Python ifelse.ifelse函数代码示例

 def build(self, output, tparams=None, BNparams=None):
     if self.BN_mode:
         self.BN_eps = npt(self.BN_eps)
         if not hasattr(self, 'BN_mean'):
             self.BN_mean = T.mean(output)
         if not hasattr(self, 'BN_std'):
             m2 = (1 + 1 / (T.prod(output.shape) - 1)).astype(floatX)
             self.BN_std = T.sqrt(m2 * T.var(output) + self.BN_eps)
         if self.BN_mode == 2:
             t_mean = T.mean(output, axis=[0, 2, 3], keepdims=True)
             t_var = T.var(output, axis=[0, 2, 3], keepdims=True)
             BN_mean = BNparams[p_(self.prefix, 'mean')].dimshuffle(
                 'x', 0, 'x', 'x')
             BN_std = BNparams[p_(self.prefix, 'std')].dimshuffle(
                 'x', 0, 'x', 'x')
             output = ifelse(
                 self.training,
                 (output - t_mean) / T.sqrt(t_var + self.BN_eps),
                 (output - BN_mean) / BN_std)
             output *= tparams[p_(self.prefix, 'BN_scale')].dimshuffle(
                 'x', 0, 'x', 'x')
             output += tparams[p_(self.prefix, 'BN_shift')].dimshuffle(
                 'x', 0, 'x', 'x')
         elif self.BN_mode == 1:
             t_mean = T.mean(output)
             t_var = T.var(output)
             output = ifelse(
                 self.training,
                 (output - t_mean) / T.sqrt(t_var + self.BN_eps),
                 ((output - BNparams[p_(self.prefix, 'mean')])
                  / BNparams[p_(self.prefix, 'std')]))
             output *= tparams[p_(self.prefix, 'BN_scale')]
             output += tparams[p_(self.prefix, 'BN_shift')]
     self.output = self.activation(output)

def get_sensi_speci(y_hat, y):
    # y_hat = T.concatenate(T.sum(input=y_hat[:, 0:2], axis=1), T.sum(input=y_hat[:, 2:], axis=1))
    y_hat = T.stacklists([y_hat[:, 0] + y_hat[:, 1], y_hat[:, 2] + y_hat[:, 3] + y_hat[:, 4]]).T
    y_hat = T.argmax(y_hat)

    tag = 10 * y_hat + y
    tneg = T.cast((T.shape(tag[(T.eq(tag, 0.)).nonzero()]))[0], config.floatX)
    fneg = T.cast((T.shape(tag[(T.eq(tag, 1.)).nonzero()]))[0], config.floatX)
    fpos = T.cast((T.shape(tag[(T.eq(tag, 10.)).nonzero()]))[0], config.floatX)
    tpos = T.cast((T.shape(tag[(T.eq(tag, 11.)).nonzero()]))[0], config.floatX)



    # assert fneg + fneg + fpos + tpos == 1380
    # tneg.astype(config.floatX)
    # fneg.astype(config.floatX)
    # fpos.astype(config.floatX)
    # tpos.astype(config.floatX)

    speci = ifelse(T.eq((tneg + fpos), 0), np.float64(float('inf')), tneg / (tneg + fpos))
    sensi = ifelse(T.eq((tpos + fneg), 0), np.float64(float('inf')), tpos / (tpos + fneg))

    # keng die!!!
    # if T.eq((tneg + fpos), 0):
    #     speci = float('inf')
    # else:
    #     speci = tneg // (tneg + fpos)
    # if T.eq((tpos + fneg), 0.):
    #     sensi = float('inf')
    # else:
    #     sensi = tpos // (tpos + fneg)

    # speci.astype(config.floatX)
    # sensi.astype(config.floatX)
    return [sensi, speci]

  def __init__(self, factor=numpy.sqrt(2), decay=1.0, min_factor=None, padding=False, **kwargs):
    super(ConvFMPLayer, self).__init__(**kwargs)
    if min_factor is None:
      min_factor = factor
    factor = T.maximum(factor * (decay ** self.network.epoch), numpy.float32(min_factor))
    sizes_raw = self.source.output_sizes

