Python tensor.fscalar函数代码示例

def test_no_complex():
    width_var = tensor.cscalar()
    freq_var = tensor.fscalar()
    signal_var = tensor.fscalar()
    stft_out = tensor.exp(width_var * freq_var) * signal_var
    theano.function([width_var, freq_var, signal_var], stft_out,
                    mode=mode_with_gpu)

def create_learning_rate_func(solver_params):
    base = tt.fscalar('base')
    gamma = tt.fscalar('gamma')
    power = tt.fscalar('power')
    itrvl = tt.fscalar('itrvl')
    iter = tt.scalar('iter')

    if solver_params['lr_type']=='inv':
        lr_ = base * tt.pow(1 + gamma * iter, -power)

        lr = t.function(
            inputs=[iter, t.Param(base, default=solver_params['base']), t.Param(gamma, default=solver_params['gamma']), t.Param(power, default=solver_params['power'])],
            outputs=lr_)

    elif solver_params['lr_type']=='fixed':
        lr_ = base

        lr = t.function(
            inputs=[iter, t.Param(base, default=solver_params['base'])],
            outputs=lr_,
            on_unused_input='ignore')

    elif solver_params['lr_type']=='episodic':
        lr_ = base / (tt.floor(iter/itrvl) + 1)

        lr = t.function(
            inputs=[iter, t.Param(base, default=solver_params['base']), t.Param(itrvl, default=solver_params['interval'])],
            outputs=lr_,
            on_unused_input='ignore')
    return lr

  def __init__(self, vocabulary_size, hidden_size, output_size):
    X = tensor.ivector()
    Y = tensor.ivector()
    keep_prob = tensor.fscalar()
    learning_rate = tensor.fscalar()

    emb_layer = Embedding(vocabulary_size, hidden_size)
    lstm_layer = BiLSTM(hidden_size, hidden_size)
    dropout_layer = Dropout(keep_prob)
    fc_layer = FullConnect(2*hidden_size, output_size)
    crf = CRF(output_size)
    # graph defination
    X_emb = emb_layer(X)
    scores = fc_layer(tensor.tanh(lstm_layer(dropout_layer(X_emb))))
    
    loss, predict = crf(scores, Y, isTraining=True)
    # loss, predict and accuracy
    accuracy = tensor.sum(tensor.eq(predict, Y)) * 1.0 / Y.shape[0]

    params = emb_layer.params + lstm_layer.params + fc_layer.params + crf.params
    updates = MomentumSGD(loss, params, lr=learning_rate)

    print("Compiling train function: ")
    train = theano.function(inputs=[X, Y, keep_prob, learning_rate], outputs=[predict, accuracy, loss], 
      updates=updates, allow_input_downcast=True)

    print("Compiling evaluate function: ")
    evaluate = theano.function(inputs=[X_emb, Y, keep_prob], outputs=[predict, accuracy, loss], 
      allow_input_downcast=True)

    self.embedding_tensor = emb_layer.params[0]
    self.train = train
    self.evaluate = evaluate
    self.params = params

    def __init__(self, n_comp=10, verbose=False):

        # Theano initialization
        self.T_weights = shared(np.eye(n_comp, dtype=np.float32))
        self.T_bias = shared(np.ones((n_comp, 1), dtype=np.float32))

        T_p_x_white = T.fmatrix()
        T_lrate = T.fscalar()
        T_block = T.fscalar()
        T_unmixed = T.dot(self.T_weights,T_p_x_white) + T.addbroadcast(self.T_bias,1)
        T_logit = 1 - 2 / (1 + T.exp(-T_unmixed))

        T_out =  self.T_weights +  T_lrate * T.dot(T_block * T.identity_like(self.T_weights) + T.dot(T_logit, T.transpose(T_unmixed)), self.T_weights)
        T_bias_out = self.T_bias + T_lrate * T.reshape(T_logit.sum(axis=1), (-1,1))
        T_max_w = T.max(self.T_weights)
        T_isnan = T.any(T.isnan(self.T_weights))

        self.w_up_fun = theano.function([T_p_x_white, T_lrate, T_block],
                                        [T_max_w, T_isnan],
                                        updates=[(self.T_weights, T_out),
                                                 (self.T_bias, T_bias_out)],
                                        allow_input_downcast=True)

