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"""Tests for tensorflow.ops.math_ops.matrix_inverse."""
import tensorflow.python.platform
import numpy as np
import tensorflow as tf
class InverseOpTest(tf.test.TestCase):
def _verifyInverse(self, x):
for np_type in [np.float32, np.float64]:
y = x.astype(np_type)
with self.test_session():
# Verify that x^{-1} * x == Identity matrix.
if x.ndim == 2:
inv = tf.matrix_inverse(y)
tf_ans = tf.matmul(inv, y)
np_ans = np.identity(y.shape[-1])
else:
inv = tf.batch_matrix_inverse(y)
tf_ans = tf.batch_matmul(inv, y)
tiling = list(y.shape)
tiling[-2:] = [1, 1]
np_ans = np.tile(np.identity(y.shape[-1]), tiling)
out = tf_ans.eval()
self.assertAllClose(np_ans, out)
self.assertShapeEqual(y, tf_ans)
def testBasic(self):
# 2x2 matrices
matrix1 = np.array([[1., 2.], [3., 4.]])
matrix2 = np.array([[1., 3.], [3., 5.]])
self._verifyInverse(matrix1)
self._verifyInverse(matrix2)
# A multidimensional batch of 2x2 matrices
matrix_batch = np.concatenate([np.expand_dims(matrix1, 0),
np.expand_dims(matrix2, 0)])
matrix_batch = np.tile(matrix_batch, [2, 3, 1, 1])
self._verifyInverse(matrix_batch)
def testNonSquareMatrix(self):
# When the inverse of a non-square matrix is attempted we should return
# an error
with self.assertRaises(ValueError):
tf.matrix_inverse(np.array([[1., 2., 3.], [3., 4., 5.]]))
def testWrongDimensions(self):
# The input to the inverse should be at least a 2-dimensional tensor.
tensor3 = tf.constant([1., 2.])
with self.assertRaises(ValueError):
tf.matrix_inverse(tensor3)
def testNotInvertible(self):
# The input should be invertible.
with self.test_session():
with self.assertRaisesOpError("Input is not invertible."):
# All rows of the matrix below add to zero
tensor3 = tf.constant([[1., 0., -1.], [-1., 1., 0.], [0., -1., 1.]])
tf.matrix_inverse(tensor3).eval()
with self.test_session():
with self.assertRaisesOpError("Input is not invertible."):
# Determinant of the matrix below is zero
tensor3 = tf.constant([[1., 1.], [1., 1.]])
tf.matrix_inverse(tensor3).eval()
with self.test_session():
with self.assertRaisesOpError("Input is not invertible."):
# Determinant of the matrix below is zero
tensor3 = tf.constant([[np.inf, 1.], [1., 1.]])
tf.matrix_inverse(tensor3).eval()
def testEmpty(self):
self._verifyInverse(np.empty([0, 2, 2]))
self._verifyInverse(np.empty([2, 0, 0]))
if __name__ == "__main__":
tf.test.main()
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