from __future__ import absolute_import, print_function, division
from theano.tensor.xlogx import xlogx, xlogy0

import unittest

import theano
from theano.tensor import as_tensor_variable
from . import test_basic as TT

import random
import numpy.random
from theano.tests import unittest_tools as utt


class T_XlogX(unittest.TestCase):
    def setUp(self):
        utt.seed_rng()

    def test0(self):
        x = as_tensor_variable([1, 0])
        y = xlogx(x)
        f = theano.function([], [y])
        self.assertTrue(numpy.all(f() == numpy.asarray([0, 0.])))
    def test1(self):
#        class Dummy(object):
#            def make_node(self, a):
#                return [xlogx(a)[:,2]]
        utt.verify_grad(xlogx, [numpy.random.rand(3, 4)])


class T_XlogY0(unittest.TestCase):
    def setUp(self):
        utt.seed_rng()
    def test2(self):
        utt.verify_grad(xlogy0, [numpy.random.rand(3, 4), numpy.random.rand(3, 4)])

    def test3(self):
        x = as_tensor_variable([1, 0])
        y = as_tensor_variable([1, 0])
        z = xlogy0(x, y)
        f = theano.function([], z)
        self.assertTrue(numpy.all(f() == numpy.asarray([0, 0.])))


if __name__ == '__main__':
    unittest.main()
