def param_init_gru(options, params, prefix='gru', nin=None, dim=None):
"""
Gated Recurrent Unit (GRU)
The following equations defne GRU
u = sig(x_t Wu + h_t-1 Uu + bu)
r = sig(x_t Wr + h_t-1 Ur + br)
h = tanh(x_t Wx + (s_t-1 . r) Ux + bx)
s_t = (1 - u) . h + u . s_t-1
Below some of the parameters are initlaized together and later sliced
W = [Wu Wr], i.e. the (horizontal) concatination of Wu and Wr
b = [bu br]
U = [Uu Ur]
"""
if nin == None:
nin = options['dim_word']
if dim == None:
dim = options['dim_proj']
W = numpy.concatenate(
[norm_weight(nin, dim), norm_weight(nin, dim)], axis=1)
params[_p(prefix, 'W')] = W
params[_p(prefix, 'b')] = numpy.zeros((2 * dim, )).astype('float32')
U = numpy.concatenate([ortho_weight(dim), ortho_weight(dim)], axis=1)
params[_p(prefix, 'U')] = U
Wx = norm_weight(nin, dim)
params[_p(prefix, 'Wx')] = Wx
Ux = ortho_weight(dim)
params[_p(prefix, 'Ux')] = Ux
params[_p(prefix, 'bx')] = numpy.zeros((dim, )).astype('float32')
return params
def param_init_decoder(options, params, prefix='decoder_lstm'):
n_x = options['n_x']
n_h = options['n_h']
W = np.concatenate([
uniform_weight(n_x, n_h),
uniform_weight(n_x, n_h),
uniform_weight(n_x, n_h),
uniform_weight(n_x, n_h)
],
axis=1)
params[_p(prefix, 'W')] = W
U = np.concatenate([
ortho_weight(n_h),
ortho_weight(n_h),
ortho_weight(n_h),
ortho_weight(n_h)
],
axis=1)
params[_p(prefix, 'U')] = U
params[_p(prefix, 'b')] = zero_bias(4 * n_h)
params[_p(prefix, 'b')][n_h:2 * n_h] = 3 * np.ones(
(n_h, )).astype(theano.config.floatX)
return params
def param_init_gru(options, params, prefix='gru', nin=None, dim=None):
if nin is None:
nin = options['dim_proj']
if dim is None:
dim = options['dim_proj']
# embedding to gates transformation weights, biases
W = np.concatenate([norm_weight(nin, dim),
norm_weight(nin, dim)], axis=1)
params[_p(prefix, 'W')] = W
params[_p(prefix, 'b')] = np.zeros((2 * dim,)).astype('float32')
# recurrent transformation weights for gates
U = np.concatenate([ortho_weight(dim),
ortho_weight(dim)], axis=1)
params[_p(prefix, 'U')] = U
# embedding to hidden state proposal weights, biases
Wx = norm_weight(nin, dim)
params[_p(prefix, 'Wx')] = Wx
params[_p(prefix, 'bx')] = np.zeros((dim,)).astype('float32')
# recurrent transformation weights for hidden state proposal
Ux = ortho_weight(dim)
params[_p(prefix, 'Ux')] = Ux
return params
def param_init_lstm(options, params, prefix='lstm', nin=None, dim=None):
"""
Init the LSTM parameters
"""
assert (not nin is None and not dim is None)
# input to hidden weights
W = numpy.concatenate([
norm_weight(nin, dim),
norm_weight(nin, dim),
norm_weight(nin, dim),
norm_weight(nin, dim)
],
axis=1)
params[_p(prefix, 'W')] = W
# hidden to hidden (recurrent) weights
U = numpy.concatenate([
ortho_weight(dim),
ortho_weight(dim),
ortho_weight(dim),
ortho_weight(dim)
],
axis=1)
params[_p(prefix, 'U')] = U
# biases
b = numpy.zeros((4 * dim, ))
params[_p(prefix, 'b')] = b.astype(theano.config.floatX)
return params
def param_init_decoder(options, params, prefix='decoder_gru'):
n_x = options['n_x']
n_h = options['n_h']
W = np.concatenate([uniform_weight(n_x,n_h),
uniform_weight(n_x,n_h)], axis=1)
params[_p(prefix,'W')] = W
U = np.concatenate([ortho_weight(n_h),
ortho_weight(n_h)], axis=1)
params[_p(prefix,'U')] = U
params[_p(prefix,'b')] = zero_bias(2*n_h)
Wx = uniform_weight(n_x, n_h)
params[_p(prefix,'Wx')] = Wx
Ux = ortho_weight(n_h)
params[_p(prefix,'Ux')] = Ux
params[_p(prefix,'bx')] = zero_bias(n_h)
params[_p(prefix,'b0')] = zero_bias(n_h)
return params
def param_init_lstm_concat(self, options, params, nin, dim, dimctx,
prefix='lstm_concat'):
# input to LSTM
W = np.concatenate([norm_weight(nin,dim),
norm_weight(nin,dim),
norm_weight(nin,dim),
norm_weight(nin,dim)], axis=1)
params[_p(prefix, 'W')] = W
# LSTM to LSTM
U = np.concatenate([ortho_weight(dim),
ortho_weight(dim),
ortho_weight(dim),
ortho_weight(dim)], axis=1)
params[_p(prefix, 'U')] = U
# bias to LSTM
params[_p(prefix, 'b')] = np.zeros((4 * dim,)).astype('float32')
# context to LSTM
Wc = norm_weight(dimctx, dim*4)
params[_p(prefix, 'Wc')] = Wc
if options['selector']:
# attention: selector
W_sel = norm_weight(dim, 1)
params[_p(prefix, 'W_sel')] = W_sel
b_sel = np.float32(0.)