        T_matrix = T.fmatrix()
        T_cov = T.dot(T_matrix,T.transpose(T_matrix))/T_block
        self.cov_fun = theano.function([T_matrix, T_block], T_cov, allow_input_downcast=True)
        
        self.loading = None
        self.sources = None
        self.weights = None
        self.n_comp = n_comp
        self.verbose = verbose

    def test_default_dtype(self):
        random = RandomStreams(utt.fetch_seed())
        low = tensor.dscalar()
        high = tensor.dscalar()

        # Should not silently downcast from low and high
        out0 = random.uniform(low=low, high=high, size=(42,))
        assert out0.dtype == 'float64'
        f0 = function([low, high], out0)
        val0 = f0(-2.1, 3.1)
        assert val0.dtype == 'float64'

        # Should downcast, since asked explicitly
        out1 = random.uniform(low=low, high=high, size=(42,), dtype='float32')
        assert out1.dtype == 'float32'
        f1 = function([low, high], out1)
        val1 = f1(-1.1, 1.1)
        assert val1.dtype == 'float32'

        # Should use floatX
        lowf = tensor.fscalar()
        highf = tensor.fscalar()
        outf = random.uniform(low=lowf, high=highf, size=(42,))
        assert outf.dtype == config.floatX
        ff = function([lowf, highf], outf)
        valf = ff(numpy.float32(-0.1), numpy.float32(0.3))
        assert valf.dtype == config.floatX

    def __build_iterative_functions(self):

        def states_dot(lambda_x, lambda_y, x_data, y_data):
            [x_dot, h_dot, y_dot] = T.grad(-self.energy_sum, self.states)
            x_dot_final = lambda_x * (x_data - self.x) + (1. - lambda_x) * x_dot
            y_dot_final = lambda_y * (y_data - self.y) + (1. - lambda_y) * y_dot
            return [x_dot_final, h_dot, y_dot_final]

        lambda_x = T.fscalar('lambda_x')
        lambda_y = T.fscalar('lambda_y')

        x_data = self.outside_world.x_data
        y_data = self.outside_world.y_data_one_hot

        states_dot = [x_dot, h_dot, y_dot] = states_dot(lambda_x, lambda_y, x_data, y_data)

        kinetic_energy = T.mean( sum( [(state_dot ** 2).sum(axis=1) for state_dot in states_dot] ) )
        params_dot = T.grad(kinetic_energy, self.params)

        # UPDATES
        epsilon  = T.fscalar('epsilon')
        alpha_W1 = T.fscalar('alpha_W1')
        alpha_W2 = T.fscalar('alpha_W2')
        learning_rates = [alpha_W1,alpha_W1,alpha_W1,alpha_W2,alpha_W2]

        Delta_states = [epsilon * state_dot for state_dot in states_dot]
        Delta_params = [alpha * param_dot for alpha,param_dot in zip(learning_rates,params_dot)]
        states_new = [state+Delta for state,Delta in zip(self.states,Delta_states)]
        params_new = [param+Delta for param,Delta in zip(self.params,Delta_params)]
        updates_states = zip(self.states,states_new)
        updates_params = zip(self.params,params_new)

        # OUTPUTS FOR MONITORING
        error_rate   = T.mean(T.neq(self.prediction, self.outside_world.y_data))
        mse          = T.mean(((self.y - self.outside_world.y_data_one_hot) ** 2).sum(axis=1))
        norm_grad_hy = T.sqrt( (h_dot ** 2).mean(axis=0).sum() + (y_dot ** 2).mean(axis=0).sum() )
        Delta_W1 = Delta_params[1]
        Delta_W2 = Delta_params[3]
        Delta_logW1  = T.sqrt( (Delta_W1 ** 2).mean() ) / T.sqrt( (self.W1 ** 2).mean() )
        Delta_logW2  = T.sqrt( (Delta_W2 ** 2).mean() ) / T.sqrt( (self.W2 ** 2).mean() )

