Python tensor.iscalar函数代码示例

    def build_model(self, train_set, test_set, validation_set):
        """
        Building the model should be done prior to training. It will implement the training, testing and validation
        functions.
        This method should be called from any subsequent inheriting model.
        :param loss: The loss funciton applied to training (cf. updates.py), e.g. mse.
        :param update: The update function (optimization framework) used for training (cf. updates.py), e.g. sgd.
        :param update_args: The args for the update function applied to training, e.g. (0.001,).
        """
        print "### BUILDING MODEL ###"

        self.train_args = {}
        self.train_args['inputs'] = OrderedDict({})
        self.train_args['outputs'] = OrderedDict({})

        self.test_args = {}
        self.test_args['inputs'] = OrderedDict({})
        self.test_args['outputs'] = OrderedDict({})

        self.validate_args = {}
        self.validate_args['inputs'] = OrderedDict({})
        self.validate_args['outputs'] = OrderedDict({})

        self.sym_index = T.iscalar('index')
        self.sym_batchsize = T.iscalar('batchsize')
        self.sym_lr = T.scalar('learningrate')
        self.batch_slice = slice(self.sym_index * self.sym_batchsize, (self.sym_index + 1) * self.sym_batchsize)

        self.sh_train_x = theano.shared(np.asarray(train_set[0], dtype=theano.config.floatX), borrow=True)
        self.sh_train_t = theano.shared(np.asarray(train_set[1], dtype=theano.config.floatX), borrow=True)
        self.sh_test_x = theano.shared(np.asarray(test_set[0], dtype=theano.config.floatX), borrow=True)
        self.sh_test_t = theano.shared(np.asarray(test_set[1], dtype=theano.config.floatX), borrow=True)
        if validation_set is not None:
            self.sh_valid_x = theano.shared(np.asarray(validation_set[0], dtype=theano.config.floatX), borrow=True)
            self.sh_valid_t = theano.shared(np.asarray(validation_set[1], dtype=theano.config.floatX), borrow=True)

    def getMinibatchTrainer(self, costFunction, variableToData, rms=True):
        # define params        
        lr = T.fscalar('lr')    
        start = T.iscalar('start')
        end = T.iscalar('end')

        # Get the cost and its parameters.
        params = costFunction[0]
        cost = costFunction[1]

        # Get the updates.
        updates = self.getUpdates(cost, params, lr, rms)
        # Store all state variables.
        stateManager = StateManager([u[0] for u in updates])

        # Slice the data
        givens = dict()
        for item in variableToData:
            givens[item.variable] = item.slice(start,end)
        
                
        # Define the training function.
        train_model = theano.function(inputs=[theano.Param(start, borrow = True), 
                                              theano.Param(end, borrow=True), 
                                              theano.Param(lr, borrow=True)],
                                        outputs=theano.Out(cost, borrow=True),
                                        updates=updates,
                                        givens=givens)

        
        return train_model, stateManager

    def f_train(self, t_x, t_corrupt = 0.2, t_rate = 0.1):
        """ return training function of the following signiture:
        input:
            lower and upper indices on training data
            alternative training data
        return:
            likelihood based cost
            square distance between training data and prediction
        
        """
        x = T.matrix('x')     # pipe data through this symble
        q = self.t_corrupt(x, t_corrupt)
        h = self.t_encode(q)
        z = self.t_decode(h)

        L = - T.sum(x * T.log(z) + (1 - x) * T.log(1 - z), axis=1)
        cost = T.mean(L)    # to be returned

        dist = T.mean(T.sqrt(T.sum((x - z) ** 2, axis = 1)))    # to be returned

        grad = T.grad(cost, self.parm)

        diff = [(p, p - t_rate * g) for p, g in zip(self.parm, grad)]

        t_fr = T.iscalar()
        t_to = T.iscalar()
        return theano.function(
            [t_fr, t_to],
            [cost, dist],
            updates = diff,
            givens = {x : t_x[t_fr:t_to]},
            name = "DA_trainer")