params[_p(prefix, 'b_sel')] = b_sel
return params
def param_init(options, params, nin, dim, dimctx, prefix='lstm_cond'):
# input to LSTM
W = np.concatenate([
norm_weight(nin, dim),
norm_weight(nin, dim),
norm_weight(nin, dim),
norm_weight(nin, dim)
],
axis=1)
params[_p(prefix, 'W')] = W
# ctx to LSTM
V = np.concatenate([
norm_weight(dimctx, dim),
norm_weight(dimctx, dim),
norm_weight(dimctx, dim),
norm_weight(dimctx, dim)
],
axis=1)
params[_p(prefix, 'V')] = V
# LSTM to LSTM
U = np.concatenate([
ortho_weight(dim),
ortho_weight(dim),
ortho_weight(dim),
ortho_weight(dim)
],
axis=1)
params[_p(prefix, 'U')] = U
params[_p(prefix, 'b')] = np.zeros((4 * dim, )).astype('float32')
return params
def param_init_encoder(options, params, prefix='lstm_encoder'):
n_x = options['n_x']
n_h = options['n_h']
W = np.concatenate([uniform_weight(n_x,n_h),
uniform_weight(n_x,n_h),
uniform_weight(n_x,n_h),
uniform_weight(n_x,n_h)], axis=1)
params[_p(prefix, 'W')] = W
U = np.concatenate([ortho_weight(n_h),
ortho_weight(n_h),
ortho_weight(n_h),
ortho_weight(n_h)], axis=1)
params[_p(prefix, 'U')] = U
params[_p(prefix,'b')] = zero_bias(4*n_h)
# It is observed that setting a high initial forget gate bias for LSTMs can
# give slighly better results (Le et al., 2015). Hence, the initial forget
# gate bias is set to 3.
params[_p(prefix, 'b')][n_h:2*n_h] = 3*np.ones((n_h,)).astype(theano.config.floatX)
return params
def param_init_encoder(options, params, prefix='lstm_encoder'):
n_x = options['n_x']
n_h = options['n_h']
W = np.concatenate([
uniform_weight(n_x, n_h),
uniform_weight(n_x, n_h),
uniform_weight(n_x, n_h),
uniform_weight(n_x, n_h)
],
axis=1)
params[_p(prefix, 'W')] = W
U = np.concatenate([
ortho_weight(n_h),
ortho_weight(n_h),
ortho_weight(n_h),
ortho_weight(n_h)
],
axis=1)
params[_p(prefix, 'U')] = U
params[_p(prefix, 'b')] = zero_bias(4 * n_h)
# It is observed that setting a high initial forget gate bias for LSTMs can
# give slighly better results (Le et al., 2015). Hence, the initial forget
# gate bias is set to 3.
params[_p(prefix, 'b')][n_h:2 * n_h] = 3 * np.ones(
(n_h, )).astype(theano.config.floatX)
return params
def param_init_decoder(options, params, prefix='decoder_gru'):
n_x = options['n_x']
n_h = options['n_h']
W = np.concatenate([uniform_weight(n_x, n_h),
uniform_weight(n_x, n_h)],
axis=1)
params[_p(prefix, 'W')] = W
U = np.concatenate([ortho_weight(n_h), ortho_weight(n_h)], axis=1)
params[_p(prefix, 'U')] = U
params[_p(prefix, 'b')] = zero_bias(2 * n_h)
Wx = uniform_weight(n_x, n_h)
params[_p(prefix, 'Wx')] = Wx
Ux = ortho_weight(n_h)
params[_p(prefix, 'Ux')] = Ux
params[_p(prefix, 'bx')] = zero_bias(n_h)
params[_p(prefix, 'b0')] = zero_bias(n_h)
return params
def param_init_lstm(options, params, prefix='lstm', nin=None, dim=None):
if nin is None:
nin = options['dim_proj']
if dim is None:
dim = options['dim_proj']
W = numpy.concatenate([
norm_weight(nin, dim),
norm_weight(nin, dim),
norm_weight(nin, dim),
norm_weight(nin, dim)
],
axis=1)
params[prfx(prefix, 'W')] = W
U = numpy.concatenate([
ortho_weight(dim),
ortho_weight(dim),
ortho_weight(dim),
ortho_weight(dim)
],
axis=1)
params[prfx(prefix, 'U')] = U
params[prfx(prefix, 'b')] = numpy.zeros((4 * dim, )).astype('float32')
return params
def param_init_lstm_cond(self,
options,
params,
prefix='lstm_cond',
nin=None,
dim=None,
dimctx=None): #nin=512 dim=512 dimctx=2048
if nin == None:
nin = options['word_dim']
if dim == None:
dim = options['lstm_dim']
if dimctx == None:
dimctx = options['ctx_dim']
# input to LSTM
W = np.concatenate([
norm_weight(nin, dim),
norm_weight(nin, dim),
norm_weight(nin, dim),
norm_weight(nin, dim)
],
axis=1)
params[_p(prefix, 'W')] = W # bo_lstm_W:(512,2048)
# LSTM to LSTM
U = np.concatenate([
ortho_weight(dim),
ortho_weight(dim),
ortho_weight(dim),
ortho_weight(dim)
],
axis=1)
params[_p(prefix, 'U')] = U # bo_lstm_U:(512,2048)
# bias to LSTM
params[_p(prefix, 'b')] = np.zeros(
(4 * dim, )).astype('float32') # bo_lstm_b:(2048,)
# attention: context -> hidden
# Wc_att = norm_weight(dimctx, ortho=False)
Wc_att = norm_weight(dim, ortho=False)
params[_p(prefix, 'Wc_att')] = Wc_att # bo_lstm_Wc_att:(2048,2048)
# attention: LSTM -> hidden
# Wd_att = norm_weight(dim, dimctx)
Wd_att = norm_weight(dim, dim)
params[_p(prefix, 'Wd_att')] = Wd_att # bo_lstm_Wd_att:(512,2048)
# attention: hidden bias
# b_att = np.zeros((dimctx,)).astype('float32')
b_att = np.zeros((dim, )).astype('float32')
params[_p(prefix, 'b_att')] = b_att # bo_lstm_b_att:(2048,)
# attention:
# U_att = norm_weight(dimctx, 1)
U_att = norm_weight(dim, 28)
params[_p(prefix, 'U_att')] = U_att # bo_lstm_U_att:(2048,1)
c_att = np.zeros((1, )).astype('float32')
params[_p(prefix, 'c_att')] = c_att # bo_lstm_c_att:(1,)
if options['selector']:
# attention: selector
W_sel = norm_weight(dim, 1)
params[_p(prefix, 'W_sel')] = W_sel # bo_lstm_W_sel:(512,1)
b_sel = np.float32(0.)
