'Constructor.
Args:
is_training: See base class.
first_stage_features_stride: See base class.
reuse_weights: See base class.
weight_decay: See base class.
Raises:
ValueError: If `first_stage_features_stride` is not 8 or 16.'

def __init__(self, is_training, first_stage_features_stride, reuse_weights=None, weight_decay=0.0):

    if ((first_stage_features_stride != 8) and (first_stage_features_stride != 16)):
        raise ValueError('`first_stage_features_stride`    must    be    8    or    16.')
    super(FasterRCNNInceptionResnetV2FeatureExtractor, self).__init__(is_training, first_stage_features_stride, reuse_weights, weight_decay)