 def getTrainer(self,lossType="NLL"):
   '''
   return a function to do MBSGD on (trainX,trainY)
   '''
   trainY = T.ivector('y')
   alpha = T.dscalar('a')
   lowIdx = T.iscalar()
   highIdx = T.iscalar()
   trainX = T.matrix()
   if lossType=="aNLL":
     loss = self.aNLL(trainY)
   elif lossType=='MSE':
     loss = self.MSE(trainY)
   else:
     loss = self.NLL(trainY)
   dW = T.grad(cost = loss, wrt = self.W)
   db = T.grad(cost = loss, wrt = self.b)
   updates = [(self.W,self.W - alpha * dW), (self.b,self.b - alpha * db)]
   trainer = theano.function(
       inputs = [trainX,trainY,alpha],
       outputs = loss,
       updates=updates,
       givens = {
         self.input : trainX,
       },
       allow_input_downcast=True
     )
   return trainer

def SimFnIdx(fnsim, embeddings, leftop, rightop):
    """
    This function returns a Theano function to measure the similarity score
    for a given triplet of entity indexes.

    :param fnsim: similarity function (on Theano variables).
    :param embeddings: an Embeddings instance.
    :param leftop: class for the 'left' operator.
    :param rightop: class for the 'right' operator.
    """
    embedding, relationl, relationr = parse_embeddings(embeddings)

    # Inputs
    idxo = T.iscalar('idxo')
    idxr = T.iscalar('idxr')
    idxl = T.iscalar('idxl')
    # Graph
    lhs = (embedding.E[:, idxl]).reshape((1, embedding.D))
    rhs = (embedding.E[:, idxr]).reshape((1, embedding.D))
    rell = (relationl.E[:, idxo]).reshape((1, relationl.D))
    relr = (relationr.E[:, idxo]).reshape((1, relationr.D))
    simi = fnsim(leftop(lhs, rell), rightop(rhs, relr))
    """
    Theano function inputs.
    :input idxl: index value of the 'left' member.
    :input idxr: index value of the 'right' member.
    :input idxo: index value of the relation member.

    Theano function output.
    :output simi: score value.
    """
    return theano.function([idxl, idxr, idxo], [simi],
            on_unused_input='ignore')

def multMatVect(v, A, m1, B, m2):
    # TODO : need description for parameter and return
    """
    Multiply the first half of v by A with a modulo of m1 and the second half
    by B with a modulo of m2.

    Notes
    -----
    The parameters of dot_modulo are passed implicitly because passing them
    explicitly takes more time than running the function's C-code.

    """
    if multMatVect.dot_modulo is None:
        A_sym = tensor.lmatrix('A')
        s_sym = tensor.ivector('s')
        m_sym = tensor.iscalar('m')
        A2_sym = tensor.lmatrix('A2')
        s2_sym = tensor.ivector('s2')
        m2_sym = tensor.iscalar('m2')
        o = DotModulo()(A_sym, s_sym, m_sym, A2_sym, s2_sym, m2_sym)
        multMatVect.dot_modulo = function(
            [A_sym, s_sym, m_sym, A2_sym, s2_sym, m2_sym], o, profile=False)

    # This way of calling the Theano fct is done to bypass Theano overhead.
    f = multMatVect.dot_modulo
    f.input_storage[0].storage[0] = A
    f.input_storage[1].storage[0] = v[:3]
    f.input_storage[2].storage[0] = m1
    f.input_storage[3].storage[0] = B
    f.input_storage[4].storage[0] = v[3:]
    f.input_storage[5].storage[0] = m2
    f.fn()
    r = f.output_storage[0].storage[0]

    return r

def RankRightFnIdx_filtered(fnsim, embeddings, leftop, rightop, subtensorspec=None):
    """
    This function returns a Theano function to measure the similarity score of
    all 'right' entities given couples of relation and 'left' entities (as
    index values).
    """
    embedding, relationl, relationr = parse_embeddings(embeddings)
    # Inputs
    idxl, idxo = T.iscalar('idxl'), T.iscalar('idxo')
    rightparts = T.ivector('rightparts')
    # Graph
    lhs = (embedding.E[:, idxl]).reshape((1, embedding.D))              # lhs: 1xD vector containing the embedding of idxl
    if subtensorspec is not None:
        # We compute the score only for a subset of entities
        rhs = (embedding.E[:, :subtensorspec]).T
    else:
        rhs = embedding.E.T                                             # rhs: NxD embedding matrix