    # handle size problems
    if not padding:
      padding = T.min(self.source.output_sizes / factor) <= 0
      padding = theano.printing.Print(global_fn=maybe_print_pad_warning)(padding)

    fixed_sizes = T.maximum(sizes_raw, T.cast(T.as_tensor(
      [factor + self.filter_height - 1, factor + self.filter_width - 1]), 'float32'))
    sizes = ifelse(padding, fixed_sizes, sizes_raw)
    X_size = T.cast(T.max(sizes, axis=0), "int32")

    def pad_fn(x_t, s):
      x = T.alloc(numpy.cast["float32"](0), X_size[0], X_size[1], self.X.shape[3])
      x = T.set_subtensor(x[:s[0], :s[1]], x_t[:s[0], :s[1]])
      return x

    fixed_X, _ = theano.scan(pad_fn, [self.X.dimshuffle(2, 0, 1, 3), T.cast(sizes_raw, "int32")])
    fixed_X = fixed_X.dimshuffle(1, 2, 0, 3)
    self.X = ifelse(padding, T.unbroadcast(fixed_X, 3), self.X)

    conv_out = CuDNNConvHWBCOpValidInstance(self.X, self.W, self.b)
    conv_out_sizes = self.conv_output_size_from_input_size(sizes)
    self.output, self.output_sizes = fmp(conv_out, conv_out_sizes, T.cast(factor,'float32'))

    def _forward(self):
        eps = self.eps

        param_size = (1, 1, self.n_output, 1, 1)
        self.gamma = self.declare(param_size)
        self.beta = self.declare(param_size)

        mean = self.inpt.mean(axis=[0, 1, 3, 4], keepdims=False)
        std = self.inpt.std(axis=[0, 1, 3, 4], keepdims=False)

        self._setup_running_metrics(self.n_output)
        self.running_mean.default_update = ifelse(
            self.training,
            (1.0 - self.alpha) * self.running_mean + self.alpha * mean,
            self.running_mean
        )
        self.running_std.default_update = ifelse(
            self.training,
            (1.0 - self.alpha) * self.running_std + self.alpha * std,
            self.running_std
        )

        # This will be optimized away, but ensures the running mean and the running std get updated.
        # Reference: https://gist.github.com/f0k/f1a6bd3c8585c400c190#file-batch_norm-py-L86
        mean += 0 * self.running_mean
        std += 0 * self.running_std

        use_mean = ifelse(self.training, mean, self.running_mean)
        use_std = ifelse(self.training, std, self.running_std)

        use_mean = use_mean.dimshuffle('x', 'x', 0, 'x', 'x')
        use_std = use_std.dimshuffle('x', 'x', 0, 'x', 'x')
        norm_inpt = (self.inpt - use_mean) / (use_std + eps)
        self.output = self.gamma * norm_inpt + self.beta

def AdaMaxAvg2(ws, objective, alpha=.01, beta1=.1, beta2=.001, beta3=0.01, n_accum=1):
    if n_accum == 1:
        return AdaMaxAvg(ws, objective, alpha, beta1, beta2, beta3)
    print 'AdaMax_Avg2', 'alpha:',alpha,'beta1:',beta1,'beta2:',beta2,'beta3:',beta3,'n_accum:',n_accum
    
    gs = G.ndict.T_grad(objective.sum(), ws, disconnected_inputs='raise')

    new = OrderedDict()
    
    from theano.ifelse import ifelse
    it = G.sharedf(0.)
    new[it] = it + 1
    reset = T.eq(T.mod(it,n_accum), 0)
    update = T.eq(T.mod(it,n_accum), n_accum-1)
    
    ws_avg = []
    for j in range(len(ws)):
        w_avg = {}
        for i in ws[j]:
            _w = ws[j][i]
            _g = gs[j][i]
            #_g = T.switch(T.isnan(_g),T.zeros_like(_g),_g) #remove NaN's
            mom1 = G.sharedf(_w.get_value() * 0.)
            _max = G.sharedf(_w.get_value() * 0.)
            w_avg[i] = G.sharedf(_w.get_value())
            g_sum = G.sharedf(_w.get_value() * 0.)
        
