def __init__(self,
X,
timesteps=1,
SRF=1,
SSN=9,
SSF=29,
strides=[1, 1, 1, 1],
padding='SAME',
aux=None):
"""Global initializations and settings."""
self.X = X
self.n, self.h, self.w, self.k = [int(x) for x in X.get_shape()]
self.timesteps = timesteps
self.strides = strides
self.padding = padding
# Sort through and assign the auxilliary variables
aux_vars = auxilliary_variables()
if aux is not None and isinstance(aux, dict):
for k, v in aux.iteritems():
aux_vars[k] = v
self.update_params(aux_vars)
# Kernel shapes
self.SRF, self.SSN, self.SSF = SRF, SSN, SSF
self.SSN_ext = 2 * py_utils.ifloor(SSN / 2.0) + 1
self.SSF_ext = 2 * py_utils.ifloor(SSF / 2.0) + 1
if self.SSN is None:
self.SSN = self.SRF * 3
if self.SSF is None:
self.SSF = self.SRF * 5
if self.separable:
self.q_shape = [self.SRF, self.SRF, 1, 1]
self.u_shape = [self.SRF, self.SRF, 1, 1]
self.p_shape = [self.SSN_ext, self.SSN_ext, 1, 1]
self.t_shape = [self.SSF_ext, self.SSF_ext, 1, 1]
else:
self.q_shape = [self.SRF, self.SRF, self.k, self.k]
self.u_shape = [self.SRF, self.SRF, self.k, 1]
self.p_shape = [self.SSN_ext, self.SSN_ext, self.k, self.k]
self.t_shape = [self.SSF_ext, self.SSF_ext, self.k, self.k]
self.i_shape = [self.gate_filter, self.gate_filter, self.k, self.k]
self.o_shape = [self.gate_filter, self.gate_filter, self.k, self.k]
self.bias_shape = [1, 1, 1, self.k]
self.tuning_params = ['Q', 'P', 'T'] # Learned connectivity
if self.association_field:
self.p_shape = [self.SSF_ext, self.SSF_ext, self.k, self.k] # T
self.tuning_params.pop(self.tuning_params.index('P'))
else:
self.tuning_params = ['Q', 'P', 'T']
self.tuning_shape = [1, 1, self.k, self.k]
# Nonlinearities and initializations
self.u_nl = tf.identity
self.t_nl = tf.identity
self.q_nl = tf.identity
self.p_nl = tf.identity
self.tuning_nl = interpret_nl(self.tuning_nl)
def __init__(self,
X,
model_version='full',
timesteps=1,
lesions=None,
SRF=1,
SSN=9,
SSF=29,
strides=[1, 1, 1, 1],
padding='SAME',
dropout=0.5,
dtype=tf.float32,
train=True,
return_weights=True):
self.X = X
self.train = train
self.dropout = dropout
self.n, self.h, self.w, self.k = [int(x) for x in X.get_shape()]
self.model_version = model_version
self.timesteps = timesteps
self.lesions = lesions
self.strides = strides
self.padding = padding
self.dtype = dtype
self.SRF, self.SSN, self.SSF = SRF, SSN, SSF
self.SSN_ext = 2 * py_utils.ifloor(SSN / 2.0) + 1
self.SSF_ext = 2 * py_utils.ifloor(SSF / 2.0) + 1
self.q_shape = [self.SRF, self.SRF, self.k, self.k]
self.u_shape = [self.SRF, self.SRF, self.k, 1]
self.p_shape = [self.SSN_ext, self.SSN_ext, self.k, self.k]
self.t_shape = [self.SSF_ext, self.SSF_ext, self.k, self.k]
self.i_shape = [self.SRF, self.SRF, self.k, self.k]
self.o_shape = [self.SRF, self.SRF, self.k, self.k]
self.u_nl = tf.identity
self.t_nl = tf.identity
self.q_nl = tf.identity
self.p_nl = tf.identity
self.tuning_nl = tf.nn.relu
self.tuning_shape = [1, 1, self.k, self.k]
self.tuning_params = ['Q', 'P', 'T'] # Learned connectivity
self.recurrent_nl = tf.nn.relu
self.gate_nl = tf.nn.sigmoid
self.return_weights = return_weights
self.normal_initializer = False
if self.SSN is None:
self.SSN = self.SRF * 3
if self.SSF is None:
self.SSF = self.SRF * 5
def __init__(
self,
X,
model_version='full_with_cell_states',
timesteps=1,
lesions=None,
SRF=1,
SSN=9,
SSF=29,
strides=[1, 1, 1, 1],
padding='SAME',
dtype=tf.float32,
return_weights=True):
self.X = X
self.n, self.h, self.w, self.k = [int(x) for x in X.get_shape()]
self.model_version = model_version
self.timesteps = timesteps
self.lesions = lesions
self.strides = strides
self.padding = padding
self.dtype = dtype
self.SRF, self.SSN, self.SSF = SRF, SSN, SSF
self.SSN_ext = 2 * py_utils.ifloor(SSN / 2.0) + 1
self.SSF_ext = 2 * py_utils.ifloor(SSF / 2.0) + 1
self.q_shape = [self.SRF, self.SRF, self.k, self.k]
self.u_shape = [self.SRF, self.SRF, self.k, 1]
self.p_shape = [self.SSN_ext, self.SSN_ext, self.k, self.k]
self.t_shape = [self.SSF_ext, self.SSF_ext, self.k, self.k]
self.i_shape = self.q_shape
self.o_shape = self.q_shape
self.u_nl = tf.identity
self.t_nl = tf.identity
self.q_nl = tf.identity
self.p_nl = tf.identity
self.i_nl = tf.nn.relu # input non linearity
self.o_nl = tf.nn.relu # output non linearity
self.return_weights = return_weights
self.normal_initializer = False
if self.SSN is None:
self.SSN = self.SRF * 3
if self.SSF is None:
self.SSF = self.SRF * 5
def __init__(self,
X,
timesteps=1,
SRF=1,
SSN=9,
SSF=29,
strides=[1, 1, 1, 1],
padding='SAME',
aux=None,
train=True):
"""Global initializations and settings."""
self.X = X
self.n, self.h, self.w, self.k = [int(x) for x in X.get_shape()]
self.timesteps = timesteps
self.strides = strides
self.padding = padding
self.train = train
# Sort through and assign the auxilliary variables
aux_vars = auxilliary_variables()
if aux is not None and isinstance(aux, dict):
for k, v in aux.iteritems():
aux_vars[k] = v
self.update_params(aux_vars)
# Kernel shapes
self.SRF, self.SSN, self.SSF = SRF, SSN, SSF
# if isinstance(SSN, list):
# self.SSN_ext = [2 * py_utils.ifloor(x / 2.0) + 1 for x in SSN]
# else:
# self.SSN_ext = 2 * py_utils.ifloor(SSN / 2.0) + 1
if isinstance(SSF, list):
self.SSF_ext = [2 * py_utils.ifloor(x / 2.0) + 1 for x in SSF]
else:
self.SSF_ext = 2 * py_utils.ifloor(SSF / 2.0) + 1
if self.SSN is None:
self.SSN = self.SRF * 3
if self.SSF is None:
self.SSF = self.SRF * 5
# if self.separable:
# self.q_shape = [self.SRF, self.SRF, 1, 1]
# self.u_shape = [self.SRF, self.SRF, 1, 1]
# self.p_shape = [self.SSF_ext, self.SSF_ext, 1, 1]
self.q_shape = [self.SRF, self.SRF, self.k, self.k]
self.u_shape = [self.SRF, self.SRF, self.k, 1]
if isinstance(SSF, list):
self.p_shape = [[ssf_ext, ssf_ext, self.k, self.k]
for ssf_ext in self.SSF_ext]
else:
self.p_shape = [self.SSF_ext, self.SSF_ext, self.k, self.k]
self.i_shape = [self.gate_filter, self.gate_filter, self.k, self.k]
self.o_shape = [self.gate_filter, self.gate_filter, self.k, self.k]
self.bias_shape = [1, 1, 1, self.k]
self.tuning_params = ['Q', 'P'] # Learned connectivity
self.tuning_shape = [1, 1, self.k, self.k]
# Nonlinearities and initializations
self.u_nl = tf.identity
self.q_nl = tf.identity
self.p_nl = tf.identity
# Set integration operations
self.ii, self.oi = self.interpret_integration(self.integration_type)
def prepare_tensors(self):
""" Prepare recurrent/forward weight matrices."""
