Python tensor.matrix函数代码示例

def funcs(dataset, network, batch_size=BATCH_SIZE, learning_rate=LEARNING_RATE, momentum=MOMENTUM, alpha=L2_CONSTANT):

    """
        Method the returns the theano functions that are used in
        training and testing. These are the train and predict functions.
        The predict function returns out output of the network.
    """

    # symbolic variables
    X_batch = T.matrix()
    y_batch = T.matrix()

    # this is the cost of the network when fed throught the noisey network
    l2 = lasagne.regularization.l2(X_batch)
    train_output = lasagne.layers.get_output(network, X_batch)
    cost = lasagne.objectives.mse(train_output, y_batch)
    cost = cost.mean() #+ alpha*l2

    # test the performance of the netowork without noise
    test = lasagne.layers.get_output(network, X_batch, deterministic=True)
    pred = T.argmax(test, axis=1)
    accuracy = T.mean(T.eq(pred, y_batch), dtype=theano.config.floatX)

    all_params = lasagne.layers.get_all_params(network)
    updates = lasagne.updates.nesterov_momentum(cost, all_params, learning_rate, momentum)

    train = theano.function(inputs=[X_batch, y_batch], outputs=cost, updates=updates, allow_input_downcast=True)
    valid = theano.function(inputs=[X_batch, y_batch], outputs=cost, allow_input_downcast=True)
    predict = theano.function(inputs=[X_batch], outputs=pred, allow_input_downcast=True)

    return dict(
        train=train,
        valid=valid,
        predict=predict
    )

	def __init__(self, embedding_dim=100, num_hidden_layers=2, hidden_dim=200, in_dropout_p=0.2, hidden_dropout_p=0.5, update_hyperparams={'learning_rate': 0.01}):
		self.embedding_dim = embedding_dim
		self.num_hidden_layers = num_hidden_layers
		self.hidden_dim = hidden_dim
		self.in_dropout_p = in_dropout_p
		self.hidden_dropout_p = update_hyperparams
	
		print >> sys.stderr, 'Building computation graph for discriminator...'		
		self.input_var = T.matrix('input')
		self.target_var = T.matrix('targer')

		self.l_in = lasagne.layers.InputLayer(shape=(None, self.embedding_dim), input_var=T.tanh(self.input_var), name='l_in')
		self.l_in_dr = lasagne.layers.DropoutLayer(self.l_in, 0.2)
		self.layers = [self.l_in, self.l_in_dr]
		for i in xrange(self.num_hidden_layers):
			l_hid = lasagne.layers.batch_norm(lasagne.layers.DenseLayer(self.layers[-1], num_units=self.hidden_dim, nonlinearity=lasagne.nonlinearities.leaky_rectify, W=lasagne.init.GlorotUniform(gain=leaky_relu_gain), name=('l_hid_%s' % i)))
			l_hid_dr = lasagne.layers.DropoutLayer(l_hid, 0.5)
			self.layers.append(l_hid)
			self.layers.append(l_hid_dr)
		self.l_preout = lasagne.layers.batch_norm(lasagne.layers.DenseLayer(self.layers[-1], num_units=1, nonlinearity=None, name='l_preout'))
		self.l_out = lasagne.layers.NonlinearityLayer(self.l_preout, nonlinearity=lasagne.nonlinearities.sigmoid, name='l_out')

		self.prediction = lasagne.layers.get_output(self.l_out)
		self.loss = lasagne.objectives.binary_crossentropy(self.prediction, self.target_var).mean()
		self.accuracy = T.eq(T.ge(self.prediction, 0.5), self.target_var).mean()

		self.params = lasagne.layers.get_all_params(self.l_out, trainable=True)
		self.updates = lasagne.updates.adam(self.loss, self.params, **update_hyperparams)

		print >> sys.stderr, 'Compiling discriminator...'
		self.train_fn = theano.function([self.input_var, self.target_var], [self.loss, self.accuracy], updates=self.updates)
		self.eval_fn = theano.function([self.input_var, self.target_var], [self.loss, self.accuracy])