params[_p(prefix, 'b_sel')] = b_sel # bo_lstm_b_sel: 0
return params
def param_init_lstm_peep(options, params, prefix='lstm', nin=None, dim=None):
"""
Code based on http://deeplearning.net/tutorial/code/lstm.py and Jamie's GRU code
Long Short Term Memory Unit (LSTM)
LSTM is defined by the follow equations,
W = [Wi Wf Wc Wo] # input weights
b = [bi bf bc bo] # biases
U = [Ui Uf Uc Uo] # recurrent weights
Pi Pf Po c_t-1 # peep hole params and the previous cell, c_t-1
i_t = sig(Wi x_t + Ui h_t-1 + Pi c_t-1 + bi)
f_t = sig(Wf x_t + Uf h_t-1 + Pf c_t-1 + bf)
c_t = f_t c_t-1 + i_t tanh(Wc x_t + Uc h_t-1 + bc)
o_t = sig(Wo x_t + Uo h_t-1 + Po c_t-1 + bo)
h_t = o_t tanh(c_t)
"""
if nin == None:
nin = options['dim_word']
if dim == None:
dim = options['dim_proj']
# input weight matrix is 4 times for the input gate, forget gate, output gate, and cell input
W = numpy.concatenate([
norm_weight(nin, dim),
norm_weight(nin, dim),
norm_weight(nin, dim),
norm_weight(nin, dim)
],
axis=1)
params[_p(prefix, 'W')] = W
params[_p(prefix, 'b')] = numpy.zeros((4 * dim, )).astype('float32')
# The recurrent weight matrix
U = numpy.concatenate(
[
ortho_weight(dim),
ortho_weight(dim), # remember this is ortho_weight(dim, dim)
ortho_weight(dim),
ortho_weight(dim)
],
axis=1)
params[_p(prefix, 'U')] = U
# Peep holes weight vectors, all initialized to zero
# Peep hole weights are diagonal as in Grave's paper
params[_p(prefix, 'Pi')] = numpy.zeros((dim, )).astype('float32')
params[_p(prefix, 'Pf')] = numpy.zeros((dim, )).astype('float32')
params[_p(prefix, 'Po')] = numpy.zeros((dim, )).astype('float32')
# inital h_0, and cell get made in lstm_layer or passed in
# initialize forget gates to one?
return params
def param_init_gru(options, param, prefix='gru', nin=None, dim=None):
param[prefix + '_W'] = numpy.concatenate(
[norm_weight(nin, dim), norm_weight(nin, dim)], axis=1)
param[prefix + '_U'] = numpy.concatenate(
[ortho_weight(dim), ortho_weight(dim)], axis=1)
param[prefix + '_b'] = zero_vector(2 * dim)
param[prefix + '_Wx'] = norm_weight(nin, dim)
param[prefix + '_Ux'] = ortho_weight(dim)
param[prefix + '_bx'] = zero_vector(dim)
return param
def __init__(self, n_input, n_output):
"""
:type nc: int
:param nc: dimension of input vector
:type nh: int
:param nh: number of hidden units in this layer
:type no: int
:param no: dimension of output vector
"""
# Parameter of this lstm layer
self._name = "attention_blstm_fusion"
self.n_input = n_input
self.n_output = n_output
# Wh = [ Wi, Wc, Wf, Wo]
Wh = np.concatenate([np.random.randn(n_input, n_output).astype(theano.config.floatX),
np.random.randn(n_input, n_output).astype(theano.config.floatX),
np.random.randn(n_input, n_output).astype(theano.config.floatX),
np.random.randn(n_input, n_output).astype(theano.config.floatX)]
, axis=1)
self.Wh = theano.shared(value=Wh, name='Wh', borrow=True)
# U = [Ui, Uc, Uf, Uo]
Uh = np.concatenate([ortho_weight(n_output, n_output), ortho_weight(n_output, n_output),
ortho_weight(n_output, n_output), ortho_weight(n_output, n_output)]
, axis=1)
self.Uh = theano.shared(value=Uh, name='Uh', borrow=True)
# bh = [bi, bc, bf, bo]
bh = np.zeros((n_output * 4,)).astype(theano.config.floatX)
self.bh = theano.shared(value=bh, name='bh', borrow=True)
Wh_reverse = np.concatenate([np.random.randn(n_input, n_output).astype(theano.config.floatX),
np.random.randn(n_input, n_output).astype(theano.config.floatX),
np.random.randn(n_input, n_output).astype(theano.config.floatX),
np.random.randn(n_input, n_output).astype(theano.config.floatX)]
, axis=1)
self.Wh_reverse = theano.shared(value=Wh_reverse, name='Wh_reverse', borrow=True)
# U = [Ui, Uc, Uf, Uo]
Uh_reverse = np.concatenate([ortho_weight(n_output, n_output), ortho_weight(n_output, n_output),
ortho_weight(n_output, n_output), ortho_weight(n_output, n_output)]
, axis=1)
self.Uh_reverse = theano.shared(value=Uh_reverse, name='Uh_reverse', borrow=True)
# bh = [bi, bc, bf, bo]
bh_reverse = np.zeros((n_output * 4,)).astype(theano.config.floatX)
self.bh_reverse = theano.shared(value=bh_reverse, name='bh_reverse', borrow=True)
self._output = np.zeros(2, )
self.params = [self.Wh, self.Uh, self.bh, self.Wh_reverse, self.Uh_reverse, self.bh_reverse]
Wa = 0.01*np.random.rand(n_input,n_input).astype(theano.config.floatX)
