function wpf_batch_gforms_init() {

    $search_criteria = array(
        'field_filters' => array(
            array(
                'key'      => 'wpf_complete',
                'value'    => '1',
                'operator' => '!=',
            ),
        ),
    );

    $form_ids = array( 1, 3, 5 );

    $entry_ids = GFAPI::get_entry_ids( $form_ids, $search_criteria );

    return $entry_ids;

}

add_filter( 'wpf_batch_gravity_forms_init', 'wpf_batch_gforms_init', 20 );