mindspore/tests/ut/python/dataset/test_random_dataset.py

# Copyright 2019 Huawei Technologies Co., Ltd
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# ==============================================================================
import mindspore.common.dtype as mstype
import mindspore.dataset as ds
from pathlib import Path

# just a basic test with parallel random data op
def test_randomdataset_basic1():
    print("Test randomdataset basic")

    schema = ds.Schema()
    schema.add_column('image', de_type=mstype.uint8, shape=[2])
    schema.add_column('label', de_type=mstype.uint8, shape=[1])

    # apply dataset operations
    ds1 = ds.RandomDataset(schema=schema, num_samples=50, num_parallel_workers=4)
    ds1 = ds1.repeat(4)

    num_iter = 0
    for data in ds1.create_dict_iterator():  # each data is a dictionary
        # in this example, each dictionary has keys "image" and "label"
        print("{} image: {}".format(num_iter, data["image"]))
        print("{} label: {}".format(num_iter, data["label"]))
        num_iter += 1

    print("Number of data in ds1: ", num_iter)
    assert(num_iter == 200)

# Another simple test
def test_randomdataset_basic2():
    print("Test randomdataset basic 2")

    schema = ds.Schema()
    schema.add_column('image', de_type=mstype.uint8, shape=[640,480,3]) # 921600 bytes (a bit less than 1 MB per image)
    schema.add_column('label', de_type=mstype.uint8, shape=[1])

    # Make up about 10 samples
    ds1 = ds.RandomDataset(schema=schema, num_samples=10, num_parallel_workers=1)

    # cache size allows for about 4 images since each image just a bit less than 1MB, after that we will have to spill
    ds1 = ds1.repeat(4)

    num_iter = 0
    for data in ds1.create_dict_iterator():  # each data is a dictionary
        # in this example, each dictionary has keys "image" and "label"
        #print(data["image"])
        print("printing the label: {}".format(data["label"]))
        num_iter += 1

    print("Number of data in ds1: ", num_iter)
    assert(num_iter == 40)


if __name__ == '__main__':
    test_randomdataset_basic1()
    test_randomdataset_basic2()
    print('test_randomdataset_basic Ended.\n')