def is_activated(self, images, augmenter, parents, default):
if self.activator is None:<EOL><INDENT>return default<EOL><DEDENT>else:<EOL><INDENT>return self.activator(images, augmenter, parents, default)<EOL><DEDENT>
Returns whether an augmenter may be executed.

Returns
-------
bool
    If True, the augmenter may be executed. If False, it may not be executed.