Ua = 0.01*np.random.rand(n_output,n_input).astype(theano.config.floatX)
Va = 0.01*np.random.rand(n_input,1).astype(theano.config.floatX)
self.Wa = theano.shared(value=Wa, name='Wa', borrow=True)
self.Ua = theano.shared(value=Ua, name='Ua', borrow=True)
#self.Va = theano.shared(value=Va, name='Va', borrow=True)
self.params.extend([self.Wa, self.Ua])#, self.Va])
def __init__(self, n_input, n_output):
"""
:type nc: int
:param nc: dimension of input vector
:type nh: int
:param nh: number of hidden units in this layer
:type no: int
:param no: dimension of output vector
"""
# Parameter of this lstm layer
self._name = "LSTM_MASK"
self.n_input = n_input
self.n_output = n_output
# Wh = [ Wi, Wc, Wf, Wo]
Wh = np.concatenate([ortho_weight(n_input, n_output), ortho_weight(n_input, n_output),
ortho_weight(n_input, n_output), ortho_weight(n_input, n_output)]
, axis=1)
self.Wh = theano.shared(value=Wh, name='Wh', borrow=True)
# U = [Ui, Uc, Uf, Uo]
Uh = np.concatenate([ortho_weight(n_output, n_output), ortho_weight(n_output, n_output),
ortho_weight(n_output, n_output), ortho_weight(n_output, n_output)]
, axis=1)
self.Uh = theano.shared(value=Uh, name='Uh', borrow=True)
# bh = [bi, bc, bf, bo]
bh = np.zeros((n_output * 4,)).astype(theano.config.floatX)
self.bh = theano.shared(value=bh, name='bh', borrow=True)
self.params = [self.Wh, self.Uh, self.bh]
def param_init_lstm(options, params, prefix='lstm'):
"""
Init the LSTM parameter:
:see: init_params
"""
W = numpy.concatenate([
ortho_weight(options['dim_proj']),
ortho_weight(options['dim_proj']),
ortho_weight(options['dim_proj']),
ortho_weight(options['dim_proj'])
],
axis=1)
params[_p(prefix, 'W')] = W
U = numpy.concatenate([
ortho_weight(options['dim_proj']),
ortho_weight(options['dim_proj']),
ortho_weight(options['dim_proj']),
ortho_weight(options['dim_proj'])
],
axis=1)
params[_p(prefix, 'U')] = U
b = numpy.zeros((4 * options['dim_proj'], ))
params[_p(prefix, 'b')] = b.astype(config.floatX)
return params
def init_params(self):
Wi_values = utils.ortho_weight(self.dim)
self.Wi = theano.shared(Wi_values, name="LSTM_Wi")
Wf_values = utils.ortho_weight(self.dim)
self.Wf = theano.shared(Wf_values, name="LSTM_Wf")
Wc_values = utils.ortho_weight(self.dim)
self.Wc = theano.shared(Wc_values, name="LSTM_Wc")
Wo_values = utils.ortho_weight(self.dim)
self.Wo = theano.shared(Wo_values, name="LSTM_Wo")
Ui_values = utils.ortho_weight(self.dim)
self.Ui = theano.shared(Ui_values, name="LSTM_Ui")
Uf_values = utils.ortho_weight(self.dim)
self.Uf = theano.shared(Uf_values, name="LSTM_Uf")
Uc_values = utils.ortho_weight(self.dim)
self.Uc = theano.shared(Uc_values, name="LSTM_Uc")
Uo_values = utils.ortho_weight(self.dim)
self.Uo = theano.shared(Uo_values, name="LSTM_Uo")
b_values = np.zeros((self.dim, ), dtype=theano.config.floatX)
self.bi = theano.shared(b_values, name="LSTM_bi")
self.bf = theano.shared(b_values, name="LSTM_bf")
self.bc = theano.shared(b_values, name="LSTM_bc")
self.bo = theano.shared(b_values, name="LSTM_bo")
self.params = [
self.Wi, self.Ui, self.bi, self.Wf, self.Uf, self.bf, self.Wc,
self.Uc, self.bc, self.Wo, self.Uo, self.bo
]
def param_init_lstm_cond(self, options, params, nin, dim, dimctx,
prefix='lstm_cond'):
# input to LSTM
W = np.concatenate([norm_weight(nin,dim),
norm_weight(nin,dim),
norm_weight(nin,dim),
norm_weight(nin,dim)], axis=1)
params[_p(prefix, 'W')] = W
# LSTM to LSTM
U = np.concatenate([ortho_weight(dim),
ortho_weight(dim),
ortho_weight(dim),
ortho_weight(dim)], axis=1)
params[_p(prefix, 'U')] = U
# bias to LSTM
params[_p(prefix, 'b')] = np.zeros((4 * dim,)).astype('float32')
# context to LSTM
Wc = norm_weight(dimctx,dim*4)
params[_p(prefix, 'Wc')] = Wc
# attention: context -> hidden
Wc_att = norm_weight(dimctx, ortho=False)
params[_p(prefix, 'Wc_att')] = Wc_att
# attention: LSTM -> hidden
Wd_att = norm_weight(dim,dimctx)
params[_p(prefix, 'Wd_att')] = Wd_att
# attention: hidden bias
b_att = np.zeros((dimctx,)).astype('float32')
params[_p(prefix, 'b_att')] = b_att
# attention:
U_att = norm_weight(dimctx, 1)
params[_p(prefix, 'U_att')] = U_att
c_att = np.zeros((1,)).astype('float32')
params[_p(prefix, 'c_tt')] = c_att
if options['selector']:
# attention: selector
W_sel = norm_weight(dim, 1)
params[_p(prefix, 'W_sel')] = W_sel
b_sel = np.float32(0.)