        # THEANO FUNCTIONS
        iterative_function = theano.function(
            inputs=[lambda_x, lambda_y, epsilon, alpha_W1, alpha_W2],
            outputs=[self.energy, norm_grad_hy, self.prediction, error_rate, mse, Delta_logW1, Delta_logW2],
            updates=updates_params+updates_states
        )

        relaxation_function = theano.function(
            inputs=[epsilon],
            outputs=[self.energy, norm_grad_hy, self.prediction, error_rate, mse],
            givens={
            lambda_y: T.constant(0.)
            },
            updates=updates_states[1:3]
        )

        return iterative_function, relaxation_function

    def generate_theano_functions(self, next_layer):
        '''Compile necessary theano functions'''
        exp = tensor.fmatrix('expected')
        rate = tensor.fscalar('rate')
        momentum = tensor.fscalar('momentum')

        ##Compute outputs given inputs
        self.get_output = theano.function([],
                                          updates = [(self.outputs,
                                                        tensor.nnet.sigmoid(
                                                            tensor.dot(
                                                               self.inputs,
                                                               self.weights)))],
                                          name='get_output')

        ##Compute error values given errors of previous layer
        if self.output:
            self.find_errors = theano.function([exp],
                                               updates = [(self.errors,
                                                           self.outputs *
                                                           (1 - self.outputs)
                                                           * exp)],
                                               name='find_errors',
                                               allow_input_downcast=True)
        else:
            self.find_errors = theano.function([],
                                               updates = [(self.errors,
                                                          self.outputs *
                                                          (1 - self.outputs) *
                                             tensor.dot(next_layer.errors,
                                                        next_layer.weights.T))],
                                           name='find_errors')

        ##Compute the change to the weight vector using stochastic gradient
        ##descent with momentum
        self.train_compute = theano.function([rate, momentum],
                                      updates = [(self.delta_weights,
                                                  self.delta_weights *
                                                  momentum +
                                            theano.tensor.dot(self.inputs.T,
                                                        (rate * self.errors)))],
                                     name='train_compute',
                                     allow_input_downcast=True)

        ##Adjust weights using the delta_w computed in train_compute
        self.adjust = theano.function([], updates=[(self.weights, self.weights +
                                                    self.delta_weights)],
                                      name='adjust')

        ##Drop a number of nodes roughly equal to rate/output_size
        self.dropout = theano.function([rate], updates = [(self.outputs,
                                            tensor.switch(
                                                self.random.binomial(size=(1,
                                                    self.output_size),
                                                    p=rate), self.outputs /
                                                             rate, 0))],
                                       name='dropout',
                                       allow_input_downcast=True)

def find_Y(X_shared, Y_shared, sigma_shared, N, output_dims, n_epochs,
           initial_lr, final_lr, lr_switch, init_stdev, initial_momentum,
           final_momentum, momentum_switch, metric, verbose=0):
    """Optimize cost wrt Y"""
    # Optimization hyperparameters
    initial_lr = np.array(initial_lr, dtype=floath)
    final_lr = np.array(final_lr, dtype=floath)
    initial_momentum = np.array(initial_momentum, dtype=floath)
    final_momentum = np.array(final_momentum, dtype=floath)

    lr = T.fscalar('lr')
    lr_shared = theano.shared(initial_lr)

    momentum = T.fscalar('momentum')
    momentum_shared = theano.shared(initial_momentum)

    # Y velocities
    Yv = T.fmatrix('Yv')
    Yv_shared = theano.shared(np.zeros((N, output_dims), dtype=floath))

    # Cost
    X = T.fmatrix('X')
    sigma = T.fvector('sigma')
    Y = T.fmatrix('Y')

    cost = cost_var(X, Y, sigma, metric)

