def _simplify(self, node, function_lookup):
if len(node['lower_nodes']) == 0:
return
terminal_value_count = filter(lambda x:TerminalSet.is_terminal_value(x['node']), node['lower_nodes'])
if node['node']['arity'] == terminal_value_count:
value = self.execute_node(node, function_lookup, args=map(lambda x:x['node']['value'], node['lower_nodes']))
self.log().debug('Replacing existing node: %s' % pformat(node['node']))
node['lower_nodes'] = []
node['node'] = TerminalSet.terminal_value(value)
self.log().debug(' -- with node: %s' % pformat(node['node']))
self.is_simplified = False
else:
map(lambda x:self._simplify(x, function_lookup), node['lower_nodes'])
def _create_new_node(self, depth, node):
node_set = []
if depth == 1:
node_set = self.function_set
elif depth >= self.max_depth:
node_set = self.terminal_set
else:
node_set = self.function_set * self.function_bias + self.terminal_set
chosen_node = random.choice(node_set)
if not chosen_node.has_key('name'):
# this needs converting to a named node
value = chosen_node['function'](*chosen_node['args'])
chosen_node = TerminalSet.terminal_value(value)
node['node'] = chosen_node
node['lower_nodes'] = []
node['depth'] = depth
def t_basic_terminals(): ts = TerminalSet(__name__) ts.add_terminal_function(name='rand_int', func_ref=t_basic_rand_int, value_type='int', args=[0,9]) return ts