    rhs = rhs[rightparts, :]                                            # select the right parts not appearing
                                                                        # in the train/valid/test sets

    rell = (relationl.E[:, idxo]).reshape((1, relationl.D))             # rell: 1xD vector containing the embedding of idxo (relationl)
    relr = (relationr.E[:, idxo]).reshape((1, relationr.D))             # relr: 1xD vector containing the embedding of idxo (relationr)

    tmp = leftop(lhs, rell)                                             # a = rell(lhs)
                                                                        # b = relr(rhs)

    simi = fnsim(tmp.reshape((1, tmp.shape[1])), rightop(rhs, relr))    # simi = fnsim(a, b)
    return theano.function([idxl, idxo, rightparts], [simi], on_unused_input='ignore')

def RankRightFnIdx_Schema(fnsim, embeddings, prior, leftop, rightop, subtensorspec=None):
    embedding, relationl, relationr = parse_embeddings(embeddings)

    # Inputs
    idxl, idxo = T.iscalar('idxl'), T.iscalar('idxo')
    g = T.matrix('g')

    # Graph
    lhs = (embedding.E[:, idxl]).reshape((1, embedding.D))              # lhs: 1xD vector containing the embedding of idxl

    if subtensorspec is not None:
        # We compute the score only for a subset of entities
        rhs = (embedding.E[:, :subtensorspec]).T
    else:
        rhs = embedding.E.T                                             # rhs: NxD embedding matrix

    rell = (relationl.E[:, idxo]).reshape((1, relationl.D))             # rell: 1xD vector containing the embedding of idxo (relationl)
    relr = (relationr.E[:, idxo]).reshape((1, relationr.D))             # relr: 1xD vector containing the embedding of idxo (relationr)

    tmp = leftop(lhs, rell)                                             # a = rell(lhs)
                                                                        # b = relr(rhs)

    # Negative Energy
    simi = fnsim(tmp.reshape((1, tmp.shape[1])), rightop(rhs, relr))    # simi = fnsim(a, b)

    pen_simi = g[0, :].T * prior.P[idxo, 0].T + g[1, :].T * prior.P[idxo, 1].T
    simi = simi - pen_simi

    return theano.function([idxl, idxo, g], [simi], on_unused_input='ignore')

def compile_bn(data_set, model, make_updates):
    """
    データをsharedにして、modelとoptimizerを使ってcomputational graphを作って、
    コンパイルする。
    
    Parameters
    -----------
    data_set : list of numpy.ndarray
        feature_vec : ndarray
            (n_pixels, D, n_tensors)
        gt_vec : ndarray
            (n_pixels, D)
        test_feature_vec, test_gt_vec
    model : models.Rcn1layerとか
    optimizer : optimizers.SGDとか
    
    """

    s_input, s_target, s_test_input, s_test_target = share_data_sets(*data_set)
        
    nn, obj, train_mse, model_updates, model_param_l = model.make_graph_train()
    test_mse, test_out = model.make_graph_test()
    
    updates, opt_param_list = make_updates(loss=obj, param_list=nn.param_l)

    i_batch = T.iscalar("i_batch")
    index_list = T.ivector("index_list")
    batch_size = T.iscalar("batch_size")
    
    od = OrderedDict()
    for k, e in updates.items() + model_updates.items():
        od[k] = e

    f_train = theano.function(
        inputs=[i_batch, index_list, batch_size]+opt_param_list+model_param_l,
        updates=od,
        givens=[(nn.x_t3, s_input[index_list[i_batch*batch_size: i_batch*batch_size + batch_size]]),
                (nn.t_mat, s_target[index_list[i_batch*batch_size: i_batch*batch_size + batch_size]])],
        on_unused_input='warn')
                
    f_training_error = theano.function(
        inputs=[i_batch, index_list, batch_size]+model_param_l,
        outputs=[train_mse],
        givens=[(nn.x_t3, s_input[index_list[i_batch*batch_size: i_batch*batch_size + batch_size]]),
                (nn.t_mat, s_target[index_list[i_batch*batch_size: i_batch*batch_size + batch_size]])],
        on_unused_input='warn')
                
    f_test_error = theano.function(
        inputs=[i_batch, index_list, batch_size],
        outputs=[test_mse],
        givens=[(nn.x_t3, s_test_input[index_list[i_batch*batch_size: i_batch*batch_size + batch_size]]),
                (nn.t_mat, s_test_target[index_list[i_batch*batch_size: i_batch*batch_size + batch_size]])])
                
    f_output = theano.function(
        inputs=[nn.x_t3],
        outputs=[test_out])

    result = [f_train, f_training_error, f_test_error, f_output, s_input,
              s_target, s_test_input, s_test_target, nn.param_l]
    return result

    def test_compute_lnZ(self):
        v = T.matrix('v')
        z = T.iscalar('z')