self.weight_dict = { # Weights lower/activity upper
'U': {
'r': {
'weight': 'u_r',
'activity': 'U_r'
}
},
'P': {
'r': {
'weight': 'p_r',
'activity': 'P_r',
'tuning': 'p_t'
}
},
'Q': {
'r': {
'weight': 'q_r',
'activity': 'Q_r',
'tuning': 'q_t'
}
},
'I': {
'r': { # Recurrent state
'weight': 'i_r',
'bias': 'i_b',
'activity': 'I_r'
},
'f': { # Recurrent state
'weight': 'i_f',
'activity': 'I_f'
},
},
'O': {
'r': { # Recurrent state
'weight': 'o_r',
'bias': 'o_b',
'activity': 'O_r'
},
'f': { # Recurrent state
'weight': 'o_f',
'activity': 'O_f'
},
},
'xi': {
'r': { # Recurrent state
'weight': 'xi',
}
},
'alpha': {
'r': { # Recurrent state
'weight': 'alpha',
}
},
'beta': {
'r': { # Recurrent state
'weight': 'beta',
}
},
'mu': {
'r': { # Recurrent state
'weight': 'mu',
}
},
'nu': {
'r': { # Recurrent state
'weight': 'nu',
}
},
'zeta': {
'r': { # Recurrent state
'weight': 'zeta',
}
},
'gamma': {
'r': { # Recurrent state
'weight': 'gamma',
}
},
'phi': {
'r': { # Recurrent state
'weight': 'phi',
}
},
'kappa': {
'r': { # Recurrent state
'weight': 'kappa',
}
},
'delta': {
'r': { # Recurrent state
'weight': 'delta',
}
}
}
# tuned summation: pooling in h, w dimensions
#############################################
q_array = np.ones(self.q_shape) / np.prod(self.q_shape)
if 'Q' in self.lesions:
q_array = np.zeros_like(q_array).astype(np.float32)
print 'Lesioning CRF excitation.'
setattr(
self, self.weight_dict['Q']['r']['weight'],
tf.get_variable(name=self.weight_dict['Q']['r']['weight'],
dtype=self.dtype,
initializer=q_array.astype(np.float32),
trainable=False))
# untuned suppression: reduction across feature axis
####################################################
u_array = np.ones(self.u_shape) / np.prod(self.u_shape)
if 'U' in self.lesions:
u_array = np.zeros_like(u_array).astype(np.float32)
print 'Lesioning CRF inhibition.'
setattr(
self, self.weight_dict['U']['r']['weight'],
tf.get_variable(name=self.weight_dict['U']['r']['weight'],
dtype=self.dtype,
initializer=u_array.astype(np.float32),
trainable=False))
# weakly tuned summation: pooling in h, w dimensions
#############################################
if isinstance(self.p_shape[0], list) and 'P' not in self.lesions:
# VGG-style filters
for pidx, pext in enumerate(self.p_shape):
if pidx == 0:
it_key = self.weight_dict['P']['r']['weight']
else:
self.weight_dict['P']['r']['weight_%s' %
pidx] = 'p_r_%s' % pidx
it_key = self.weight_dict['P']['r']['weight_%s' % pidx]
setattr(
self, it_key,
tf.get_variable(
name=it_key,
dtype=self.dtype,
initializer=initialization.xavier_initializer(
shape=pext, uniform=self.normal_initializer),
trainable=True))
else:
p_array = np.ones(self.p_shape)
p_array[self.SSN // 2 -
py_utils.ifloor(self.SRF / 2.0):self.SSF // 2 +
py_utils.iceil(self.SSN / 2.0), self.SSN // 2 -
py_utils.ifloor(self.SRF / 2.0):self.SSF // 2 +
py_utils.iceil(self.SSN / 2.0), :, # exclude CRF!
:] = 0.0
p_array = p_array / p_array.sum()
if 'P' in self.lesions:
print 'Lesioning near eCRF.'
p_array = np.zeros_like(p_array).astype(np.float32)
# Association field is fully learnable
if self.association_field and 'P' not in self.lesions:
setattr(
self, self.weight_dict['P']['r']['weight'],
tf.get_variable(
name=self.weight_dict['P']['r']['weight'],
dtype=self.dtype,
initializer=initialization.xavier_initializer(
shape=self.p_shape,
uniform=self.normal_initializer),
trainable=True))
else:
setattr(
self, self.weight_dict['P']['r']['weight'],
tf.get_variable(name=self.weight_dict['P']['r']['weight'],
dtype=self.dtype,
initializer=p_array.astype(np.float32),
trainable=False))
# Connectivity tensors -- Q/P/T
if 'Q' in self.lesions:
print 'Lesioning CRF excitation connectivity.'
setattr(
self, self.weight_dict['Q']['r']['tuning'],
tf.get_variable(name=self.weight_dict['Q']['r']['tuning'],
dtype=self.dtype,
trainable=False,
initializer=np.zeros(self.tuning_shape).astype(
np.float32)))
else:
setattr(
self, self.weight_dict['Q']['r']['tuning'],
tf.get_variable(name=self.weight_dict['Q']['r']['tuning'],
dtype=self.dtype,
trainable=True,
initializer=initialization.xavier_initializer(
shape=self.tuning_shape,
uniform=self.normal_initializer,
mask=None)))
# Gate weights
setattr(
self, self.weight_dict['I']['r']['weight'],
tf.get_variable(name=self.weight_dict['I']['r']['weight'],
dtype=self.dtype,
trainable=True,
initializer=initialization.xavier_initializer(
shape=self.i_shape,
uniform=self.normal_initializer,
mask=None)))
setattr(
self, self.weight_dict['I']['f']['weight'],
tf.get_variable(name=self.weight_dict['I']['f']['weight'],
dtype=self.dtype,
trainable=True,
initializer=initialization.xavier_initializer(
shape=self.i_shape,
uniform=self.normal_initializer,
mask=None)))
setattr(
self, self.weight_dict['I']['r']['bias'],
tf.get_variable(name=self.weight_dict['I']['r']['bias'],
dtype=self.dtype,
trainable=True,
initializer=tf.ones(self.bias_shape)))
# Output
setattr(
self, self.weight_dict['O']['r']['weight'],
tf.get_variable(name=self.weight_dict['O']['r']['weight'],
dtype=self.dtype,
trainable=True,
initializer=initialization.xavier_initializer(
shape=self.o_shape,
uniform=self.normal_initializer,
mask=None)))
setattr(
self, self.weight_dict['O']['f']['weight'],
tf.get_variable(name=self.weight_dict['O']['f']['weight'],
dtype=self.dtype,
trainable=True,
initializer=initialization.xavier_initializer(
shape=self.o_shape,
uniform=self.normal_initializer,
mask=None)))
setattr( # TODO: smart initialization of these
self, self.weight_dict['O']['r']['bias'],
tf.get_variable(name=self.weight_dict['O']['r']['bias'],
dtype=self.dtype,
trainable=True,
initializer=tf.ones(self.bias_shape)))
# Degree of freedom weights (vectors)
w_array = np.ones([1, 1, 1, self.k]).astype(np.float32)
b_array = np.zeros([1, 1, 1, self.k]).astype(np.float32)
# Divisive params
self.alpha = tf.get_variable(name='alpha', initializer=w_array)
self.beta = tf.get_variable(name='beta', initializer=w_array)
# Subtractive params
self.mu = tf.get_variable(name='mu', initializer=b_array)
self.nu = tf.get_variable(name='nu', initializer=b_array)
if self.zeta:
self.zeta = tf.get_variable(name='zeta', initializer=w_array)
else:
self.zeta = tf.constant(1.)
