Python script to package the information of tracking benchmarks like LaSOT and GOT-10k into json files for Siamese network based trackers

############################################################################################
####                                Fot LaSOT dataset
############################################################################################
import os
import numpy as np
import json
import pdb 

LaSOT_path = "/home/wangxiao/Downloads/pysot/testing_dataset/LaSOT/"
video_files = os.listdir(LaSOT_path)
video_files = np.sort(video_files)

## use this class to avoid some array or other format issues in json.
class NumpyEncoder(json.JSONEncoder):
    """ Special json encoder for numpy types """
    def default(self, obj):
        if isinstance(obj, (np.int_, np.intc, np.intp, np.int8, np.int16, np.int32, np.int64, np.uint8, np.uint16, np.uint32, np.uint64)):
            return int(obj)
        elif isinstance(obj, (np.float_, np.float16, np.float32, np.float64)):
            return float(obj)
        elif isinstance(obj, (np.ndarray,)): #### This is the fix
            return obj.tolist()
        return json.JSONEncoder.default(self, obj)

dict = {}

# for idx in range(len(video_files)):
for idx in range(5): ## for test this code work or not.
    video_name = video_files[idx]
    img_path = LaSOT_path + video_name + '/img/'
    gt_path  = LaSOT_path + video_name + '/groundtruth.txt'

    print("==>> video Name: ", video_name, " current-index/total: ", idx, "/", len(video_files), ", please wait ... ")

    img_files = sorted([p for p in os.listdir(img_path) if os.path.splitext(p)[1] == '.jpg'])

    # pdb.set_trace()

    gt_files  = np.loadtxt(gt_path, delimiter=',')
    init_rect = gt_files[0]
    init_rect_first = init_rect.tolist()

    # pdb.set_trace()
    img_names_list = []
    gt_files_list = []

    #### for each image and ground truth
    for img_idx in range(len(img_files)):
        img_names = video_name + '/img/' + img_files[img_idx]
        img_names_list.append(img_names)
        gt_files_list.append(gt_files[img_idx])

    # pdb.set_trace()

    #### collect and save into one dict.
    dict_collect = {'video_dir': video_name, 'init_rect': init_rect_first, 'img_names': img_names_list, 'gt_rect': gt_files_list}
    dict[video_name] = dict_collect

dumped = json.dumps(dict, cls=NumpyEncoder)
with open('LaSOT_test.json', 'w+') as f:
    json.dump(dumped, f)

print("==>> Done !")

file = open('LaSOT_test.json','r',encoding='utf-8')
benchmark_info = json.load(file)
print(benchmark_info)

===================    Attention    ===================

when you load the json file, you will find:

" ... [541.0, 280.0, 76.0, 27.0]], "attr": [], "absent": []}}' "

there is a ' at the begining and end of the dict, directly load this json (I mean run the pysot tracker with this json file) will cause following errors:

File "/home/wangxiao/Downloads/pysot/toolkit/datasets/__init__.py", line 26, in create_dataset
   dataset = LaSOTDataset(**kwargs)

 File "/home/wangxiao/Downloads/pysot/toolkit/datasets/lasot.py", line 81, in __init__

   pbar = tqdm(meta_data.keys(), desc='loading '+name, ncols=100)

AttributeError: 'str' object has no attribute 'keys' 

Thus, you need to modify the lasot.py (about line 69):

meta_data = ast.literal_eval(meta_data)

to remove the two ' (this operation actually change the string to dict)

Of course, you also need to add this package: import ast 

Then, everything will be OK.

=========

Reference: https://www.cnblogs.com/sunshine2016/p/6197836.html