def Z_LSTM(input_var, z_dim=256, nhid=512, layers=2, gradclip=10, training=True):
    ret = {}
    state_vars = []
    ret['input'] = layer = nn.layers.InputLayer(input_var=input_var, shape=(None, None, z_dim))
    batchsize, seqlen, _ = layer.input_var.shape
    for lay in xrange(layers):
        ret['drop_{}'.format(lay)] = layer = nn.layers.DropoutLayer(layer, p=0.3)
        if training:
            ret['lstm_{}'.format(lay)] = layer = LSTMSampleableLayer(layer, nhid,
                grad_clipping=gradclip, learn_init=True)
        else:
            cell_var = T.matrix('cell_var_{}'.format(lay))
            hid_var = T.matrix('hid_var_{}'.format(lay))
            state_vars.append(cell_var)
            state_vars.append(hid_var)
            ret['lstm_{}'.format(lay)] = layer = LSTMSampleableLayer(layer, nhid,
                cell_init=cell_var, hid_init=hid_var)
        ret['cell_{}'.format(lay)] = nn.layers.SliceLayer(layer, axis=2,
                indices=slice(None,nhid))
        ret['hid_{}'.format(lay)] = layer = nn.layers.SliceLayer(layer, axis=2,
                indices=slice(nhid,None))
    ret['reshape'] = layer = nn.layers.ReshapeLayer(layer, (-1, nhid))
    ret['project'] = layer = nn.layers.DenseLayer(layer, num_units=z_dim, nonlinearity=None)
    ret['output'] = layer = nn.layers.ReshapeLayer(layer, (batchsize, seqlen, z_dim))
    # final state slice layers for passing to next instance of lstm
    for lay in xrange(layers):
        ret['cellfinal_{}'.format(lay)] = nn.layers.SliceLayer(ret['cell_{}'.format(lay)],
                axis=1, indices=-1)
        ret['hidfinal_{}'.format(lay)] = nn.layers.SliceLayer(ret['hid_{}'.format(lay)], 
                axis=1, indices=-1)
    return ret, state_vars

def fine_train(nn,datasets,learning_Rate,batch_sizes,epochs):
	train_set_x, train_set_y = datasets[0]
	n_batches = train_set_x.get_value(borrow=True).shape[0] / batch_sizes
	
	train_label = T.cast(train_label,'float64')
	index = T.lscalar()
	x = T.matrix('x')
	y = T.matrix('y')
	min_batch_cost = []
	if nn is None:
		mynn = ForwordNN(x,y,n_in,n_out,hidden_sizes)
	else:
		mynn=nn
	cost,update = mynn.get_cost_update(x,y,learning_Rate)
	train_nn = theano.function([index],
				cost,
				updates = update,
				givens = {
							x:train_data[index*batch_sizes:(index+1)*batch_sizes,:],
							y:train_label[index*batch_sizes:(index+1)*batch_sizes,:]
						}
				)
	for num_epochs in range(epochs):
		t1=time.time()
		for num_batch in xrange(n_train_batchs):
			min_batch_cost.append(train_nn(num_batch))
		t2=time.time()
		print 'The %d/%dth training,takes %f seconds,cost is %f' %(num_epochs+1,epochs,(t2-t1),np.mean(min_batch_cost))
	return mynn	

 def init_variables(self):
     self.input_var = T.matrix('inputs')
     self.side_var = T.matrix('contexts')
     # do regression
     #self.target_var = T.ivector('targets')
     self.target_var = T.vector('targets')
     self.num_classes = 1 # regression -> dim matters, not classes

    def test_string_var(self):
        orig_compute_test_value = theano.config.compute_test_value
        try:
            theano.config.compute_test_value = 'raise'

            x = T.matrix('x')
            x.tag.test_value = numpy.random.rand(3,4).astype(config.floatX)
            y = T.matrix('y')
            y.tag.test_value = numpy.random.rand(4,5).astype(config.floatX)

            z = theano.shared(numpy.random.rand(5,6).astype(config.floatX))

            # should work
            out = T.dot(T.dot(x,y), z)
            assert hasattr(out.tag, 'test_value')
            tf = theano.function([x,y], out)
            assert _allclose(
                    tf(x.tag.test_value, y.tag.test_value),
                    out.tag.test_value)

            def f(x,y,z):
                return T.dot(T.dot(x,y),z)

            # this test should fail
            z.set_value(numpy.random.rand(7,6).astype(config.floatX))
            self.assertRaises(ValueError, f, x, y, z)
        finally:
            theano.config.compute_test_value = orig_compute_test_value

def set_generation_function(recurrent_model, output_model):
    # set input data (1*num_samples*features)
    input_data  = tensor.matrix(name='input_seq', dtype=floatX)
    # set init hidden/cell(num_samples*hidden_size)
    prev_hidden_data = tensor.matrix(name='prev_hidden_data', dtype=floatX)
    prev_cell_data   = tensor.matrix(name='prev_cell_data', dtype=floatX)

    # get hidden data
    recurrent_data = get_tensor_output(input=[input_data, prev_hidden_data, prev_cell_data], layers=recurrent_model, is_training=False)
    cur_hidden_data = recurrent_data[0]
    cur_cell_data   = recurrent_data[1]