if self.gamma:
self.gamma = tf.get_variable(name='gamma', initializer=w_array)
else:
self.gamma = tf.constant(1.)
if self.delta:
self.delta = tf.get_variable(name='delta', initializer=w_array)
else:
self.delta = tf.constant(1.)
if self.xi:
self.xi = tf.get_variable(name='xi', initializer=w_array)
else:
self.xi = tf.constant(1.)
if self.multiplicative_excitation:
self.kappa = tf.get_variable(name='kappa', initializer=w_array)
self.omega = tf.get_variable(name='omega', initializer=w_array)
else:
self.kappa = tf.constant(1.)
self.omega = tf.constant(1.)
def prepare_tensors(self):
""" Prepare recurrent/forward weight matrices."""
self.weight_dict = { # Weights lower/activity upper
'U': {
'r': {
'weight': 'u_r',
'activity': 'U_r'
}
},
'T': {
'r': {
'weight': 't_r',
'activity': 'T_r',
'tuning': 't_t'
}
},
'P': {
'r': {
'weight': 'p_r',
'activity': 'P_r',
'tuning': 'p_t'
}
},
'Q': {
'r': {
'weight': 'q_r',
'activity': 'Q_r',
'tuning': 'q_t'
}
},
'I': {
'r': { # Recurrent state
'weight': 'i_r',
'activity': 'I_r'
},
'f': { # Recurrent state
'weight': 'i_f',
'activity': 'I_f'
},
},
'O': {
'r': { # Recurrent state
'weight': 'o_r',
'activity': 'O_r'
},
'f': { # Recurrent state
'weight': 'o_f',
'activity': 'O_f'
},
},
'xi': {
'r': { # Recurrent state
'weight': 'xi',
}
},
'alpha': {
'r': { # Recurrent state
'weight': 'alpha',
}
},
'beta': {
'r': { # Recurrent state
'weight': 'beta',
}
},
'mu': {
'r': { # Recurrent state
'weight': 'mu',
}
},
'nu': {
'r': { # Recurrent state
'weight': 'nu',
}
},
'zeta': {
'r': { # Recurrent state
'weight': 'zeta',
}
},
'gamma': {
'r': { # Recurrent state
'weight': 'gamma',
}
},
'delta': {
'r': { # Recurrent state
'weight': 'delta',
}
}
}
# tuned summation: pooling in h, w dimensions
#############################################
q_array = np.ones(self.q_shape) / np.prod(self.q_shape)
setattr(
self, self.weight_dict['Q']['r']['weight'],
tf.get_variable(name=self.weight_dict['Q']['r']['weight'],
dtype=self.dtype,
initializer=q_array.astype(np.float32),
trainable=False))
# untuned suppression: reduction across feature axis
####################################################
u_array = np.ones(self.u_shape) / np.prod(self.u_shape)
setattr(
self, self.weight_dict['U']['r']['weight'],
tf.get_variable(name=self.weight_dict['U']['r']['weight'],
dtype=self.dtype,
initializer=u_array.astype(np.float32),
trainable=False))
# weakly tuned summation: pooling in h, w dimensions
#############################################
p_array = np.ones(self.p_shape)
p_array[self.SSN // 2 - py_utils.ifloor(self.SRF / 2.0):self.SSN // 2 +
py_utils.iceil(self.SRF / 2.0),
self.SSN // 2 - py_utils.ifloor(self.SRF / 2.0):self.SSN // 2 +
py_utils.iceil(self.SRF / 2.0), :, # exclude CRF!
:] = 0.0
p_array = p_array / p_array.sum()
setattr(
self, self.weight_dict['P']['r']['weight'],
tf.get_variable(name=self.weight_dict['P']['r']['weight'],
dtype=self.dtype,
initializer=p_array.astype(np.float32),
trainable=False))
# weakly tuned suppression: pooling in h, w dimensions
###############################################
t_array = np.ones(self.t_shape)
t_array[self.SSF // 2 - py_utils.ifloor(self.SSN / 2.0):self.SSF // 2 +
py_utils.iceil(self.SSN / 2.0),
self.SSF // 2 - py_utils.ifloor(self.SSN / 2.0):self.SSF // 2 +
py_utils.iceil(self.SSN / 2.0), :, # exclude near surround!
:] = 0.0
t_array = t_array / t_array.sum()
setattr(
self, self.weight_dict['T']['r']['weight'],
tf.get_variable(name=self.weight_dict['T']['r']['weight'],
dtype=self.dtype,
initializer=t_array.astype(np.float32),
trainable=False))
# Connectivity tensors -- Q/P/T
setattr(
self, self.weight_dict['Q']['r']['tuning'],
tf.get_variable(name=self.weight_dict['Q']['r']['tuning'],
dtype=self.dtype,
initializer=initialization.xavier_initializer(
shape=self.tuning_shape,
uniform=self.normal_initializer,
mask=None)))
setattr(
self, self.weight_dict['P']['r']['tuning'],
tf.get_variable(name=self.weight_dict['P']['r']['tuning'],
dtype=self.dtype,
initializer=initialization.xavier_initializer(
shape=self.tuning_shape,
uniform=self.normal_initializer,
mask=None)))
setattr(
self, self.weight_dict['T']['r']['tuning'],
tf.get_variable(name=self.weight_dict['T']['r']['tuning'],
dtype=self.dtype,
initializer=initialization.xavier_initializer(
shape=self.tuning_shape,
uniform=self.normal_initializer,
mask=None)))
# Input
setattr(
self, self.weight_dict['I']['r']['weight'],
tf.get_variable(name=self.weight_dict['I']['r']['weight'],
dtype=self.dtype,
initializer=initialization.xavier_initializer(
shape=self.i_shape,
uniform=self.normal_initializer,
mask=None)))
setattr(
self, self.weight_dict['I']['f']['weight'],
tf.get_variable(name=self.weight_dict['I']['f']['weight'],
dtype=self.dtype,
initializer=initialization.xavier_initializer(
shape=self.i_shape,
uniform=self.normal_initializer,
mask=None)))
# Output
setattr(
self, self.weight_dict['O']['r']['weight'],
tf.get_variable(name=self.weight_dict['O']['r']['weight'],
dtype=self.dtype,
initializer=initialization.xavier_initializer(
shape=self.o_shape,
uniform=self.normal_initializer,
mask=None)))
setattr(
self, self.weight_dict['O']['f']['weight'],
tf.get_variable(name=self.weight_dict['O']['f']['weight'],
dtype=self.dtype,
initializer=initialization.xavier_initializer(
shape=self.o_shape,
uniform=self.normal_initializer,
mask=None)))
# Vector weights
w_array = np.ones([1, 1, 1, self.k]).astype(np.float32)
b_array = np.zeros([1, 1, 1, self.k]).astype(np.float32)
self.xi = tf.get_variable(name='xi', initializer=w_array)
self.alpha = tf.get_variable(name='alpha', initializer=w_array)
self.beta = tf.get_variable(name='beta', initializer=w_array)
self.mu = tf.get_variable(name='mu', initializer=b_array)
self.nu = tf.get_variable(name='nu', initializer=b_array)
self.zeta = tf.get_variable(name='zeta', initializer=w_array)
self.gamma = tf.get_variable(name='gamma', initializer=w_array)
self.delta = tf.get_variable(name='delta', initializer=w_array)
def prepare_tensors(self):
""" Prepare recurrent/forward weight matrices."""