    # Setting update for Y velocities
    grad_Y = T.grad(cost, Y)

    updates = [(Yv_shared, momentum*Yv - lr*grad_Y)]
    givens = {X: X_shared, sigma: sigma_shared, Y: Y_shared, Yv: Yv_shared,
              lr: lr_shared, momentum: momentum_shared}

    update_Yv = theano.function([], cost, givens=givens, updates=updates)

    # Setting update for Y
    givens = {Y: Y_shared, Yv: Yv_shared}
    updates = [(Y_shared, Y + Yv)]

    update_Y = theano.function([], [], givens=givens, updates=updates)

    # Momentum-based gradient descent
    for epoch in range(n_epochs):
        if epoch == lr_switch:
            lr_shared.set_value(final_lr)
        if epoch == momentum_switch:
            momentum_shared.set_value(final_momentum)

        c = update_Yv()
        update_Y()
        if verbose:
            print('Epoch: {0}. Cost: {1:.6f}.'.format(epoch + 1, float(c)))

    return np.array(Y_shared.get_value())

  def train(self, data1, data2, similarities, miniBatchSize=20, epochs=200):
    nrMiniBatches = len(data1) / miniBatchSize
    miniBatchIndex = T.lscalar()
    momentum = T.fscalar()
    learningRate = T.fscalar()

    learningRateMiniBatch = np.float32(self.learningRate / miniBatchSize)
    print "learningRateMiniBatch in similarity net"
    print learningRateMiniBatch

    net = self._trainRBM(data1, data2)

    data1  = theano.shared(np.asarray(data1,dtype=theanoFloat))
    data2  = theano.shared(np.asarray(data2,dtype=theanoFloat))
    similarities = theano.shared(np.asarray(similarities,dtype=theanoFloat))

    # The mini-batch data is a matrix
    x = T.matrix('x', dtype=theanoFloat)
    y = T.matrix('y', dtype=theanoFloat)
    self.x = x
    self.y = y

    z = T.vector('z', dtype=theanoFloat)

    trainer = Trainer(x, y, net)
    self.trainer = trainer

    # error = T.sum(T.sqr(trainer.output-z))
    error = T.sum(T.nnet.binary_crossentropy(trainer.output, z))

    updates = self.buildUpdates(trainer, error, learningRate, momentum)

    # Now you have to define the theano function
    discriminativeTraining = theano.function(
      inputs=[miniBatchIndex, learningRate, momentum],
      outputs=[trainer.output, trainer.cos],
      updates=updates,
      givens={
            x: data1[miniBatchIndex * miniBatchSize:(miniBatchIndex + 1) * miniBatchSize],
            y: data2[miniBatchIndex * miniBatchSize:(miniBatchIndex + 1) * miniBatchSize],
            z: similarities[miniBatchIndex * miniBatchSize:(miniBatchIndex + 1) * miniBatchSize],
            })

    for epoch in xrange(epochs):
      print "epoch", epoch
      momentum = np.float32(min(np.float32(0.5) + epoch * np.float32(0.1),
                       np.float32(0.95)))

      for miniBatch in xrange(nrMiniBatches):
        output, cos = discriminativeTraining(miniBatch, learningRateMiniBatch, momentum)

    print trainer.w.get_value()
    print trainer.b.get_value()

    def build_finetune_functions(self, train_shared_xy, valid_shared_xy, batch_size):

        #print len(self.layers)
        #print [T.shape(l.W)[0] for l in self.layers]

        (train_set_x, train_set_y) = train_shared_xy
        (valid_set_x, valid_set_y) = valid_shared_xy

        #print T.shape(train_set_x), T.shape(train_set_y)

        index = T.lscalar('index')  # index to a [mini]batch
        learning_rate = T.fscalar('learning_rate')
        momentum = T.fscalar('momentum')

