simplify_dataset.py

import numpy as np
import os
import argparse


parser = argparse.ArgumentParser()
parser.add_argument('--dataset_root', default=None, required=True)


def simplify_grasp_labels(root, save_path):
    """
    original dataset grasp_label files have redundant data,  We can significantly save the memory cost
    """
    obj_names = list(range(88))
    if not os.path.exists(save_path):
        os.makedirs(save_path)
    for i in obj_names:
        print('\nsimplifying object {}:'.format(i))
        label = np.load(os.path.join(root, 'grasp_label', '{}_labels.npz'.format(str(i).zfill(3))))
        # point_num = len(label['points'])
        print('original shape:               ', label['points'].shape, label['offsets'].shape, label['scores'].shape)
        # if point_num > 4820:
        #     idxs = np.random.choice(point_num, 4820, False)
        #     points = label['points'][idxs]
        #     offsets = label['offsets'][idxs]
        #     scores = label['scores'][idxs]
        #     print('Warning!!!  down sample object {}'.format(i))
        # else:
        points = label['points']
        scores = label['scores']
        offsets = label['offsets']
        width = offsets[:, :, :, :, 2]
        print('after simplify, offset shape: ', points.shape, scores.shape, width.shape)
        np.savez(os.path.join(save_path, '{}_labels.npz'.format(str(i).zfill(3))),
                 points=points, scores=scores, width=width)


if __name__ == '__main__':
    cfgs = parser.parse_args()
    root = cfgs.dataset_root  # set root and save path
    save_path = os.path.join(root, 'grasp_label_simplified')
    simplify_grasp_labels(root, save_path)