params[_p(prefix, 'b_sel')] = b_sel
return params
def _init_gru(in_dim, hid_dim, prefix_):
param[prefix_ + '_W'] = numpy.concatenate(
[uniform_weight(in_dim, hid_dim),
uniform_weight(in_dim, hid_dim)],
axis=1)
param[prefix_ + '_Wx'] = uniform_weight(in_dim, hid_dim)
param[prefix_ + '_U'] = numpy.concatenate(
[ortho_weight(hid_dim),
ortho_weight(hid_dim)], axis=1)
param[prefix_ + '_b'] = zero_vector(2 * hid_dim)
param[prefix_ + '_Ux'] = ortho_weight(hid_dim)
param[prefix_ + '_bx'] = zero_vector(hid_dim)
def LSTM(input_x, rnn_size,
batch_size): #input(batch_size, steps, embedding_size)
num_steps = int(input_x.get_shape()[1])
embedding_size = int(input_x.get_shape()[2])
#define parameter
W = tf.get_variable("W",
initializer=tf.concat(1, [
uniform_weight(embedding_size, rnn_size),
uniform_weight(embedding_size, rnn_size)
]))
U = tf.get_variable(
"U",
initializer=tf.concat(1,
[ortho_weight(rnn_size),
ortho_weight(rnn_size)]))
b = tf.get_variable("b", initializer=tf.zeros([2 * rnn_size]))
Wx = tf.get_variable("Wx",
initializer=uniform_weight(embedding_size, rnn_size))
Ux = tf.get_variable("Ux", initializer=ortho_weight(rnn_size))
bx = tf.get_variable("bx", initializer=tf.zeros([rnn_size]))
h_ = tf.zeros([batch_size, rnn_size])
one = tf.fill([batch_size, rnn_size], 1.)
state_below = tf.transpose(tf.batch_matmul(
input_x,
tf.tile(tf.reshape(W, [1, embedding_size, 2 * rnn_size]),
[batch_size, 1, 1])) + b,
perm=[1, 0, 2])
state_belowx = tf.transpose(tf.batch_matmul(
input_x,
tf.tile(tf.reshape(Wx, [1, embedding_size, rnn_size]),
[batch_size, 1, 1])) + bx,
perm=[1, 0, 2]) #(steps, batch_size, rnn_size)
output = [] #(steps, batch_size, rnn_size)
with tf.variable_scope("GRU"):
for time_step in range(num_steps):
preact = tf.matmul(h_, U)
preact = tf.add(preact, state_below[time_step])
r = tf.nn.sigmoid(_slice(preact, 0, rnn_size))
u = tf.nn.sigmoid(_slice(preact, 1, rnn_size))
preactx = tf.matmul(h_, Ux)
preactx = tf.mul(preactx, r)
preactx = tf.add(preactx, state_belowx[time_step])
h = tf.tanh(preactx)
h_ = tf.add(tf.mul(u, h_), tf.mul(tf.sub(one, u), h))
output.append(h_)
output = tf.transpose(output, perm=[1, 0, 2])
return output #(batch_size, steps, rnn_size)
def param_init_lstm(self, params, nin, dim, prefix='lstm'):
assert prefix is not None
# Stack the weight matricies for faster dot prods
W = np.concatenate([norm_weight(nin, dim),
norm_weight(nin, dim),
norm_weight(nin, dim),
norm_weight(nin, dim)], axis=1)
params[_p(prefix, 'W')] = W # to_lstm_W:(512,2048)
U = np.concatenate([ortho_weight(dim),
ortho_weight(dim),
ortho_weight(dim),
ortho_weight(dim)], axis=1)
params[_p(prefix, 'U')] = U # to_lstm_U:(512,2048)
params[_p(prefix, 'b')] = np.zeros((4*dim,)).astype('float32') # to_lstm_b:(2048,)
return params
def param_init(params, nin, dim, prefix='lstm'):
assert prefix is not None
# Stack the weight matricies for faster dot prods
W = np.concatenate([norm_weight(nin,dim),
norm_weight(nin,dim),
norm_weight(nin,dim),
norm_weight(nin,dim)], axis=1)
params[_p(prefix, 'W')] = W
U = np.concatenate([ortho_weight(dim),
ortho_weight(dim),
ortho_weight(dim),
ortho_weight(dim)], axis=1)
params[_p(prefix, 'U')] = U
params[_p(prefix, 'b')] = np.zeros((4 * dim,)).astype('float32')
return params
def param_init_decoder(options, params, prefix='decoder'):
n_x = options['n_x']
n_h = options['n_h']
n_z = options['n_z']
W = np.concatenate([
uniform_weight(n_x, n_h),
uniform_weight(n_x, n_h),
uniform_weight(n_x, n_h),
uniform_weight(n_x, n_h)
],
axis=1)
params[_p(prefix, 'W')] = W
U = np.concatenate([
ortho_weight(n_h),
ortho_weight(n_h),
ortho_weight(n_h),
ortho_weight(n_h)
],
axis=1)
params[_p(prefix, 'U')] = U
C = np.concatenate([
uniform_weight(n_z, n_h),
uniform_weight(n_z, n_h),
uniform_weight(n_z, n_h),
uniform_weight(n_z, n_h)
],
axis=1)
params[_p(prefix, 'C')] = C