            new[g_sum] = ifelse(reset, _g, g_sum + _g)
            new[mom1] = ifelse(update, (1-beta1) * mom1 + beta1 * new[g_sum], mom1)
            new[_max] = ifelse(update, T.maximum((1-beta2)*_max, abs(new[g_sum]) + 1e-8), _max)
            new[_w] = ifelse(update, _w + alpha *  new[mom1] / new[_max], _w)
            new[w_avg[i]] = ifelse(update, beta3 * new[_w] + (1.-beta3) * w_avg[i], w_avg[i])
        ws_avg += [w_avg]   
    return new, ws_avg

 def call(self, vals, mask=None):
     
     block_out = vals[0]
     prev_out = vals[1]
     test_out = self.zi * block_out
     
     return ifelse(self.test, test_out, ifelse(self.zi,block_out,prev_out))

def gate_layer(tparams, X_word, X_char, options, prefix, pretrain_mode, activ='lambda x: x', **kwargs):
    """ 
    compute the forward pass for a gate layer

    Parameters
    ----------
    tparams        : OrderedDict of theano shared variables, {parameter name: value}
    X_word         : theano 3d tensor, word input, dimensions: (num of time steps, batch size, dim of vector)
    X_char         : theano 3d tensor, char input, dimensions: (num of time steps, batch size, dim of vector)
    options        : dictionary, {hyperparameter: value}
    prefix         : string, layer name
    pretrain_mode  : theano shared scalar, 0. = word only, 1. = char only, 2. = word & char
    activ          : string, activation function: 'liner', 'tanh', or 'rectifier'

    Returns
    -------
    X              : theano 3d tensor, final vector, dimensions: (num of time steps, batch size, dim of vector)

    """      
    # compute gating values, Eq.(3)
    G = tensor.nnet.sigmoid(tensor.dot(X_word, tparams[p_name(prefix, 'v')]) + tparams[p_name(prefix, 'b')][0])
    X = ifelse(tensor.le(pretrain_mode, numpy.float32(1.)),  
               ifelse(tensor.eq(pretrain_mode, numpy.float32(0.)), X_word, X_char),
               G[:, :, None] * X_char + (1. - G)[:, :, None] * X_word)   
    return eval(activ)(X)

def more_complex_test():
    notimpl = NotImplementedOp()
    ifelseifelseif = IfElseIfElseIf()

    x1 = T.scalar('x1')
    x2 = T.scalar('x2')
    c1 = T.scalar('c1')
    c2 = T.scalar('c2')
    t1 = ifelse(c1, x1, notimpl(x2))
    t1.name = 't1'
    t2 = t1 * 10
    t2.name = 't2'
    t3 = ifelse(c2, t2, x1 + t1)
    t3.name = 't3'
    t4 = ifelseifelseif(T.eq(x1, x2), x1, T.eq(x1, 5), x2, c2, t3, t3 + 0.5)
    t4.name = 't4'

    f = function([c1, c2, x1, x2], t4, mode=Mode(linker='vm',
                                                 optimizer='fast_run'))
    if theano.config.vm.lazy is False:
        try:
            f(1, 0, numpy.array(10, dtype=x1.dtype), 0)
            assert False
        except NotImplementedOp.E:
            pass
    else:
        print(f(1, 0, numpy.array(10, dtype=x1.dtype), 0))
        assert f(1, 0, numpy.array(10, dtype=x1.dtype), 0) == 20.5
    print('... passed')

