file mode 100644
index 0000000000..ad0948d6ef
--- /dev/null
+++ b/tensorflow/core/kernels/matrix_inverse_op.cc
@@ -0,0 +1,64 @@
+// See docs in ../ops/linalg_ops.cc.
+#include <cmath>
+
+#include "tensorflow/core/framework/kernel_def_builder.h"
+#include "tensorflow/core/framework/op_kernel.h"
+#include "tensorflow/core/kernels/linalg_ops_common.h"
+#include "tensorflow/core/lib/core/errors.h"
+#include "tensorflow/core/platform/logging.h"
+#include "tensorflow/core/platform/port.h"
+#include "tensorflow/core/public/tensor_shape.h"
+#include "third_party/eigen3/Eigen/LU"
+
+namespace tensorflow {
+
+template <class Scalar, bool SupportsBatchOperationT>
+class MatrixInverseOp
+    : public LinearAlgebraOp<Scalar, SupportsBatchOperationT> {
+ public:
+  explicit MatrixInverseOp(OpKernelConstruction* context)
+      : LinearAlgebraOp<Scalar, SupportsBatchOperationT>(context) {}
+  ~MatrixInverseOp() override {}
+
+  TensorShape GetOutputMatrixShape(
+      const TensorShape& input_matrix_shape) override {
+    return input_matrix_shape;
+  }
+
+  int64 GetCostPerUnit(const TensorShape& input_matrix_shape) override {
+    const int64 rows = input_matrix_shape.dim_size(0);
+    if (rows > (1LL << 20)) {
+      // A big number to cap the cost in case overflow.
+      return kint32max;
+    } else {
+      return rows * rows * rows;
+    }
+  }
+
+  using typename LinearAlgebraOp<Scalar, SupportsBatchOperationT>::MatrixMap;
+  using
+      typename LinearAlgebraOp<Scalar, SupportsBatchOperationT>::ConstMatrixMap;
+
+  void ComputeMatrix(OpKernelContext* context, const ConstMatrixMap& input,
+                     MatrixMap* output) override {
+    OP_REQUIRES(context, input.rows() == input.cols(),
+                errors::InvalidArgument("Input matrix must be square."));
+    if (input.rows() == 0) {
+      // By definition, an empty matrix's inverse is an emptry matrix.
+      return;
+    }
+    Eigen::FullPivLU<Eigen::Matrix<Scalar, Eigen::Dynamic, Eigen::Dynamic,
+                                   Eigen::RowMajor>> lu_decomposition(input);
+    OP_REQUIRES(context, lu_decomposition.isInvertible(),
+                errors::InvalidArgument("Input is not invertible."));
+    *output = lu_decomposition.inverse();
+  }
+};
+
+REGISTER_LINALG_OP("MatrixInverse", (MatrixInverseOp<float, false>), float);
+REGISTER_LINALG_OP("MatrixInverse", (MatrixInverseOp<double, false>), double);
+REGISTER_LINALG_OP("BatchMatrixInverse", (MatrixInverseOp<float, true>), float);
+REGISTER_LINALG_OP("BatchMatrixInverse", (MatrixInverseOp<double, true>),
+                   double);
+
+}  // namespace tensorflow
-- 
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