        V = cartesian([(0, 1)] * self.input_size, dtype=config.floatX)
        #H = cartesian([(0, 1)] * self.hidden_size, dtype=config.floatX)

        # We simulate having an infinite number of hidden units by adding lot of hidden units with parameters set to 0.
        nb_hidden_units_to_add = 10000
        model = iRBM(input_size=self.model.input_size,
                     hidden_size=self.model.hidden_size + nb_hidden_units_to_add,
                     beta=self.model.beta.get_value())

        model.W.set_value(np.r_[self.model.W.get_value(), np.zeros((nb_hidden_units_to_add, model.input_size), dtype=theano.config.floatX)])
        model.b.set_value(np.r_[self.model.b.get_value(), np.zeros((nb_hidden_units_to_add,), dtype=theano.config.floatX)])
        model.c.set_value(self.model.c.get_value())

        v = T.matrix('v')
        z = T.iscalar('z')
        F_vz = theano.function([v, z], model.F(v, z))

        energies = []
        for z in range(1, model.hidden_size+1):
            energies.append(F_vz(V, z))

        lnZ = logsumexp(-np.array(energies)).eval()

        lnZ_using_free_energy = theano.function([v], logsumexp(-self.model.free_energy(v)))
        assert_almost_equal(lnZ_using_free_energy(V), lnZ, decimal=5)  # decimal=5 needed for float32

 def compile_functions(self, opt, **args):
     print '... compiling training functions'
     
     gen_cost, gen_show_cost, dis_cost, cost_pfake, cost_ptrue = self.get_cost()
        
     self.opt = opt
     gen_updates = self.opt.get_updates(gen_cost, self.gen_params)
     dis_updates = self.opt.get_updates(dis_cost, self.dis_params)
        
     self.get_noise = theano.function([],
                                      self.theano_rng.uniform(size=(self.batch_size, self.num_z), 
                                             low=-1, high=1)
                                      ) 
     start_index = T.iscalar('start_index')
     end_index = T.iscalar('end_index')
     
     if self.uint8_data:
         given_train_x = T.cast(self.shared_train[start_index:end_index], dtype='float32')
     else:
         given_train_x = self.shared_train[start_index:end_index]
         
     self.train_gen_model = theano.function(
         [self.z],
         gen_show_cost,
         updates=gen_updates,
         )
     
     self.train_dis_model = theano.function(
         [start_index, end_index, self.z],
         [cost_pfake, cost_ptrue],
         updates=dis_updates,
         givens={self.x: given_train_x}
         )

def multMatVect(v, A, m1, B, m2):
    """
    multiply the first half of v by A with a modulo of m1
    and the second half by B with a modulo of m2

    Note: The parameters of dot_modulo are passed implicitly because passing
    them explicitly takes more time then running the function's C-code.
    """
    if multMatVect.dot_modulo is None:
        A_sym = tensor.lmatrix("A")
        s_sym = tensor.ivector("s")
        m_sym = tensor.iscalar("m")
        A2_sym = tensor.lmatrix("A2")
        s2_sym = tensor.ivector("s2")
        m2_sym = tensor.iscalar("m2")
        o = DotModulo()(A_sym, s_sym, m_sym, A2_sym, s2_sym, m2_sym)
        multMatVect.dot_modulo = function([A_sym, s_sym, m_sym, A2_sym, s2_sym, m2_sym], o)

    # This way of calling the Theano fct is done to bypass Theano overhead.
    f = multMatVect.dot_modulo
    f.input_storage[0].storage[0] = A
    f.input_storage[1].storage[0] = v[:3]
    f.input_storage[2].storage[0] = m1
    f.input_storage[3].storage[0] = B
    f.input_storage[4].storage[0] = v[3:]
    f.input_storage[5].storage[0] = m2
    f.fn()
    r = f.output_storage[0].storage[0]

    return r

def init_nnet(W, n_classes, vec_dim):
    """Initialize neural network.