        # compute the gradients with respect to the model parameters
        gparams = T.grad(self.finetune_cost, self.params)

        # compute list of fine-tuning updates
        updates = collections.OrderedDict()
        for dparam, gparam in zip(self.delta_params, gparams):
            updates[dparam] = momentum * dparam - gparam*learning_rate
        for dparam, param in zip(self.delta_params, self.params):
            updates[param] = param + updates[dparam]

        if self.max_col_norm is not None:
            for i in xrange(self.hidden_layers_number):
                W = self.layers[i].W
                if W in updates:
                    updated_W = updates[W]
                    col_norms = T.sqrt(T.sum(T.sqr(updated_W), axis=0))
                    desired_norms = T.clip(col_norms, 0, self.max_col_norm)
                    updates[W] = updated_W * (desired_norms / (1e-7 + col_norms))

        train_fn = theano.function(inputs=[index, theano.Param(learning_rate, default = 0.0001),
              theano.Param(momentum, default = 0.5)],
              outputs=self.errors,
              updates=updates,
              givens={
                self.x: train_set_x[index * batch_size:
                                    (index + 1) * batch_size],
                self.y: train_set_y[index * batch_size:
                                    (index + 1) * batch_size]})

        valid_fn = theano.function(inputs=[index],
              outputs=self.errors,
              givens={
                self.x: valid_set_x[index * batch_size:
                                    (index + 1) * batch_size],
                self.y: valid_set_y[index * batch_size:
                                    (index + 1) * batch_size]})

        return train_fn, valid_fn

    def __init__(self, input_dim, emb_dim, n_senses, W_w_f, lambdaH, lambdaL2, adjust, lambdaF):
        super().__init__(input_dim, emb_dim, n_senses, W_w_f, lambdaF)
        self.Wb = zeros((input_dim+1, n_senses), name="Wb")  # sense- and word-specific bias
        self.H = TT.fscalar()  # entropy
        self.L2 = TT.fscalar()
        self.lambdaH = lambdaH  # weight for entropy regularizer
        self.lambdaL2 = lambdaL2  # weight for L2 regularizer

        if lambdaL2 == 0.:
            self.L2 = 0.
        else:
            self.L2 = TT.sum(TT.sqr(self.W_w)) + TT.sum(TT.sqr(self.W_c))
        self.adjust = adjust

    def __init__(self, game_params, arch_params, solver_params, trained_model, sn_dir):

        params=[None, None]

        if trained_model[0]:
            params[0] = common.load_params(trained_model[0])

        if trained_model[1]:
            params[1] = common.load_params(trained_model[1])

        self.lr_func = []
        self.lr_func.append(create_learning_rate_func(solver_params['controler_0']))
        self.lr_func.append(create_learning_rate_func(solver_params['controler_1']))

        self.x_host_0 = tt.fvector('x_host_0')
        self.v_host_0 = tt.fvector('v_host_0')
        self.x_target_0 = tt.fvector('x_target_0')
        self.v_target_0 = tt.fvector('v_target_0')
        self.x_mines_0 = tt.fmatrix('x_mines_0')
        self.mines_map = tt.fmatrix('mines_map')
        self.time_steps = tt.fvector('time_steps')
        self.force = tt.fmatrix('force')
        self.n_steps_0 = tt.iscalar('n_steps_0')
        self.n_steps_1 = tt.iscalar('n_steps_1')
        self.lr = tt.fscalar('lr')
        self.goal_1 = tt.fvector('goal_1')
        self.trnsprnt = tt.fscalar('trnsprnt')
        self.rand_goals = tt.fmatrix('rand_goals')
        self.game_params = game_params
        self.arch_params = arch_params
        self.solver_params = solver_params
        self.sn_dir = sn_dir

