Python tensor.scalars函数代码示例

    def test_ifelse(self):
        config1 = theano.config.profile
        config2 = theano.config.profile_memory

        try:
            theano.config.profile = True
            theano.config.profile_memory = True

            a, b = T.scalars('a', 'b')
            x, y = T.scalars('x', 'y')

            z = ifelse(T.lt(a, b), x * 2, y * 2)

            p = theano.ProfileStats(False)

            if theano.config.mode in ["DebugMode", "DEBUG_MODE", "FAST_COMPILE"]:
                m = "FAST_RUN"
            else:
                m = None

            f_ifelse = theano.function([a, b, x, y], z, profile=p, name="test_ifelse",
                                       mode=m)

            val1 = 0.
            val2 = 1.
            big_mat1 = 10
            big_mat2 = 11

            out = f_ifelse(val1, val2, big_mat1, big_mat2)

        finally:
            theano.config.profile = config1
            theano.config.profile_memory = config2

    def test_pickle(self):
        a = T.scalar()  # the a is for 'anonymous' (un-named).
        x, s = T.scalars('xs')

        f = function([x, In(a, value=1.0, name='a'), In(s, value=0.0, update=s+a*x, mutable=True)], s+a*x)

        try:
            # Note that here we also test protocol 0 on purpose, since it
            # should work (even though one should not use it).
            g = pickle.loads(pickle.dumps(f, protocol=0))
            g = pickle.loads(pickle.dumps(f, protocol=-1))
        except NotImplementedError as e:
            if e[0].startswith('DebugMode is not picklable'):
                return
            else:
                raise
        # if they both return, assume  that they return equivalent things.
        # print [(k,id(k)) for k in f.finder.keys()]
        # print [(k,id(k)) for k in g.finder.keys()]

        self.assertFalse(g.container[0].storage is f.container[0].storage)
        self.assertFalse(g.container[1].storage is f.container[1].storage)
        self.assertFalse(g.container[2].storage is f.container[2].storage)
        self.assertFalse(x in g.container)
        self.assertFalse(x in g.value)

        self.assertFalse(g.value[1] is f.value[1])  # should not have been copied
        self.assertFalse(g.value[2] is f.value[2])  # should have been copied because it is mutable.
        self.assertFalse((g.value[2] != f.value[2]).any())  # its contents should be identical

        self.assertTrue(f(2, 1) == g(2))  # they should be in sync, default value should be copied.
        self.assertTrue(f(2, 1) == g(2))  # they should be in sync, default value should be copied.
        f(1, 2)  # put them out of sync
        self.assertFalse(f(1, 2) == g(1, 2))  # they should not be equal anymore.

    def test_multiple_functions(self):
        a = T.scalar()  # the a is for 'anonymous' (un-named).
        x, s = T.scalars('xs')
        v = T.vector('v')

        # put in some inputs
        list_of_things = [s, x, v]

        # some derived thing, whose inputs aren't all in the list
        list_of_things.append(a * x + s )

        f1 = function([x, In(a, value=1.0, name='a'), In(s, value=0.0, update=s+a*x, mutable=True)], s+a*x)
        list_of_things.append(f1)

        # now put in a function sharing container with the previous one
        f2 = function([x, In(a, value=1.0, name='a'), In(s, value=f1.container[s], update=s+a*x, mutable=True)], s+a*x)
        list_of_things.append(f2)

        assert isinstance(f2.container[s].storage, list)
        assert f2.container[s].storage is f1.container[s].storage

        # now put in a function with non-scalar
        v_value = numpy.asarray([2, 3, 4.], dtype=config.floatX)
        f3 = function([x, In(v, value=v_value)], x+v)
        list_of_things.append(f3)

        # try to pickle the entire things
        try:
            saved_format = cPickle.dumps(list_of_things, protocol=-1)
            new_list_of_things = cPickle.loads(saved_format)
        except NotImplementedError, e:
            if e[0].startswith('DebugMode is not picklable'):
                return
            else:
                raise

    def __init__(self):
        x, y, z = T.scalars('xyz')
        e = T.nnet.sigmoid((x + y + z)**2)
        op = th.OpFromGraph([x, y, z], [e])
        e2 = op(x, y, z) + op(z, y, x)

        self.inputs = [x, y, z]
        self.outputs = [e2]

    def test_callback_with_ifelse(self):
        a, b, c = tensor.scalars("abc")
        f = function(
            [a, b, c], ifelse(a, 2 * b, 2 * c), mode=Mode(optimizer=None, linker=vm.VM_Linker(callback=self.callback))
        )

        f(1, 2, 3)
        assert self.n_callbacks["IfElse"] == 2

    def test_callback(self):
        a, b, c = tensor.scalars("abc")
        f = function([a, b, c], (a + b) + c, mode=Mode(optimizer=None, linker=vm.VM_Linker(callback=self.callback)))

        f(1, 2, 3)
        assert sum(self.n_callbacks.values()) == len(f.maker.fgraph.toposort())
        f(1, 2, 3)
        assert sum(self.n_callbacks.values()) == len(f.maker.fgraph.toposort()) * 2

 def test_naming_rule1(self):
     a = T.scalar()  # the a is for 'anonymous' (un-named).
     x, s = T.scalars('xs')
     f = function([a, s], a/s)
     self.assertTrue(f(1, 2) == 0.5)
     self.assertTrue(f(2, 1) == 2.0)
     self.assertTrue(f(2, s=1) == 2.0)
     checkfor(self, lambda: f(q=2, s=1), TypeError)  # got unexpected keyword argument 'q'
     checkfor(self, lambda: f(a=2, s=1), TypeError)  # got unexpected keyword argument 'a'