    Args:
      W (theano.shared): embedding matrix
      n_classes: number of classes to be predicted
      vec_dim: dimensionality of the embeddings

    """
    w_idx = TT.iscalar(name="w_idx")
    y_gold = TT.iscalar(name="y_gold")
    embs = W[w_idx]
    Theta = theano.shared(value=ORTHOGONAL.sample((n_classes, vec_dim)),
                          name="Theta")
    beta = theano.shared(value=HE_UNIFORM.sample((1, n_classes)), name="beta")
    y_probs = TT.nnet.softmax(TT.dot(Theta, embs.T).flatten() + beta).flatten()
    params = [Theta]
    cost = -TT.mean(TT.log(y_probs[y_gold]))
    updates = sgd_updates_adadelta(params, cost)
    train = theano.function([w_idx, y_gold], cost, updates=updates)
    y_pred = TT.argmax(y_probs)
    y_score = y_probs[y_pred]
    predict = theano.function([w_idx], (y_pred, y_score))
    acc = TT.eq(y_gold, y_pred)
    validate = theano.function([w_idx, y_gold], acc)
    return (train, validate, predict, params)

def build_model(shared_params, options, other_params):
    """
    Build the complete neural network model and return the symbolic variables
    """
    # symbolic variables
    x = tensor.matrix(name="x", dtype=floatX)
    y1 = tensor.iscalar(name="y1")
    y2 = tensor.iscalar(name="y2")

    # lstm cell
    (ht, ct) = lstm_cell(x, shared_params, options, other_params)  # gets the ht, ct
    # softmax 1 i.e. frame type prediction
    activation = tensor.dot(shared_params['softmax1_W'], ht).transpose() + shared_params['softmax1_b']
    frame_pred = tensor.nnet.softmax(activation) # .transpose()

    # softmax 2 i.e. gesture class prediction
    #

    # predicted probability for frame type
    f_pred_prob = theano.function([x], frame_pred, name="f_pred_prob")
    # predicted frame type
    f_pred = theano.function([x], frame_pred.argmax(), name="f_pred")

    # cost
    cost = ifelse(tensor.eq(y1, 1), -tensor.log(frame_pred[0, 0] + options['log_offset'])
                  * other_params['begin_cost_factor'],
                  ifelse(tensor.eq(y1, 2), -tensor.log(frame_pred[0, 1] + options['log_offset'])
                         * other_params['end_cost_factor'],
                         ifelse(tensor.eq(y1, 3), -tensor.log(frame_pred[0, 2] + options['log_offset']),
                                tensor.abs_(tensor.log(y1)))), name='ifelse_cost')

    # function for output of the currect lstm cell and softmax prediction
    f_model_cell_output = theano.function([x], (ht, ct, frame_pred), name="f_model_cell_output")
    # return the model symbolic variables and theano functions
    return x, y1, y2, f_pred_prob, f_pred, cost, f_model_cell_output

    def __init__(self, in_size, out_size, dim_y, dim_pos, hidden_size_encoder, hidden_size_decoder, cell = "gru", optimizer = "rmsprop", p = 0.5, num_sents = 1):

        self.X = T.matrix("X")
        self.Y_y = T.matrix("Y_y")
        self.Y_pos = T.matrix("Y_pos")
        self.in_size = in_size
        self.out_size = out_size
        self.dim_y = dim_y
        self.dim_pos = dim_pos
        self.hidden_size_encoder = hidden_size_encoder
        self.hidden_size_decoder = hidden_size_decoder
        self.cell = cell
        self.drop_rate = p
        self.num_sents = num_sents
        self.is_train = T.iscalar('is_train') # for dropout
        self.batch_size = T.iscalar('batch_size') # for mini-batch training
        self.mask = T.matrix("mask")
        self.mask_y = T.matrix("mask_y")
        self.optimizer = optimizer
        print "seq2seq out size ", self.out_size
        
        if self.out_size == self.dim_y + self.dim_pos:
            print "size right !"
        self.define_layers()
        self.define_train_test_funcs()