params[_p(prefix, 'b')] = zero_bias(4 * n_h)
params[_p(prefix, 'b')][n_h:2 * n_h] = 3 * np.ones(
(n_h, )).astype(theano.config.floatX)
C0 = uniform_weight(n_z, n_h)
params[_p(prefix, 'C0')] = C0
params[_p(prefix, 'b0')] = zero_bias(n_h)
#params[_p(prefix,'b_y')] = zero_bias(n_x) # 48
return params
def param_init_gru(prefix='gru', nin=None, dim=None):
#Gated Recurrent Unit (GRU)
params = {}
W = [norm_weight(nin, dim), norm_weight(nin, dim)]
params[_p(prefix, 'W')] = W
params[_p(prefix, 'b1')] = np.zeros((dim, ), dtype=np.float32)
params[_p(prefix, 'b2')] = np.zeros((dim, ), dtype=np.float32)
U = [ortho_weight(dim), ortho_weight(dim)]
params[_p(prefix, 'U')] = U
Wx = norm_weight(nin, dim)
params[_p(prefix, 'Wx')] = Wx
Ux = ortho_weight(dim)
params[_p(prefix, 'Ux')] = Ux
params[_p(prefix, 'bx')] = np.zeros((dim, ), dtype=np.float32)
return params[_p(prefix,'W')][0], params[_p(prefix,'W')][1], params[_p(prefix,'U')][0] , \
params[_p(prefix,'U')][1], params[_p(prefix,'b1')], params[_p(prefix,'b2')], \
params[_p(prefix,'Wx')], params[_p(prefix,'Ux')], params[_p(prefix,'bx')]
def param_init_cnn(options, params, prefix='cnn'):
feature_maps = options['feature_maps']
filter_hs = options['filter_hs']
# Fixed image shape
num_chn = len(options['W'])
if options['bidir']:
num_chn = num_chn * 2
if options['combine']:
num_chn = num_chn * 2
image_shape = (options['batch_size'], num_chn, options['maxlen'],
options['dim_proj'])
img_h = image_shape[2]
img_w = image_shape[3]
options['image_shape'] = image_shape
# init filter,bias
filter_shapes = []
pool_sizes = []
filter_w = options['dim_proj']
for filter_h in filter_hs:
filter_shape = (feature_maps, num_chn, filter_h, filter_w)
pool_size = (img_h - filter_h + 1, img_w - filter_w + 1)
#4 different initialization of filters
if options['init'] == 'uniform':
params['cnn_f' + str(filter_h)] = numpy.random.uniform(
low=-0.01, high=0.01, size=filter_shape).astype(config.floatX)
elif options['init'] == 'xavier':
fan_in = numpy.prod(filter_shape[1:])
fan_out = (filter_shape[0] * numpy.prod(filter_shape[2:]) /
numpy.prod(pool_size))
W_bound = numpy.sqrt(6. / (fan_in + fan_out))
params['cnn_f' + str(filter_h)] = numpy.random.uniform(
low=-W_bound, high=W_bound,
size=filter_shape).astype(config.floatX)
elif options['init'] == 'gaussian':
params['cnn_f' + str(filter_h)] = numpy.random.normal(
size=filter_shape).astype(config.floatX)
elif options['init'] == 'ortho':
W_ortho = ortho_weight(numpy.prod(filter_shape[1:]))
W_ortho = numpy.reshape(W_ortho[:filter_shape[0]], filter_shape)
params['cnn_f' + str(filter_h)] = W_ortho
params['cnn_b' + str(filter_h)] = numpy.zeros(
(filter_shape[0], )).astype(config.floatX)
filter_shapes.append(filter_shape)
pool_sizes.append(pool_size)
options['filter_shapes'] = filter_shapes
options['pool_sizes'] = pool_sizes
return params
def param_init_lnlstm(options, params, prefix='lnlstm', nin=None, dim=None):
if nin is None:
nin = options['dim_proj']
if dim is None:
dim = options['dim_proj']
W = numpy.concatenate([
norm_weight(nin, dim),
norm_weight(nin, dim),
norm_weight(nin, dim),
norm_weight(nin, dim)
],
axis=1)
params[prfx(prefix, 'W')] = W
U = numpy.concatenate([
ortho_weight(dim),
ortho_weight(dim),
ortho_weight(dim),
ortho_weight(dim)
],
axis=1)
params[prfx(prefix, 'U')] = U
params[prfx(prefix, 'b')] = numpy.zeros((4 * dim, )).astype('float32')
# lateral parameters
scale_add = 0.0
scale_mul = 1.0
params[prfx(prefix, 'b1')] = scale_add * numpy.ones(
(4 * dim)).astype('float32')
params[prfx(prefix, 'b2')] = scale_add * numpy.ones(
(4 * dim)).astype('float32')
params[prfx(prefix, 'b3')] = scale_add * numpy.ones(
(1 * dim)).astype('float32')
params[prfx(prefix, 's1')] = scale_mul * numpy.ones(
(4 * dim)).astype('float32')
params[prfx(prefix, 's2')] = scale_mul * numpy.ones(
(4 * dim)).astype('float32')