        self.model = CONTROLLER(self.x_host_0,
                                self.v_host_0,
                                self.x_target_0,
                                self.v_target_0,
                                self.x_mines_0,
                                self.mines_map,
                                self.time_steps,
                                self.force,
                                self.n_steps_0,
                                self.n_steps_1,
                                self.lr,
                                self.goal_1,
                                self.trnsprnt,
                                self.rand_goals,
                                self.game_params,
                                self.arch_params,
                                self.solver_params,
                                params)

    def compile(self):
        """ compile theano functions
        """
        self.t_L1_reg = T.fscalar('L1_reg')
        self.t_L2_reg = T.fscalar('L2_reg')
        self.t_learning_rate = T.fscalar('learning_rate')
        cost = self.loss + self.t_L1_reg * self.L1 + self.t_L2_reg * self.L2_sqr

        self.parameter_updates = [(param, param - self.t_learning_rate * T.grad(cost, param)) for param in self.params]

        self._tf_train = theano.function(inputs=[self.input, self.true_output, self.t_L1_reg, self.t_L2_reg, self.t_learning_rate],
                                         outputs=[self.loss], allow_input_downcast=True, updates=self.parameter_updates)
        self._tf_infer = theano.function(inputs=[self.input], outputs=[self.output], allow_input_downcast=True)
        self._tf_evaluate = theano.function(inputs=[self.input, self.true_output], outputs=[self.loss],
                                            allow_input_downcast=True)

    def get_adagrad_trainer(self):
        """ Returns an Adagrad (Duchi et al. 2010) trainer using a learning rate.
        """
        batch_x = T.fmatrix('batch_x')
        batch_y = T.ivector('batch_y')
        learning_rate = T.fscalar('lr')  # learning rate to use
        # compute the gradients with respect to the model parameters
        gparams = T.grad(self.mean_cost, self.params)

        # compute list of weights updates
        updates = OrderedDict()
        for accugrad, param, gparam in zip(self._accugrads, self.params, gparams):
            # c.f. Algorithm 1 in the Adadelta paper (Zeiler 2012)
            
            agrad = accugrad + gparam * gparam
            dx = - (learning_rate / T.sqrt(agrad + self._eps)) * gparam
            updates[param] = param + dx
            updates[accugrad] = agrad

        train_fn = theano.function(inputs=[theano.Param(batch_x), 
            theano.Param(batch_y),
            theano.Param(learning_rate)],
            outputs=self.mean_cost,
            updates=updates,
            givens={self.x: batch_x, self.y: batch_y})

        return train_fn

    def cmp(a_shp, b_shp):
        a = tensor.fmatrix()
        b = tensor.fmatrix()
        scalar = tensor.fscalar()
        av = my_rand(*a_shp)
        bv = my_rand(*b_shp)

        f = theano.function(
                [a, b],
                tensor.dot(a, b) * numpy.asarray(4, 'float32'),
                mode=mode_with_gpu)
        f2 = theano.function(
                [a, b],
                tensor.dot(a, b) * numpy.asarray(4, 'float32'))
        t = f.maker.fgraph.toposort()
        assert len(t) == 4
        assert isinstance(t[0].op, tcn.GpuFromHost)
        assert isinstance(t[1].op, tcn.GpuFromHost)
        assert isinstance(t[2].op, tcn.blas.GpuDot22Scalar)
        assert isinstance(t[3].op, tcn.HostFromGpu)
        assert numpy.allclose(f(av, bv), f2(av, bv))

        f = theano.function([a, b, scalar], tensor.dot(a, b) * scalar,
                mode=mode_with_gpu)
        f2 = theano.function([a, b, scalar], tensor.dot(a, b) * scalar)
        t = f.maker.fgraph.toposort()
        assert len(t) == 4
        assert isinstance(t[0].op, tcn.GpuFromHost)
        assert isinstance(t[1].op, tcn.GpuFromHost)
        assert isinstance(t[2].op, tcn.blas.GpuDot22Scalar)
        assert isinstance(t[3].op, tcn.HostFromGpu)
        assert numpy.allclose(f(av, bv, 0.5), f2(av, bv, 0.5))