'Initializes the parameters and auxiliary states. By default this function
does nothing. Subclass should override this method if contains parameters.
Parameters
initializer : Initializer
Called to initialize parameters if needed.
arg_params : dict
If not ``None``, should be a dictionary of existing `arg_params`. Initialization
will be copied from that.
aux_params : dict
If not ``None``, should be a dictionary of existing `aux_params`. Initialization
will be copied from that.
allow_missing : bool
If ``True``, params could contain missing values, and the initializer will be
called to fill those missing params.
force_init : bool
If ``True``, will force re-initialize even if already initialized.
allow_extra : boolean, optional
Whether allow extra parameters that are not needed by symbol.
If this is True, no error will be thrown when arg_params or aux_params
contain extra parameters that is not needed by the executor.'

def init_params(self, initializer=Uniform(0.01), arg_params=None, aux_params=None, allow_missing=False, force_init=False, allow_extra=False):

    pass