params[prfx(prefix, 's3')] = scale_mul * numpy.ones(
(1 * dim)).astype('float32')
return params
def param_init_gru(options, param, prefix='gru', nin=None, dim=None):
param[prefix + '_W'] = numpy.concatenate(
[
norm_weight(nin, dim), norm_weight(nin, dim)
],
axis=1)
param[prefix + '_U'] = numpy.concatenate(
[
ortho_weight(dim), ortho_weight(dim)
],
axis=1)
param[prefix + '_b'] = zero_vector(2 * dim)
param[prefix + '_Wx'] = norm_weight(nin, dim)
param[prefix + '_Ux'] = ortho_weight(dim)
param[prefix + '_bx'] = zero_vector(dim)
return param
def param_init_lngru(options, params, prefix='lngru', nin=None, dim=None):
"""
Gated Recurrent Unit (GRU) with LN
"""
if nin == None:
nin = options['dim_proj']
if dim == None:
dim = options['dim_proj']
W = numpy.concatenate(
[norm_weight(nin, dim), norm_weight(nin, dim)], axis=1)
params[_p(prefix, 'W')] = W.astype('float32')
params[_p(prefix, 'b')] = numpy.zeros((2 * dim, )).astype('float32')
U = numpy.concatenate([ortho_weight(dim), ortho_weight(dim)], axis=1)
params[_p(prefix, 'U')] = U.astype('float32')
Wx = norm_weight(nin, dim)
params[_p(prefix, 'Wx')] = Wx.astype('float32')
Ux = ortho_weight(dim)
params[_p(prefix, 'Ux')] = Ux.astype('float32')
params[_p(prefix, 'bx')] = numpy.zeros((dim, )).astype('float32')
# LN parameters
scale_add = 0.0
scale_mul = 1.0
params[_p(prefix, 'b1')] = scale_add * numpy.ones(
(2 * dim)).astype('float32')
params[_p(prefix, 'b2')] = scale_add * numpy.ones(
(1 * dim)).astype('float32')
params[_p(prefix, 'b3')] = scale_add * numpy.ones(
(2 * dim)).astype('float32')
params[_p(prefix, 'b4')] = scale_add * numpy.ones(
(1 * dim)).astype('float32')
params[_p(prefix, 's1')] = scale_mul * numpy.ones(
(2 * dim)).astype('float32')
params[_p(prefix, 's2')] = scale_mul * numpy.ones(
(1 * dim)).astype('float32')
params[_p(prefix, 's3')] = scale_mul * numpy.ones(
(2 * dim)).astype('float32')
params[_p(prefix, 's4')] = scale_mul * numpy.ones(
(1 * dim)).astype('float32')
return params
def param_init_gru_cond(options,
param,
prefix='gru_cond',
nin=None,
dim=None,
dimctx=None,
nin_nonlin=None,
dim_nonlin=None):
if nin_nonlin is None:
nin_nonlin = nin
if dim_nonlin is None:
dim_nonlin = dim
param = param_init_gru(options, param, prefix=prefix, nin=nin, dim=dim)
param[prefix + '_U_nl'] = numpy.concatenate(
[ortho_weight(dim_nonlin),
ortho_weight(dim_nonlin)], axis=1)
param[prefix + '_b_nl'] = zero_vector(2 * dim_nonlin)
param[prefix + '_Ux_nl'] = ortho_weight(dim_nonlin)
param[prefix + '_bx_nl'] = zero_vector(dim_nonlin)
# context to LSTM
param[prefix + '_Wc'] = uniform_weight(dimctx, dim * 2)
param[prefix + '_Wcx'] = uniform_weight(dimctx, dim)
# attention: combined -> hidden
param[prefix + '_W_comb_att'] = uniform_weight(dim, dimctx)
# attention: context -> hidden
param[prefix + '_Wc_att'] = uniform_weight(dimctx, dimctx)
# attention: hidden bias
param[prefix + '_b_att'] = zero_vector(dimctx)
# attention:
param[prefix + '_U_att'] = uniform_weight(dimctx, 1)
param[prefix + '_c_att'] = zero_vector(1)
return param
def param_init_gru(options, params, prefix='gru', nin=None, dim=None, hiero=False):
if nin == None:
nin = options['dim_proj']
if dim == None:
dim = options['dim_proj']
if not hiero:
W = numpy.concatenate([norm_weight(nin,dim),
norm_weight(nin,dim)], axis=1)
params[prfx(prefix,'W')] = W
params[prfx(prefix,'b')] = numpy.zeros((2 * dim,)).astype('float32')
U = numpy.concatenate([ortho_weight(dim),
ortho_weight(dim)], axis=1)
params[prfx(prefix,'U')] = U
Wx = norm_weight(nin, dim)
params[prfx(prefix,'Wx')] = Wx
Ux = ortho_weight(dim)
params[prfx(prefix,'Ux')] = Ux
params[prfx(prefix,'bx')] = numpy.zeros((dim,)).astype('float32')
return params
def param_init_gru_rmn(params, prefix='gru_rmn', nin=None, dim=None,
vocab_size=None, memory_dim=None, memory_size=None):
assert dim == memory_dim, 'Should be fixed!'