self.weight_dict = { # Weights lower/activity upper
'U': {
'r': {
'weight': 'u_r',
'activity': 'U_r'
},
'f': {
'weight': 'u_f',
'bias': 'ub_f',
'activity': 'U_f'
}
},
'T': {
'r': {
'weight': 't_r',
'activity': 'T_r'
},
'f': {
'weight': 't_f',
'bias': 'tb_f',
'activity': 'T_f'
}
},
'P': {
'r': {
'weight': 'p_r',
'activity': 'P_r'
},
'f': {
'weight': 'p_f',
'bias': 'pb_f',
'activity': 'P_f'
}
},
'Q': {
'r': {
'weight': 'q_r',
'activity': 'Q_r'
},
'f': {
'weight': 'q_f',
'bias': 'qb_f',
'activity': 'Q_f'
}
},
'I': {
'r': { # Recurrent state
'weight': 'i_r',
'activity': 'I_r'
}
},
'O': {
'r': { # Recurrent state
'weight': 'o_r',
'activity': 'O_r'
}
}
}
# tuned summation: pooling in h, w dimensions
#############################################
setattr(
self, self.weight_dict['Q']['r']['weight'],
tf.get_variable(name=self.weight_dict['Q']['r']['weight'],
dtype=self.dtype,
initializer=initialization.xavier_initializer(
shape=self.q_shape,
uniform=self.normal_initializer,
mask=None)))
# untuned suppression: reduction across feature axis
####################################################
setattr(
self, self.weight_dict['U']['r']['weight'],
tf.get_variable(name=self.weight_dict['U']['r']['weight'],
dtype=self.dtype,
initializer=initialization.xavier_initializer(
shape=self.u_shape,
uniform=self.normal_initializer,
mask=None)))
# tuned summation: pooling in h, w dimensions
#############################################
p_array = np.zeros(self.p_shape)
for pdx in range(self.k):
p_array[:self.SSN, :self.SSN, pdx, pdx] = 1.0
p_array[self.SSN // 2 - py_utils.ifloor(self.SRF / 2.0):self.SSN // 2 +
py_utils.iceil(self.SRF / 2.0),
self.SSN // 2 - py_utils.ifloor(self.SRF / 2.0):self.SSN // 2 +
py_utils.iceil(self.SRF / 2.0), :, # exclude CRF!
:] = 0.0
setattr(
self, self.weight_dict['P']['r']['weight'],
tf.get_variable(name=self.weight_dict['P']['r']['weight'],
dtype=self.dtype,
initializer=p_array.astype(np.float32),
trainable=False))
# tuned suppression: pooling in h, w dimensions
###############################################
t_array = np.zeros(self.t_shape)
for tdx in range(self.k):
t_array[:self.SSF, :self.SSF, tdx, tdx] = 1.0
t_array[self.SSF // 2 - py_utils.ifloor(self.SSN / 2.0):self.SSF // 2 +
py_utils.iceil(self.SSN / 2.0),
self.SSF // 2 - py_utils.ifloor(self.SSN / 2.0):self.SSF // 2 +
py_utils.iceil(self.SSN / 2.0), :, # exclude near surround!
:] = 0.0
setattr(
self, self.weight_dict['T']['r']['weight'],
tf.get_variable(name=self.weight_dict['T']['r']['weight'],
dtype=self.dtype,
initializer=t_array.astype(np.float32),
trainable=False))
# Scalar weights
self.xi = tf.get_variable(name='xi', initializer=1.)
self.alpha = tf.get_variable(name='alpha', initializer=1.)
self.beta = tf.get_variable(name='beta', initializer=1.)
self.mu = tf.get_variable(name='mu', initializer=1.)
self.nu = tf.get_variable(name='nu', initializer=1.)
self.zeta = tf.get_variable(name='zeta', initializer=1.)
self.gamma = tf.get_variable(name='gamma', initializer=1.)
self.delta = tf.get_variable(name='delta', initializer=1.)
self.eps = tf.get_variable(name='eps', initializer=1.)
self.eta = tf.get_variable(name='eta', initializer=1.)
self.sig = tf.get_variable(name='sig', initializer=1.)
self.tau = tf.get_variable(name='tau', initializer=1.)
def contextual_div_norm_2d(x,
CRF_sum_window,
CRF_sup_window,
eCRF_sum_window,
eCRF_sup_window,
strides,
padding,
gamma=None,
beta=None,
eps=1.0,
scope="dn",
name="dn_out",
return_mean=False):
"""Applies divisive normalization on CNN feature maps.
Collect mean and variances on x on a local window across channels.
And apply normalization as below:
x_ = gamma * (x - mean) / sqrt(var + eps) + beta
https://github.com/renmengye/div-norm/blob/master/div_norm.py
Args:
x: Input tensor, [B, H, W, C].
sum_window: Summation window size, [H_sum, W_sum].
sup_window: Suppression window size, [H_sup, W_sup].
gamma: Scaling parameter.
beta: Bias parameter.
eps: Denominator bias.
return_mean: Whether to also return the computed mean.
Returns:
normed: Divisive-normalized variable.
mean: Mean used for normalization (optional).
"""
if not isinstance(CRF_sum_window, list):
CRF_sum_window = list(np.repeat(CRF_sum_window, 2))
if not isinstance(CRF_sup_window, list):
CRF_sup_window = list(np.repeat(CRF_sup_window, 2))
if not isinstance(eCRF_sum_window, list):
eCRF_sum_window = list(np.repeat(eCRF_sum_window, 2))
if not isinstance(eCRF_sup_window, list):
eCRF_sup_window = list(np.repeat(eCRF_sup_window, 2))
k = int(x.get_shape()[-1])
with tf.variable_scope(scope):
# Q
q_array = np.ones((CRF_sum_window + [k, k]))
q_array /= q_array.sum()
w_sum = tf.cast(tf.constant(q_array), tf.float32)
# U
u_array = np.ones((CRF_sum_window + [k, 1]))
u_array /= u_array.sum()
w_sup = tf.cast(tf.constant(u_array), tf.float32)
CRF_sum_window = CRF_sum_window[0]
CRF_sup_window = CRF_sup_window[0]
# P
p_shape = eCRF_sum_window + [k, k]
eCRF_sum_window = eCRF_sum_window[0]
p_array = np.zeros(p_shape)
for pdx in range(k):
p_array[:eCRF_sum_window, :eCRF_sum_window, pdx, pdx] = 1.0
p_array[eCRF_sum_window // 2 -
py_utils.ifloor(CRF_sum_window / 2.0):eCRF_sum_window // 2 +
py_utils.iceil(CRF_sum_window / 2.0), CRF_sum_window // 2 -
py_utils.ifloor(CRF_sum_window / 2.0):eCRF_sum_window // 2 +
py_utils.iceil(CRF_sum_window / 2.0), :, # exclude CRF!