    def get_aggregator(self):
        initialized = shared_like(0.)
        numerator_acc = shared_like(self.numerator)
        denominator_acc = shared_like(self.denominator)

        conditional_update_num = ifelse(initialized,
                                        self.numerator + numerator_acc,
                                        self.numerator)
        conditional_update_den = ifelse(initialized,
                                        self.denominator + denominator_acc,
                                        self.denominator)

        initialization_updates = [(numerator_acc,
                                   tensor.zeros_like(numerator_acc)),
                                  (denominator_acc,
                                   tensor.zeros_like(denominator_acc)),
                                  (initialized, 0.)]
        accumulation_updates = [(numerator_acc,
                                 conditional_update_num),
                                (denominator_acc,
                                 conditional_update_den),
                                (initialized, 1.)]
        aggregator = Aggregator(aggregation_scheme=self,
                                initialization_updates=initialization_updates,
                                accumulation_updates=accumulation_updates,
                                readout_variable=(numerator_acc /
                                                  denominator_acc))
        return aggregator

 def build_model(self):
   print '\n... building the model with unroll=%d, backroll=%d' \
     % (self.source.unroll, self.source.backroll)
   x = T.imatrix('x')
   y = T.imatrix('y')
   reset = T.scalar('reset')
   hiddens = [h['init'] for h in self.hiddens.values()]
   outputs_info = [None] * 3 + hiddens
   [losses, probs, errors, hids], updates = \
     theano.scan(self.step, sequences=[x, y], outputs_info=outputs_info)
   loss = losses.sum()
   error = errors.sum() / T.cast((T.neq(y, 255).sum()), floatX)
   hidden_updates_train = []
   hidden_updates_test = []
   for h in self.hiddens.values():
     h_train = ifelse(T.eq(reset, 0), \
       hids[-1-self.source.backroll, :], T.ones_like(h['init']))
     h_test = ifelse(T.eq(reset, 0), \
       hids[-1, :], T.ones_like(h['init']))
     hidden_updates_train.append((h['init'], h_train))
     hidden_updates_test.append((h['init'], h_test))
   updates = self.source.get_updates(loss, self.sgd_params)
   updates += hidden_updates_train
   rets = [loss, probs[-1, :], error]
   mode = theano.Mode(linker='cvm')
   train_model = theano.function([x, y, reset, self.lr], rets, \
     updates=updates, mode=mode)
   test_model = theano.function([x, y, reset], rets, \
     updates=hidden_updates_test, mode=mode)
   return train_model, test_model

def norm_col(w, h):
    """normalize the column vector w (Theano function).
    Apply the invert normalization on h such that w.h does not change

    Parameters
    ----------
    w: Theano vector
        vector to be normalised
    h: Ttheano vector
        vector to be normalised by the invert normalistation

    Returns
    -------
    w : Theano vector with the same shape as w
        normalised vector (w/norm)
    h : Theano vector with the same shape as h
        h*norm
    """
    norm = w.norm(2, 0)
    eps = 1e-12
    size_norm = (T.ones_like(w)).norm(2, 0)
    w = ifelse(T.gt(norm, eps),
               w/norm,
               (w+eps)/(eps*size_norm).astype(theano.config.floatX))
    h = ifelse(T.gt(norm, eps),
               h*norm,
               (h*eps*size_norm).astype(theano.config.floatX))
    return w, h

    def get_aggregator(self):
        initialized = shared_like(0.)
        numerator_acc = shared_like(self.numerator)
        denominator_acc = shared_like(self.denominator)

