!984 Add unit test case for HWC2CHW.

Merge pull request !984 from Tinazhang/hwc2chw

tests/ut/python/dataset/test_HWC2CHW.py

+# Copyright 2020 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 numpy as np
+import mindspore.dataset.transforms.vision.c_transforms as c_vision
+import mindspore.dataset.transforms.vision.py_transforms as py_vision
+import mindspore.dataset as ds
+from mindspore import log as logger
+from util import diff_mse, visualize, save_and_check_md5
+
+GENERATE_GOLDEN = False
+
+DATA_DIR = ["../data/dataset/test_tf_file_3_images/train-0000-of-0001.data"]
+SCHEMA_DIR = "../data/dataset/test_tf_file_3_images/datasetSchema.json"
+
+
+def test_HWC2CHW(plot=False):
+    """
+    Test HWC2CHW
+    """
+    logger.info("Test HWC2CHW")
+
+    # First dataset
+    data1 = ds.TFRecordDataset(DATA_DIR, SCHEMA_DIR, columns_list=["image"], shuffle=False)
+    decode_op = c_vision.Decode()
+    hwc2chw_op = c_vision.HWC2CHW()
+    data1 = data1.map(input_columns=["image"], operations=decode_op)
+    data1 = data1.map(input_columns=["image"], operations=hwc2chw_op)
+
+    # Second dataset
+    data2 = ds.TFRecordDataset(DATA_DIR, SCHEMA_DIR, columns_list=["image"], shuffle=False)
+    data2 = data2.map(input_columns=["image"], operations=decode_op)
+
+    image_transposed = []
+    image = []
+    for item1, item2 in zip(data1.create_dict_iterator(), data2.create_dict_iterator()):
+        image_transposed.append(item1["image"].copy())
+        image.append(item2["image"].copy())
+
+        # check if the shape of data is transposed correctly
+        # transpose the original image from shape (H,W,C) to (C,H,W)
+        mse = diff_mse(item1['image'], item2['image'].transpose(2, 0, 1))
+        assert mse == 0
+    if plot:
+        visualize(image, image_transposed)
+
+
+def test_HWC2CHW_md5():
+    """
+    Test HWC2CHW(md5)
+    """
+    logger.info("Test HWC2CHW with md5 comparison")
+
+    # First dataset
+    data1 = ds.TFRecordDataset(DATA_DIR, SCHEMA_DIR, columns_list=["image"], shuffle=False)
+    decode_op = c_vision.Decode()
+    hwc2chw_op = c_vision.HWC2CHW()
+    data1 = data1.map(input_columns=["image"], operations=decode_op)
+    data1 = data1.map(input_columns=["image"], operations=hwc2chw_op)
+
+    # expected md5 from images
+    filename = "test_HWC2CHW_01_result.npz"
+    save_and_check_md5(data1, filename, generate_golden=GENERATE_GOLDEN)
+
+
+def test_HWC2CHW_comp(plot=False):
+    """
+    Test HWC2CHW between python and c image augmentation
+    """
+    logger.info("Test HWC2CHW with c_transform and py_transform comparison")
+
+    # First dataset
+    data1 = ds.TFRecordDataset(DATA_DIR, SCHEMA_DIR, columns_list=["image"], shuffle=False)
+    decode_op = c_vision.Decode()
+    hwc2chw_op = c_vision.HWC2CHW()
+    data1 = data1.map(input_columns=["image"], operations=decode_op)
+    data1 = data1.map(input_columns=["image"], operations=hwc2chw_op)
+
+    # Second dataset
+    data2 = ds.TFRecordDataset(DATA_DIR, SCHEMA_DIR, columns_list=["image"], shuffle=False)
+    transforms = [
+        py_vision.Decode(),
+        py_vision.ToTensor(),
+        py_vision.HWC2CHW()
+    ]
+    transform = py_vision.ComposeOp(transforms)
+    data2 = data2.map(input_columns=["image"], operations=transform())
+
+    image_c_transposed = []
+    image_py_transposed = []
+    for item1, item2 in zip(data1.create_dict_iterator(), data2.create_dict_iterator()):
+        c_image = item1["image"]
+        py_image = (item2["image"].transpose(1, 2, 0) * 255).astype(np.uint8)
+
+        # compare images between that applying c_transform and py_transform
+        mse = diff_mse(py_image, c_image)
+        # the images aren't exactly the same due to rounding error
+        assert mse < 0.001
+
+        image_c_transposed.append(item1["image"].copy())
+        image_py_transposed.append(item2["image"].copy())
+
+    if plot:
+        visualize(image_c_transposed, image_py_transposed)
+
+
+if __name__ == '__main__':
+    test_HWC2CHW()
+    test_HWC2CHW_md5()
+    test_HWC2CHW_comp()