# first GRU params
W = numpy.concatenate([norm_weight(nin, dim),
norm_weight(nin, dim)], axis=1)
params[_p(prefix, 'W')] = W
params[_p(prefix, 'b')] = numpy.zeros((2 * dim,)).astype('float32')
U = numpy.concatenate([ortho_weight(dim), ortho_weight(dim)], axis=1)
params[_p(prefix, 'U')] = U
params[_p(prefix, 'Wx')] = norm_weight(nin, dim)
params[_p(prefix, 'Ux')] = ortho_weight(dim)
params[_p(prefix, 'bx')] = numpy.zeros((dim,)).astype('float32')
# memory block params
params[_p(prefix, 'M')] = norm_weight(vocab_size, memory_dim)
params[_p(prefix, 'C')] = norm_weight(vocab_size, memory_dim)
params[_p(prefix, 'T')] = norm_weight(memory_size, memory_dim)
# second GRU params
params[_p(prefix, 'Wz')] = norm_weight(dim, memory_dim, ortho=False)
params[_p(prefix, 'Wr')] = norm_weight(dim, memory_dim, ortho=False)
params[_p(prefix, 'W2')] = norm_weight(dim, memory_dim, ortho=False)
params[_p(prefix, 'Uz')] = ortho_weight(dim)
params[_p(prefix, 'Ur')] = ortho_weight(dim)
params[_p(prefix, 'U2')] = ortho_weight(dim)
return params
def param_init_gru(options, params, prefix='gru', nin=None, dim=None):
"""
Gated Recurrent Unit (GRU)
"""
if nin == None:
nin = options['dim_proj']
if dim == None:
dim = options['dim_proj']
W = numpy.concatenate(
[norm_weight(nin, dim), norm_weight(nin, dim)], axis=1)
params[_p(prefix, 'W')] = W
params[_p(prefix, 'b')] = numpy.zeros((2 * dim, )).astype('float32')
U = numpy.concatenate([ortho_weight(dim), ortho_weight(dim)], axis=1)
params[_p(prefix, 'U')] = U
Wx = norm_weight(nin, dim)
params[_p(prefix, 'Wx')] = Wx
Ux = ortho_weight(dim)
params[_p(prefix, 'Ux')] = Ux
params[_p(prefix, 'bx')] = numpy.zeros((dim, )).astype('float32')
return params
def param_init_gru(options, params, prefix='gru', nin=None, dim=None):
"""
Gated Recurrent Unit (GRU)
"""
if nin == None:
nin = options['dim_proj']
if dim == None:
dim = options['dim_proj']
W = numpy.concatenate([norm_weight(nin,dim),
norm_weight(nin,dim)], axis=1)
params[_p(prefix,'W')] = W
params[_p(prefix,'b')] = numpy.zeros((2 * dim,)).astype('float32')
U = numpy.concatenate([ortho_weight(dim),
ortho_weight(dim)], axis=1)
params[_p(prefix,'U')] = U
Wx = norm_weight(nin, dim)
params[_p(prefix,'Wx')] = Wx
Ux = ortho_weight(dim)
params[_p(prefix,'Ux')] = Ux
params[_p(prefix,'bx')] = numpy.zeros((dim,)).astype('float32')
return params
def param_init_decoder(options, params, prefix='decoder_vanilla'):
n_x = options['n_x']
n_h = options['n_h']
W = uniform_weight(n_x, n_h)
params[_p(prefix, 'W')] = W
U = ortho_weight(n_h)
params[_p(prefix, 'U')] = U
params[_p(prefix, 'b')] = zero_bias(n_h)
return params
def param_init_gru_cond(options, params, prefix='gru_cond',
nin=None, dim=None, dimctx=None,
nin_nonlin=None, dim_nonlin=None):
if nin is None:
nin = options['dim']
if dim is None:
dim = options['dim']
if dimctx is None:
dimctx = options['dim']
if nin_nonlin is None:
nin_nonlin = nin
if dim_nonlin is None:
dim_nonlin = dim
W = np.concatenate([norm_weight(nin, dim),
norm_weight(nin, dim)], axis=1)
params[_p(prefix, 'W')] = W
params[_p(prefix, 'b')] = np.zeros((2 * dim,)).astype('float32')
U = np.concatenate([ortho_weight(dim_nonlin),
ortho_weight(dim_nonlin)], axis=1)
params[_p(prefix, 'U')] = U
Wx = norm_weight(nin_nonlin, dim_nonlin)
params[_p(prefix, 'Wx')] = Wx
Ux = ortho_weight(dim_nonlin)
params[_p(prefix, 'Ux')] = Ux
params[_p(prefix, 'bx')] = np.zeros((dim_nonlin,)).astype('float32')
U_nl = np.concatenate([ortho_weight(dim_nonlin),
ortho_weight(dim_nonlin)], axis=1)
params[_p(prefix, 'U_nl')] = U_nl
params[_p(prefix, 'b_nl')] = np.zeros((2 * dim_nonlin,)).astype('float32')
Ux_nl = ortho_weight(dim_nonlin)
params[_p(prefix, 'Ux_nl')] = Ux_nl
params[_p(prefix, 'bx_nl')] = np.zeros((dim_nonlin,)).astype('float32')
# context to LSTM
Wc = norm_weight(dimctx, dim * 2)
params[_p(prefix, 'Wc')] = Wc
Wcx = norm_weight(dimctx, dim)
params[_p(prefix, 'Wcx')] = Wcx
# attention: combined -> hidden
W_comb_att = norm_weight(dim, dimctx)
params[_p(prefix, 'W_comb_att')] = W_comb_att
# attention: context -> hidden
Wc_att = norm_weight(dimctx)
params[_p(prefix, 'Wc_att')] = Wc_att
# attention: hidden bias
b_att = np.zeros((dimctx,)).astype('float32')
params[_p(prefix, 'b_att')] = b_att
# attention:
U_att = norm_weight(dimctx, 1)
params[_p(prefix, 'U_att')] = U_att
c_att = np.zeros((1,)).astype('float32')
params[_p(prefix, 'c_tt')] = c_att
return params