:] = 0.0
w_esum = tf.cast(tf.constant(p_array) / p_array.sum(), tf.float32)
# T
t_shape = eCRF_sup_window + [k, k]
eCRF_sup_window = eCRF_sup_window[0]
t_array = np.zeros(t_shape)
for tdx in range(k):
t_array[:eCRF_sup_window, :eCRF_sup_window, tdx, tdx] = 1.0
t_array[eCRF_sup_window // 2 -
py_utils.ifloor(CRF_sup_window / 2.0):eCRF_sup_window // 2 +
py_utils.iceil(CRF_sup_window / 2.0), eCRF_sup_window // 2 -
py_utils.ifloor(CRF_sup_window / 2.0):eCRF_sup_window // 2 +
py_utils.iceil(CRF_sup_window /
2.0), :, # exclude near surround!
:] = 0.0
w_esup = tf.cast(tf.constant(t_array) / t_array.sum(), tf.float32)
# SUM
x_mean_CRF = tf.nn.conv2d(x, w_sum, strides=strides, padding=padding)
x_mean_eCRF = tf.nn.conv2d(x, w_esum, strides=strides, padding=padding)
normed = x - x_mean_CRF - x_mean_eCRF
x2 = tf.square(normed)
# SUP
x2_mean_CRF = tf.nn.conv2d(x2, w_sup, strides=strides, padding=padding)
x2_mean_eCRF = tf.nn.conv2d(x2,
w_esup,
strides=strides,
padding=padding)
denom = tf.sqrt(x2_mean_CRF + x2_mean_eCRF + eps)
normed = normed / denom
if gamma is not None:
normed *= gamma
if beta is not None:
normed += beta
normed = tf.identity(normed, name=name)
if return_mean:
return normed, x2
else:
return normed
def prepare_tensors(self):
""" Prepare recurrent/forward weight matrices."""
self.weight_dict = { # Weights lower/activity upper
'U': {
'r': {
'weight': 'u_r',
'activity': 'U_r'
}
},
'T': {
'r': {
'weight': 't_r',
'activity': 'T_r',
'tuning': 't_t'
}
},
'P': {
'r': {
'weight': 'p_r',
'activity': 'P_r',
'tuning': 'p_t'
}
},
'Q': {
'r': {
'weight': 'q_r',
'activity': 'Q_r',
'tuning': 'q_t'
}
},
'I': {
'r': { # Recurrent state
'weight': 'i_r',
'bias': 'i_b',
'activity': 'I_r'
},
'f': { # Recurrent state
'weight': 'i_f',
'activity': 'I_f'
},
},
'O': {
'r': { # Recurrent state
'weight': 'o_r',
'bias': 'o_b',
'activity': 'O_r'
},
'f': { # Recurrent state
'weight': 'o_f',
'activity': 'O_f'
},
},
'xi': {
'r': { # Recurrent state
'weight': 'xi',
}
},
'alpha': {
'r': { # Recurrent state
'weight': 'alpha',
}
},
'beta': {
'r': { # Recurrent state
'weight': 'beta',
}
},
'mu': {
'r': { # Recurrent state
'weight': 'mu',
}
},
'nu': {
'r': { # Recurrent state
'weight': 'nu',
}
},
'zeta': {
'r': { # Recurrent state
'weight': 'zeta',
}
},
'gamma': {
'r': { # Recurrent state
'weight': 'gamma',
}
},
'delta': {
'r': { # Recurrent state
'weight': 'delta',
}
}
}
# tuned summation: pooling in h, w dimensions
#############################################
q_array = np.ones(self.q_shape) / np.prod(self.q_shape)
if 'Q' in self.lesions:
q_array = np.zeros_like(q_array).astype(np.float32)
print 'Lesioning CRF excitation.'
setattr(
self, self.weight_dict['Q']['r']['weight'],
tf.get_variable(name=self.weight_dict['Q']['r']['weight'],
dtype=self.dtype,
initializer=q_array.astype(np.float32),
trainable=False))
# untuned suppression: reduction across feature axis
####################################################
u_array = np.ones(self.u_shape) / np.prod(self.u_shape)
if 'U' in self.lesions:
u_array = np.zeros_like(u_array).astype(np.float32)
print 'Lesioning CRF inhibition.'
setattr(
self, self.weight_dict['U']['r']['weight'],
tf.get_variable(name=self.weight_dict['U']['r']['weight'],
dtype=self.dtype,
initializer=u_array.astype(np.float32),
trainable=False))
# weakly tuned summation: pooling in h, w dimensions
#############################################
p_array = np.ones(self.p_shape)
#Try removing CRF punching
if self.exclude_CRF:
# Punch out the CRF
p_array[self.SSN // 2 -
py_utils.ifloor(self.SRF / 2.0):self.SSF // 2 +
py_utils.iceil(self.SSN / 2.0), self.SSN // 2 -
py_utils.ifloor(self.SRF / 2.0):self.SSF // 2 +
py_utils.iceil(self.SSN / 2.0), :, # exclude CRF!
:] = 0.0
p_array = p_array / p_array.sum()
if 'P' in self.lesions:
print 'Lesioning near eCRF.'
p_array = np.zeros_like(p_array).astype(np.float32)
# Association field is fully learnable
if self.association_field and 'P' not in self.lesions:
setattr(
self, self.weight_dict['P']['r']['weight'],
tf.get_variable(name=self.weight_dict['P']['r']['weight'],
dtype=self.dtype,
initializer=initialization.xavier_initializer(
shape=self.p_shape,
uniform=self.normal_initializer),
trainable=True))
else:
setattr(
self, self.weight_dict['P']['r']['weight'],
tf.get_variable(name=self.weight_dict['P']['r']['weight'],
dtype=self.dtype,
initializer=p_array.astype(np.float32),
trainable=False))
# weakly tuned suppression: pooling in h, w dimensions
###############################################
t_array = np.ones(self.t_shape)
#Try without punching CRF
if self.exclude_CRF:
# Punch out the CRF
t_array[self.SSF // 2 -
py_utils.ifloor(self.SSN / 2.0):self.SSF // 2 +
py_utils.iceil(self.SSN / 2.0), self.SSF // 2 -
py_utils.ifloor(self.SSN / 2.0):self.SSF // 2 +
py_utils.iceil(self.SSN /
2.0), :, # exclude near surround!