        # Dummy default expression to use as the previously-aggregated
        # value, that has the same shape as the new result
        numerator_zeros = tensor.as_tensor(self.numerator).zeros_like()
        denominator_zeros = tensor.as_tensor(self.denominator).zeros_like()

        conditional_update_num = self.numerator + ifelse(initialized,
                                                         numerator_acc,
                                                         numerator_zeros)
        conditional_update_den = self.denominator + ifelse(initialized,
                                                           denominator_acc,
                                                           denominator_zeros)

        initialization_updates = [(numerator_acc,
                                   tensor.zeros_like(numerator_acc)),
                                  (denominator_acc,
                                   tensor.zeros_like(denominator_acc)),
                                  (initialized, 0.)]
        accumulation_updates = [(numerator_acc,
                                 conditional_update_num),
                                (denominator_acc,
                                 conditional_update_den),
                                (initialized, 1.)]
        aggregator = Aggregator(aggregation_scheme=self,
                                initialization_updates=initialization_updates,
                                accumulation_updates=accumulation_updates,
                                readout_variable=(numerator_acc /
                                                  denominator_acc))
        return aggregator

    def test_merge_ifs_true_false(self):
        raise SkipTest("Optimization temporarily disabled")
        x1 = tensor.scalar('x1')
        x2 = tensor.scalar('x2')
        y1 = tensor.scalar('y1')
        y2 = tensor.scalar('y2')
        w1 = tensor.scalar('w1')
        w2 = tensor.scalar('w2')
        c = tensor.iscalar('c')

        out = ifelse(c,
            ifelse(c, x1, x2) + ifelse(c, y1, y2) + w1,
            ifelse(c, x1, x2) + ifelse(c, y1, y2) + w2)
        f = theano.function([x1, x2, y1, y2, w1, w2, c], out,
                            allow_input_downcast=True)
        assert len([x for x in f.maker.env.toposort()
                if isinstance(x.op, IfElse)]) == 1

        rng = numpy.random.RandomState(utt.fetch_seed())
        vx1 = rng.uniform()
        vx2 = rng.uniform()
        vy1 = rng.uniform()
        vy2 = rng.uniform()
        vw1 = rng.uniform()
        vw2 = rng.uniform()
        assert numpy.allclose(f(vx1, vx2, vy1, vy2, vw1, vw2, 1),
                              vx1 + vy1 + vw1)
        assert numpy.allclose(f(vx1, vx2, vy1, vy2, vw1, vw2, 0),
                              vx2 + vy2 + vw2)

    def _recursive_step(self, i, regs, tokens, seqs, back_routes, back_lens):
        seq = seqs[i]
        # Encoding
        left, right, target = seq[0], seq[1], seq[2]

        left_rep = ifelse(T.lt(left, 0), tokens[-left], regs[left])
        right_rep = ifelse(T.lt(right, 0), tokens[-right], regs[right])

        rep = self._encode_computation(left_rep, right_rep)

        if self.deep:
            inter_rep = rep
            rep = self._deep_encode(inter_rep)
        else:
            inter_rep = T.constant(0)


        new_regs = T.set_subtensor(regs[target], rep)

        back_len = back_lens[i]

        back_reps, lefts, rights = self._unfold(back_routes[i], new_regs, back_len)
        gf_W_d1, gf_W_d2, gf_B_d1, gf_B_d2, distance, rep_gradient = self._unfold_gradients(back_reps, lefts, rights, back_routes[i],
                                                                    tokens, back_len)

        return ([rep, inter_rep, left_rep, right_rep, new_regs, rep_gradient, distance],
                self.decode_optimizer.setup([self.W_d1, self.W_d2, self.B_d1, self.B_d2],
                                    [gf_W_d1, gf_W_d2, gf_B_d1, gf_B_d2], method=self.optimization, beta=self.beta))

 def decay(self):
     updates = []
     new_batch = ifelse(T.gt(self.batch, self.decay_batch), sharedX(0), self.batch+1)
     new_lr = ifelse(T.gt(self.batch, self.decay_batch), self.lr*self.lr_decay_factor, self.lr)
     updates.append((self.batch, new_batch))
     updates.append((self.lr, new_lr))
     return updates