def _build_fwd_pass_vars(self):
#can't just inherit from parent due to gradient building
self._build_fwd_pass_vars_core()
self._activation_vars = self._build_activation_vars(
self._get_input_activation_vars())
self._reference_vars = self._build_reference_vars()
self._diff_from_reference_vars = self._build_diff_from_reference_vars()
self._gradient_at_default_activation =\
self._get_gradient_at_activation(self.get_reference_vars())
self._pos_contribs, self._neg_contribs =\
self._build_pos_and_neg_contribs()
self._pos_mxts = B.zeros_like(self.get_activation_vars())
self._neg_mxts = B.zeros_like(self.get_activation_vars())
def _build_fwd_pass_vars(self):
"""
It is important that all the outputs of the Node have been
built before the node is built, otherwise the value of
mxts will not be correct
"""
self._build_fwd_pass_vars_core()
self._activation_vars =\
self._build_activation_vars(
self._get_input_activation_vars())
self._reference_vars =\
self._build_reference_vars()
self._diff_from_reference_vars =\
self._build_diff_from_reference_vars()
self._pos_contribs, self._neg_contribs =\
self._build_pos_and_neg_contribs()
self._pos_mxts = B.zeros_like(self.get_activation_vars())
self._neg_mxts = B.zeros_like(self.get_activation_vars())
def compute_mult_for_sum_then_transform(
diff_def_act_input_vars_list, diff_def_act_output, mult_output):
sum_diff_def_input_vars = B.zeros_like(diff_def_act_input_vars_list[0])
for diff_def_act_var in diff_def_act_input_vars_list:
sum_diff_def_input_vars += diff_def_act_var
pc_sum_diff_def_input_vars = pseudocount_near_zero(sum_diff_def_input_vars)
scale_factor = diff_def_act_output/pc_sum_diff_def_input_vars
#the multiplier ends up being the same for all the inputs, as
#they were just summed
multiplier_inp = scale_factor*mult_output
return [multiplier_inp for x in diff_def_act_input_vars_list]
def reset_mxts_updated(self):
for output_layer in self._output_layers:
output_layer.reset_mxts_updated()
self._mxts = B.zeros_like(self.get_activation_vars())
self._mxts_updated = False
self._mxts_for_inputs_updated = False
def _build_fwd_pass_vars(self):
self._reference_vars = self._build_reference_vars()
self._diff_from_reference_vars = self._build_diff_from_reference_vars()
self._mxts = B.zeros_like(self.get_activation_vars())