:] = 0.0
t_array = t_array / t_array.sum()
if 'T' in self.lesions:
print 'Lesioning Far eCRF.'
t_array = np.zeros_like(t_array).astype(np.float32)
#Always set full_far_eCRF to True/initialize with Xavier
if self.full_far_eCRF:
setattr(
self, self.weight_dict['T']['r']['weight'],
tf.get_variable(name=self.weight_dict['T']['r']['weight'],
dtype=self.dtype,
initializer=initialization.xavier_initializer(
shape=self.p_shape,
uniform=self.normal_initializer),
trainable=True))
else:
setattr(
self, self.weight_dict['T']['r']['weight'],
tf.get_variable(name=self.weight_dict['T']['r']['weight'],
dtype=self.dtype,
initializer=t_array.astype(np.float32),
trainable=False))
# Connectivity tensors -- Q/P/T
if 'Q' in self.lesions:
print 'Lesioning CRF excitation connectivity.'
setattr(
self, self.weight_dict['Q']['r']['tuning'],
tf.get_variable(name=self.weight_dict['Q']['r']['tuning'],
dtype=self.dtype,
trainable=False,
initializer=np.zeros(self.tuning_shape).astype(
np.float32)))
else:
setattr(
self, self.weight_dict['Q']['r']['tuning'],
tf.get_variable(name=self.weight_dict['Q']['r']['tuning'],
dtype=self.dtype,
trainable=True,
initializer=initialization.xavier_initializer(
shape=self.tuning_shape,
uniform=self.normal_initializer,
mask=None)))
if not self.association_field:
# Need a tuning tensor for near surround
if 'P' in self.lesions:
print 'Lesioning near eCRF connectivity.'
setattr(
self, self.weight_dict['P']['r']['tuning'],
tf.get_variable(name=self.weight_dict['P']['r']['tuning'],
dtype=self.dtype,
trainable=False,
initializer=np.zeros(
self.tuning_shape).astype(np.float32)))
else:
setattr(
self, self.weight_dict['P']['r']['tuning'],
tf.get_variable(
name=self.weight_dict['P']['r']['tuning'],
dtype=self.dtype,
trainable=True,
initializer=initialization.xavier_initializer(
shape=self.tuning_shape,
uniform=self.normal_initializer,
mask=None)))
#Again, full_far_eCRF should be set to True for now
import ipdb
ipdb.set_trace()
if not self.full_far_eCRF:
# Need a tuning tensor for near surround
if 'T' in self.lesions:
print 'Lesioning far eCRF connectivity.'
setattr(
self, self.weight_dict['T']['r']['tuning'],
tf.get_variable(name=self.weight_dict['T']['r']['tuning'],
dtype=self.dtype,
trainable=False,
initializer=np.zeros(
self.tuning_shape).astype(np.float32)))
else:
setattr(
self, self.weight_dict['T']['r']['tuning'],
tf.get_variable(name=self.weight_dict['T']['r']['tuning'],
dtype=self.dtype,
trainable=True,
initializer=initialization.xavier_initializer(
shape=self.tuning_shape,
uniform=self.normal_initializer,
mask=None)))
# Input
setattr(
self, self.weight_dict['I']['r']['weight'],
tf.get_variable(name=self.weight_dict['I']['r']['weight'],
dtype=self.dtype,
trainable=True,
initializer=initialization.xavier_initializer(
shape=self.i_shape,
uniform=self.normal_initializer,
mask=None)))
setattr(
self, self.weight_dict['I']['f']['weight'],
tf.get_variable(name=self.weight_dict['I']['f']['weight'],
dtype=self.dtype,
trainable=True,
initializer=initialization.xavier_initializer(
shape=self.i_shape,
uniform=self.normal_initializer,
mask=None)))
setattr(
self, self.weight_dict['I']['r']['bias'],
tf.get_variable(name=self.weight_dict['I']['r']['bias'],
dtype=self.dtype,
trainable=True,
initializer=tf.ones(self.bias_shape)))
# Output
setattr(
self, self.weight_dict['O']['r']['weight'],
tf.get_variable(name=self.weight_dict['O']['r']['weight'],
dtype=self.dtype,
trainable=True,
initializer=initialization.xavier_initializer(
shape=self.o_shape,
uniform=self.normal_initializer,
mask=None)))
setattr(
self, self.weight_dict['O']['f']['weight'],
tf.get_variable(name=self.weight_dict['O']['f']['weight'],
dtype=self.dtype,
trainable=True,
initializer=initialization.xavier_initializer(
shape=self.o_shape,
uniform=self.normal_initializer,
mask=None)))
setattr(
self, self.weight_dict['O']['r']['bias'],
tf.get_variable(name=self.weight_dict['O']['r']['bias'],
dtype=self.dtype,
trainable=True,
initializer=tf.ones(self.bias_shape)))
# Vector weights
w_array = np.ones([1, 1, 1, self.k]).astype(np.float32)
b_array = np.zeros([1, 1, 1, self.k]).astype(np.float32)
self.xi = tf.get_variable(name='xi', initializer=w_array)
self.alpha = tf.get_variable(name='alpha', initializer=w_array)
self.beta = tf.get_variable(name='beta', initializer=w_array)
self.mu = tf.get_variable(name='mu', initializer=b_array)
self.nu = tf.get_variable(name='nu', initializer=b_array)
self.zeta = tf.get_variable(name='zeta', initializer=w_array)
self.gamma = tf.get_variable(name='gamma', initializer=w_array)
self.delta = tf.get_variable(name='delta', initializer=w_array)
def prepare_tensors(self):
""" Prepare recurrent/forward weight matrices."""
self.weight_dict = { # Weights lower/activity upper
'U': {
'r': {
'weight': 'u_r',
'activity': 'U_r'
},
'f': {
'weight': 'u_f',
'bias': 'ub_f',
'activity': 'U_f'
}
},
'T': {
'r': {
'weight': 't_r',
'activity': 'T_r'
},
'f': {
'weight': 't_f',
'bias': 'tb_f',
'activity': 'T_f'
}
},
'P': {
'r': {
'weight': 'p_r',
'activity': 'P_r'
},
'f': {
'weight': 'p_f',
'bias': 'pb_f',
'activity': 'P_f'
}
},
'Q': {
'r': {
'weight': 'q_r',
'activity': 'Q_r'
},
'f': {
'weight': 'q_f',
'bias': 'qb_f',
'activity': 'Q_f'
}
},
'I': {
'r': { # Recurrent state
'weight': 'i_r',
'bias': 'ib_r',
'activity': 'I_r'
}
},
'O': {
'r': { # Recurrent state
'weight': 'o_r',
'bias': 'ob_r',
'activity': 'O_r'
}
}
}
# tuned summation: pooling in h, w dimensions
#############################################
setattr(
self,
self.weight_dict['Q']['r']['weight'],
tf.get_variable(
name=self.weight_dict['Q']['r']['weight'],
dtype=self.dtype,
initializer=initialization.xavier_initializer(
shape=self.q_shape,
uniform=self.normal_initializer,
mask=None)))
# untuned suppression: reduction across feature axis
####################################################
setattr(
self,
self.weight_dict['U']['r']['weight'],
tf.get_variable(
name=self.weight_dict['U']['r']['weight'],
dtype=self.dtype,
initializer=initialization.xavier_initializer(
shape=self.u_shape,
uniform=self.normal_initializer,
mask=None)))
# tuned summation: pooling in h, w dimensions
#############################################
p_array = np.zeros(self.p_shape)
for pdx in range(self.k):
p_array[:self.SSN, :self.SSN, pdx, pdx] = 1.0
p_array[
self.SSN // 2 - py_utils.ifloor(
self.SRF / 2.0):self.SSN // 2 + py_utils.iceil(
self.SRF / 2.0),
self.SSN // 2 - py_utils.ifloor(
self.SRF / 2.0):self.SSN // 2 + py_utils.iceil(
self.SRF / 2.0),
:, # exclude CRF!