    # get prediction data
    output_data = get_tensor_output(input=cur_hidden_data, layers=output_model, is_training=False)

    # input data
    generation_function_inputs  = [input_data,
                                   prev_hidden_data,
                                   prev_cell_data]
    generation_function_outputs = [cur_hidden_data,
                                   cur_cell_data,
                                   output_data]

    generation_function = theano.function(inputs=generation_function_inputs,
                                          outputs=generation_function_outputs,
                                          on_unused_input='ignore')
    return generation_function

    def est_both_assert_merge_2_reverse(self):
        # Test case "test_both_assert_merge_2" but in reverse order
        x1 = T.matrix('x1')
        x2 = T.matrix('x2')
        x3 = T.matrix('x3')
        e = T.dot(x1, T.opt.assert_op(x2, (x2 > x3).all())) +\
            T.dot(T.opt.assert_op(x1, (x1 > x3).all()), x2)
        g = FunctionGraph([x1, x2, x3], [e])
        MergeOptimizer().optimize(g)
        strg = theano.printing.debugprint(g, file='str')
        strref = '''Elemwise{add,no_inplace} [@A] ''   7
 |dot [@B] ''   6
 | |Assert{msg='Theano Assert failed!'} [@C] ''   5
 | | |x1 [@D]
 | | |All [@E] ''   3
 | |   |Elemwise{gt,no_inplace} [@F] ''   1
 | |     |x1 [@D]
 | |     |x3 [@G]
 | |Assert{msg='Theano Assert failed!'} [@H] ''   4
 |   |x2 [@I]
 |   |All [@J] ''   2
 |     |Elemwise{gt,no_inplace} [@K] ''   0
 |       |x2 [@I]
 |       |x3 [@G]
 |dot [@B] ''   6
'''
        print(strg)
        assert strg == strref, (strg, strref)

def rebuild_nn(nn_params):
    W_e, W_p, W_o, b_o = read_obj(nn_params, 4)
    mlp = MLPNoHid(W_e.get_value(), W_p.get_value(), W_o.get_value(), b_o.get_value())
    wx = T.matrix('word', dtype='int32')
    px = T.matrix('POS', dtype='int32')
    f_pred = theano.function([wx, px], mlp.output(wx, px))
    return f_pred

def test_sequence_variable_inputs():
    x, y = tensor.matrix(), tensor.matrix()

    parallel_1 = Parallel(input_names=['input_1', 'input_2'],
                          input_dims=dict(input_1=4, input_2=5),
                          output_dims=dict(input_1=3, input_2=2),
                          prototype=Linear(), weights_init=Constant(2),
                          biases_init=Constant(1))
    parallel_2 = Parallel(input_names=['input_1', 'input_2'],
                          input_dims=dict(input_1=3, input_2=2),
                          output_dims=dict(input_1=5, input_2=4),
                          prototype=Linear(), weights_init=Constant(2),
                          biases_init=Constant(1))
    sequence = Sequence([parallel_1.apply, parallel_2.apply])
    sequence.initialize()
    new_x, new_y = sequence.apply(x, y)
    x_val = numpy.ones((4, 4), dtype=theano.config.floatX)
    y_val = numpy.ones((4, 5), dtype=theano.config.floatX)
    assert_allclose(
        new_x.eval({x: x_val}),
        (x_val.dot(2 * numpy.ones((4, 3))) + numpy.ones((4, 3))).dot(
            2 * numpy.ones((3, 5))) + numpy.ones((4, 5)))
    assert_allclose(
        new_y.eval({y: y_val}),
        (y_val.dot(2 * numpy.ones((5, 2))) + numpy.ones((4, 2))).dot(
            2 * numpy.ones((2, 4))) + numpy.ones((4, 4)))

    def build_model(self):
        ######################
        # BUILD ACTUAL MODEL #
        ######################
        logger.info('... building the model')

        U, W, V, bh, by = self.U, self.W, self.V, self.bh, self.by
        x = T.matrix('x')
        y = T.matrix('y')

        def forward_prop_step(x_t, s_tm1, U, W, bh):
            s_t = self.activation(T.dot(U, x_t) + T.dot(W, s_tm1) + bh)
            return s_t

        s, _ = theano.scan(
            forward_prop_step,
            sequences=x,
            outputs_info=[dict(initial=T.zeros(self.hidden_dim))],
            non_sequences=[U, W, bh],
            mode='DebugMode')

        p_y = T.nnet.softmax(T.dot(self.V, s[-1]) + by)
        prediction = T.argmax(p_y, axis=1)
        o_error = T.sum(T.nnet.categorical_crossentropy(p_y, y))
        self.cost = o_error + self.L1_reg * self.L1 + self.L2_reg * self.L2_sqr