    def test_weird_names(self):
        a, x, s = T.scalars('xxx')

        checkfor(self, lambda: function([In(a, name=[])], []), TypeError)

        def t():
            f = function([In(a, name=set(['adsf', ()]), value=1.0),
                          In(x, name=(), value=2.0),
                          In(s, name=T.scalar(), value=3.0)], a+x+s)
        checkfor(self, t, TypeError)

 def test_naming_rule0(self):
     x, s = T.scalars('xs')
     f = function([x, s], x/s)
     self.assertTrue(f(1, 2) == 0.5)
     self.assertTrue(f(2, 1) == 2.0)
     self.assertTrue(f(s=2, x=1) == 0.5)
     self.assertTrue(f(x=2, s=1) == 2.0)
     self.assertTrue(f(2, s=1) == 2.0)
     checkfor(self, lambda : f(2, x=2.0), TypeError)  # got multiple values for keyword argument 'x'
     checkfor(self, lambda : f(x=1), TypeError)  # takes exactly 2 non-keyword arguments (1 given)
     checkfor(self, lambda : f(s=1), TypeError)  # takes exactly 2 non-keyword arguments (0 given)

    def test_naming_rule2(self):
        a = T.scalar() # the a is for 'anonymous' (un-named).
        x,s = T.scalars('xs')

        #x's name is ignored because it is followed by anonymous parameter a.
        f = function([x, a, s], a/s)
        self.assertTrue(f(9,1,2) == 0.5)
        self.assertTrue(f(9,2,1) == 2.0)
        self.assertTrue(f(9,2, s=1) == 2.0)
        checkfor(self, lambda:f(x=9,a=2,s=1), TypeError) #got unexpected keyword argument 'x'
        checkfor(self, lambda:f(5.0,x=9), TypeError) #got unexpected keyword argument 'x'

    def test_naming_rule3(self):
        a = T.scalar()  # the a is for 'anonymous' (un-named).
        x, s = T.scalars('xs')

        # x's name is not ignored (as in test_naming_rule2) because a has a default value.
        f = function([x, In(a, value=1.0), s], a/s+x)
        self.assertTrue(f(9, 2, 4) == 9.5)  # can specify all args in order
        self.assertTrue(f(9, 2, s=4) == 9.5)  # can give s as kwarg
        self.assertTrue(f(9, s=4) == 9.25)  # can give s as kwarg, get default a
        self.assertTrue(f(x=9, s=4) == 9.25)  # can give s as kwarg, omit a, x as kw
        checkfor(self, lambda: f(x=9, a=2, s=4), TypeError)  # got unexpected keyword argument 'a'
        checkfor(self, lambda: f(), TypeError)  # takes exactly 3 non-keyword arguments (0 given)
        checkfor(self, lambda: f(x=9), TypeError)  # takes exactly 3 non-keyword arguments (1 given)

    def test_deepcopy(self):
        a = T.scalar() # the a is for 'anonymous' (un-named).
        x,s = T.scalars('xs')

        f = function([x, In(a, value=1.0,name='a'), In(s, value=0.0, update=s+a*x, mutable=True)], s+a*x)

        try:
            g = copy.deepcopy(f)
        except NotImplementedError, e:
            if e[0].startswith('DebugMode is not picklable'):
                return
            else:
                raise

    def test_shared_state0(self):
        a = T.scalar()  # the a is for 'anonymous' (un-named).
        x, s = T.scalars('xs')

        f = function([x, In(a, value=1.0, name='a'), In(s, value=0.0, update=s+a*x, mutable=True)], s+a*x)
        g = function([x, In(a, value=1.0, name='a'), In(s, value=f.container[s], update=s-a*x, mutable=True)], s+a*x)

        f(1, 2)
        self.assertTrue(f[s] == 2)
        self.assertTrue(g[s] == 2)
        g(1, 2)
        self.assertTrue(f[s] == 0)
        self.assertTrue(g[s] == 0)

    def __init__(self):
        a = T.scalar()  # the a is for 'anonymous' (un-named).
        x, s = T.scalars('xs')
        v = T.vector('v')

        self.s = s
        self.x = x
        self.v = v

        self.e = a * x + s

        self.f1 = function([x, In(a, value=1.0, name='a'), In(s, value=0.0, update=s+a*x, mutable=True)], s+a*x)

        self.f2 = function([x, In(a, value=1.0, name='a'), In(s, value=self.f1.container[s], update=s+a*x, mutable=True)], s+a*x)

    def test_naming_rule4(self):
        a = T.scalar()  # the a is for 'anonymous' (un-named).
        x, s = T.scalars('xs')

        f = function([x, In(a, value=1.0, name='a'), s], a/s+x)

        self.assertTrue(f(9, 2, 4) == 9.5)  # can specify all args in order
        self.assertTrue(f(9, 2, s=4) == 9.5)  # can give s as kwarg
        self.assertTrue(f(9, s=4) == 9.25)  # can give s as kwarg, get default a
        self.assertTrue(f(9, a=2, s=4) == 9.5)  # can give s as kwarg, a as kwarg
        self.assertTrue(f(x=9, a=2, s=4) == 9.5)  # can give all kwargs
        self.assertTrue(f(x=9, s=4) == 9.25)  # can give all kwargs
        checkfor(self, lambda: f(), TypeError)  # takes exactly 3 non-keyword arguments (0 given)
        checkfor(self, lambda: f(5.0, x=9), TypeError)  # got multiple values for keyword argument 'x'