:] = 0.0
setattr(
self,
self.weight_dict['P']['r']['weight'],
tf.get_variable(
name=self.weight_dict['P']['r']['weight'],
dtype=self.dtype,
initializer=initialization.xavier_initializer(
shape=self.p_shape,
uniform=self.normal_initializer,
mask=p_array)))
# tuned suppression: pooling in h, w dimensions
###############################################
t_array = np.zeros(self.t_shape)
for tdx in range(self.k):
t_array[:self.SSF, :self.SSF, tdx, tdx] = 1.0
t_array[
self.SSF // 2 - py_utils.ifloor(
self.SSN / 2.0):self.SSF // 2 + py_utils.iceil(
self.SSN / 2.0),
self.SSF // 2 - py_utils.ifloor(
self.SSN / 2.0):self.SSF // 2 + py_utils.iceil(
self.SSN / 2.0),
:, # exclude near surround!
:] = 0.0
setattr(
self,
self.weight_dict['T']['r']['weight'],
tf.get_variable(
name=self.weight_dict['T']['r']['weight'],
dtype=self.dtype,
initializer=initialization.xavier_initializer(
shape=self.t_shape,
uniform=self.normal_initializer,
mask=t_array)))
if self.model_version != 'no_input_facing':
# Also create input-facing weight matrices
# Q
setattr(
self,
self.weight_dict['Q']['f']['weight'],
tf.get_variable(
name=self.weight_dict['Q']['f']['weight'],
dtype=self.dtype,
initializer=initialization.xavier_initializer(
shape=self.q_shape,
uniform=self.normal_initializer)))
setattr(
self,
self.weight_dict['Q']['f']['bias'],
tf.get_variable(
name=self.weight_dict['Q']['f']['bias'],
dtype=self.dtype,
initializer=initialization.xavier_initializer(
shape=[self.q_shape[-1]],
uniform=self.normal_initializer)))
# U
setattr(
self,
self.weight_dict['U']['f']['weight'],
tf.get_variable(
name=self.weight_dict['U']['f']['weight'],
dtype=self.dtype,
initializer=initialization.xavier_initializer(
shape=self.u_shape,
uniform=self.normal_initializer)))
setattr(
self,
self.weight_dict['U']['f']['bias'],
tf.get_variable(
name=self.weight_dict['U']['f']['bias'],
dtype=self.dtype,
initializer=initialization.xavier_initializer(
[self.u_shape[-1]],
uniform=self.normal_initializer)))
# P
setattr(
self,
self.weight_dict['P']['f']['weight'],
tf.get_variable(
name=self.weight_dict['P']['f']['weight'],
dtype=self.dtype,
initializer=initialization.xavier_initializer(
self.p_shape,
uniform=self.normal_initializer,
mask=p_array)))
setattr(
self,
self.weight_dict['P']['f']['bias'],
tf.get_variable(
name=self.weight_dict['P']['f']['bias'],
dtype=self.dtype,
initializer=initialization.xavier_initializer(
[self.p_shape[-1]],
uniform=self.normal_initializer,
mask=None)))
# T
setattr(
self,
self.weight_dict['T']['f']['weight'],
tf.get_variable(
name=self.weight_dict['T']['f']['weight'],
dtype=self.dtype,
initializer=initialization.xavier_initializer(
shape=self.t_shape,
uniform=self.normal_initializer,
mask=t_array)))
setattr(
self,
self.weight_dict['T']['f']['bias'],
tf.get_variable(
name=self.weight_dict['T']['f']['bias'],
dtype=self.dtype,
initializer=initialization.xavier_initializer(
shape=[self.t_shape[-1]],
uniform=self.normal_initializer,
mask=None)))
if self.model_version == 'full_with_cell_states':
# Input
setattr(
self,
self.weight_dict['I']['r']['weight'],
tf.get_variable(
name=self.weight_dict['I']['r']['weight'],
dtype=self.dtype,
initializer=initialization.xavier_initializer(
shape=self.i_shape,
uniform=self.normal_initializer,
mask=None)))
setattr(
self,
self.weight_dict['I']['r']['bias'],
tf.get_variable(
name=self.weight_dict['I']['r']['bias'],
dtype=self.dtype,
initializer=initialization.xavier_initializer(
shape=[self.k],
uniform=self.normal_initializer,
mask=None)))
# Output
setattr(
self,
self.weight_dict['O']['r']['weight'],
tf.get_variable(
name=self.weight_dict['O']['r']['weight'],
dtype=self.dtype,
initializer=initialization.xavier_initializer(
shape=self.o_shape,
uniform=self.normal_initializer,
mask=None)))
setattr(
self,
self.weight_dict['O']['r']['bias'],
tf.get_variable(
name=self.weight_dict['O']['r']['bias'],
dtype=self.dtype,
initializer=initialization.xavier_initializer(
shape=[self.k],
uniform=self.normal_initializer,
mask=None)))
# Scalar weights
self.alpha = tf.get_variable(name='alpha', initializer=1.)
self.tau = tf.get_variable(name='tau', initializer=1.)
self.eta = tf.get_variable(name='eta', initializer=1.)
self.omega = tf.get_variable(name='omega', initializer=1.)
self.eps = tf.get_variable(name='eps', initializer=1.)
self.gamma = tf.get_variable(name='gamma', initializer=1.)
def prepare_tensors(self):
""" Prepare recurrent/forward weight matrices.
9 * k + (2 * k^2) params in the greek letters/gates.
(np.prod([h, w, k]) / 2) - k params in the surround filter
"""
self.weight_dict = { # Weights lower/activity upper
'P': {
'r': {
'weight': 'p_r',
'activity': 'P_r',
'tuning': 'p_t',
# 'bias': 'i_b'
}
},
'I': {
'r': { # Recurrent state
'weight': 'i_r',
'bias': 'i_b',
'activity': 'I_r'
},
# 'f': { # Recurrent state
# 'weight': 'i_f',
# 'activity': 'I_f'
# },
},
'O': {
'r': { # Recurrent state
'weight': 'o_r',
'bias': 'o_b',
'activity': 'O_r'
},
# 'f': { # Recurrent state
# 'weight': 'o_f',
# 'activity': 'O_f'
# },
},
'xi': {
'r': { # Recurrent state
'weight': 'xi',
}
},
# 'alpha': {
# 'r': { # Recurrent state
# 'weight': 'alpha',
# }
# },
'beta': {
'r': { # Recurrent state
'weight': 'beta',
}
},
# 'mu': {
# 'r': { # Recurrent state
# 'weight': 'mu',
# }
# },
'nu': {
'r': { # Recurrent state
'weight': 'nu',
}
},
'zeta': {
'r': { # Recurrent state
'weight': 'zeta',
}
},
'gamma': {
'r': { # Recurrent state
'weight': 'gamma',
}
},
'phi': {
'r': { # Recurrent state
'weight': 'phi',
}
},
'kappa': {
'r': { # Recurrent state
'weight': 'kappa',
}
},
'rho': {
'r': { # Recurrent state
'weight': 'rho',
}
},
}
# weakly tuned summation: pooling in h, w dimensions
#############################################
with tf.variable_scope('contextual_circuit'):
if isinstance(self.p_shape[0], list) and 'P' not in self.lesions:
# VGG-style filters
for pidx, pext in enumerate(self.p_shape):
if pidx == 0:
it_key = self.weight_dict['P']['r']['weight']
else:
self.weight_dict['P']['r']['weight_%s' %
pidx] = 'p_r_%s' % pidx
it_key = self.weight_dict['P']['r']['weight_%s' % pidx]
setattr(
self, it_key,
tf.get_variable(
name=it_key,
dtype=self.dtype,
initializer=initialization.xavier_initializer(
shape=pext, uniform=self.normal_initializer),
trainable=True))
else:
p_array = np.ones(self.p_shape)
p_array[self.SSN // 2 -
py_utils.ifloor(self.SRF / 2.0):self.SSF // 2 +
py_utils.iceil(self.SSN / 2.0), self.SSN // 2 -
py_utils.ifloor(self.SRF / 2.0):self.SSF // 2 +
py_utils.iceil(self.SSN / 2.0), :, # exclude CRF!
