def get_parameters_nodes(input_nodes):
    """Find operations containing the parameters of the model.

     Args:
        input_nodes (:obj:`list` of :obj:`Node`): the input operations of the
            model.

     Returns:
        parameters (:obj:`list` of :obj:`Node`): the operations containing
            the parameters of the model.

    """

    parameters = list()
    for node in input_nodes:
        if node.is_trainable:
            parameters.append(node)

    return parameters