        # Assign functions
        self.forward_propagation = theano.function([x], s[-1])
        self.predict = theano.function([x], prediction)
        self.ce_error = theano.function([x, y], o_error)

        l_r = T.scalar('l_r', dtype=theano.config.floatX)   # learning rate (may change)
        mom = T.scalar('mom', dtype=theano.config.floatX)   # momentum
        self.bptt, self.f_update = self.Momentum(x, y, l_r, mom)

 def test_infer_shape(self):
     admat = matrix()
     bdmat = matrix()
     admat_val = numpy.random.rand(3, 4).astype(config.floatX)
     bdmat_val = numpy.random.rand(3, 4).astype(config.floatX)
     self._compile_and_check([admat, bdmat], [SoftmaxGrad()(admat, bdmat)],
                         [admat_val, bdmat_val], SoftmaxGrad)

    def _setup_vars(self, sparse_input):
        '''Setup Theano variables for our network.

        Parameters
        ----------
        sparse_input : bool
            Not used -- sparse inputs are not supported for recurrent networks.

        Returns
        -------
        vars : list of theano variables
            A list of the variables that this network requires as inputs.
        '''
        _warn_dimshuffle()

        assert not sparse_input, 'Theanets does not support sparse recurrent models!'

        self.src = TT.ftensor3('src')
        #self.src_mask = TT.imatrix('src_mask')
        self.src_mask = TT.matrix('src_mask')
        self.dst = TT.ftensor3('dst')
        self.labels = TT.imatrix('labels')
        self.weights = TT.matrix('weights')

        if self.weighted:
            return [self.src, self.src_mask, self.dst, self.labels, self.weights]
        return [self.src, self.dst]

def test_hgemm_swap():
    from theano.sandbox.cuda import nvcc_compiler
    if nvcc_compiler.nvcc_version < '7.5':
        raise SkipTest("SgemmEx is only avaialble on cuda 7.5+")

    v = tensor.vector(dtype='float16')
    m = tensor.matrix(dtype='float16')
    m2 = tensor.matrix(dtype='float16')
    m32 = tensor.matrix(dtype='float32')

    # test that we don't try to replace anything but matrix x matrix in float16
    f = theano.function([v, m], tensor.dot(v, m), mode=mode_with_gpu)
    assert len([node for node in f.maker.fgraph.apply_nodes
                if isinstance(node.op, GpuGemm)]) == 0

    f = theano.function([m32, m], tensor.dot(m32, m), mode=mode_with_gpu)
    assert len([node for node in f.maker.fgraph.apply_nodes
                if isinstance(node.op, GpuGemm)]) == 0

    f = theano.function([m, m2], tensor.dot(m, m2), mode=mode_with_gpu)
    assert len([node for node in f.maker.fgraph.apply_nodes
                if isinstance(node.op, GpuGemm)]) == 1

    v1 = numpy.random.random((3, 4)).astype('float16')
    v2 = numpy.random.random((4, 2)).astype('float16')

    of = f(v1, v2)
    on = numpy.dot(v1, v2)

    utt.assert_allclose(of, on)

 def _construct_sample_from_prior(self):
     """
     Construct a function for drawing independent samples from the
     distribution generated by this MultiStageModel. This function returns
     the full sequence of "partially completed" examples.
     """
     z_sym = T.matrix()
     x_sym = T.matrix()
     irs = self.ir_steps
     oputs = [self.obs_transform(self.s0)]
     oputs.extend([self.obs_transform(self.si[i]) for i in range(irs)])
     _, hi_zmuv = self._construct_zmuv_samples(x_sym, 1)
     sample_func = theano.function(inputs=[z_sym, x_sym], outputs=oputs, \
             givens={ self.z: z_sym, \
                      self.x_in: T.zeros_like(x_sym), \
                      self.x_out: T.zeros_like(x_sym), \
                      self.hi_zmuv: hi_zmuv }, \
             updates=self.scan_updates)
     def prior_sampler(samp_count):
         x_samps = to_fX( np.zeros((samp_count, self.obs_dim)) )
         old_switch = self.train_switch.get_value(borrow=False)
         # set model to generation mode
         self.set_train_switch(switch_val=0.0)
         z_samps = to_fX( npr.randn(samp_count, self.z_dim) )
         model_samps = sample_func(z_samps, x_samps)
         # set model back to either training or generation mode
         self.set_train_switch(switch_val=old_switch)
         return model_samps
     return prior_sampler