:] = 0.0
p_array = p_array / p_array.sum()
if 'P' in self.lesions:
print 'Lesioning near eCRF.'
p_array = np.zeros_like(p_array).astype(np.float32)
# Association field is fully learnable
if self.association_field and 'P' not in self.lesions:
setattr(
self,
self.weight_dict['P']['r']['weight'],
tf.get_variable(
name=self.weight_dict['P']['r']['weight'],
dtype=self.dtype,
# shape=self.p_shape,
initializer=initialization.xavier_initializer(
shape=self.p_shape,
uniform=self.normal_initializer),
trainable=True))
else:
setattr(
self, self.weight_dict['P']['r']['weight'],
tf.get_variable(
name=self.weight_dict['P']['r']['weight'],
dtype=self.dtype,
initializer=p_array.astype(np.float32),
trainable=False))
# Gate weights
setattr(
self, self.weight_dict['I']['r']['weight'],
tf.get_variable(name=self.weight_dict['I']['r']['weight'],
dtype=self.dtype,
trainable=True,
initializer=initialization.xavier_initializer(
shape=self.i_shape,
uniform=self.normal_initializer,
mask=None)))
# setattr(
# self,
# self.weight_dict['I']['f']['weight'],
# tf.get_variable(
# name=self.weight_dict['I']['f']['weight'],
# dtype=self.dtype,
# trainable=True,
# initializer=initialization.xavier_initializer(
# shape=self.i_shape,
# uniform=self.normal_initializer,
# mask=None)))
if self.gate_bias_init == 'chronos':
bias_init = -tf.log(
tf.random_uniform(
self.bias_shape, minval=1, maxval=self.timesteps - 1))
else:
bias_init = tf.ones(self.bias_shape)
setattr(
self, self.weight_dict['I']['r']['bias'],
tf.get_variable(name=self.weight_dict['I']['r']['bias'],
dtype=self.dtype,
trainable=True,
initializer=bias_init))
# Output
setattr(
self, self.weight_dict['O']['r']['weight'],
tf.get_variable(name=self.weight_dict['O']['r']['weight'],
dtype=self.dtype,
trainable=True,
initializer=initialization.xavier_initializer(
shape=self.o_shape,
uniform=self.normal_initializer,
mask=None)))
# setattr(
# self,
# self.weight_dict['O']['f']['weight'],
# tf.get_variable(
# name=self.weight_dict['O']['f']['weight'],
# dtype=self.dtype,
# trainable=True,
# initializer=initialization.xavier_initializer(
# shape=self.o_shape,
# uniform=self.normal_initializer,
# mask=None)))
if self.gate_bias_init == 'chronos':
# bias_init = -tf.log(
# tf.random_uniform(
# self.bias_shape, minval=1, maxval=self.timesteps - 1))
bias_init = -bias_init
else:
bias_init = tf.ones(self.bias_shape)
setattr( # TODO: smart initialization of these
self, self.weight_dict['O']['r']['bias'],
tf.get_variable(name=self.weight_dict['O']['r']['bias'],
dtype=self.dtype,
trainable=True,
initializer=bias_init))
# Degree of freedom weights (vectors)
w_shape = [1, 1, 1, self.k]
b_shape = [1, 1, 1, self.k]
# w_array = np.ones(w_shape).astype(np.float32)
# b_array = np.zeros(b_shape).astype(np.float32)
# Divisive params
if self.beta and not self.lesion_beta:
self.beta = tf.get_variable(
name='beta',
initializer=initialization.xavier_initializer(
shape=w_shape,
uniform=self.normal_initializer,
mask=None))
# initializer=tf.ones(w_shape, dtype=tf.float32))
elif self.lesion_beta:
self.beta = tf.constant(0.)
else:
self.beta = tf.constant(1.)
if self.nu and not self.lesion_nu:
self.nu = tf.get_variable(
name='nu',
initializer=initialization.xavier_initializer(
shape=b_shape,
uniform=self.normal_initializer,
mask=None))
# initializer=tf.zeros(b_shape, dtype=tf.float32))
elif self.lesion_nu:
self.nu = tf.constant(0.)
else:
self.nu = tf.constant(1.)
if self.zeta:
self.zeta = tf.get_variable(
name='zeta',
initializer=initialization.xavier_initializer(
shape=w_shape,
uniform=self.normal_initializer,
mask=None))
else:
self.zeta = tf.constant(1.)
if self.gamma:
self.gamma = tf.get_variable(
name='gamma',
initializer=initialization.xavier_initializer(
shape=w_shape,
uniform=self.normal_initializer,
mask=None))
else:
self.gamma = tf.constant(1.)
# # TODO
# self.ebias = tf.get_variable(
# name='ebias',
# initializer=initialization.xavier_initializer(
# shape=b_shape,
# uniform=self.normal_initializer,
# mask=None))
if self.xi:
self.xi = tf.get_variable(
name='xi',
initializer=initialization.xavier_initializer(
shape=w_shape,
uniform=self.normal_initializer,
mask=None))
else:
self.xi = tf.constant(1.)
if self.multiplicative_excitation:
if self.lesion_kappa:
self.kappa = tf.constant(0.)
else:
self.kappa = tf.get_variable(
name='kappa',
initializer=initialization.xavier_initializer(
shape=w_shape,
uniform=self.normal_initializer,
mask=None))
# initializer=tf.zeros(w_shape, dtype=tf.float32) + 0.5)
if self.lesion_omega:
self.omega = tf.constant(0.)
else:
self.omega = tf.get_variable(
name='omega',
initializer=initialization.xavier_initializer(
shape=w_shape,
uniform=self.normal_initializer,
mask=None))
# initializer=tf.zeros(w_shape, dtype=tf.float32) + 0.5)
else:
self.kappa = tf.constant(1.)
self.omega = tf.constant(1.)
if self.adapation:
self.rho = tf.get_variable(name='rho',
initializer=tf.ones(
self.timesteps,
dtype=tf.float32))
if self.lesion_omega:
self.omega = tf.constant(0.)
if self.lesion_kappa:
self.kappa = tf.constant(0.)
self.lateral_bias = tf.get_variable(
name='lateral_bias',
initializer=initialization.xavier_initializer(
shape=b_shape, uniform=self.normal_initializer, mask=None))
