support cpp invert operation

mindspore/ccsrc/minddata/dataset/api/python_bindings.cc

@@ -54,6 +54,7 @@
 #include "minddata/dataset/kernels/image/decode_op.h"
 #include "minddata/dataset/kernels/image/hwc_to_chw_op.h"
 #include "minddata/dataset/kernels/image/image_utils.h"
+#include "minddata/dataset/kernels/image/invert_op.h"
 #include "minddata/dataset/kernels/image/normalize_op.h"
 #include "minddata/dataset/kernels/image/pad_op.h"
 #include "minddata/dataset/kernels/image/random_color_adjust_op.h"
@@ -362,6 +363,10 @@ void bindTensorOps1(py::module *m) {
     .def(py::init<float, float, float, float, float, float>(), py::arg("meanR"), py::arg("meanG"), py::arg("meanB"),
          py::arg("stdR"), py::arg("stdG"), py::arg("stdB"));
 
+  (void)py::class_<InvertOp, TensorOp, std::shared_ptr<InvertOp>>(*m, "InvertOp",
+                                                                  "Tensor operation to apply invert on RGB images.")
+    .def(py::init<>());
+
   (void)py::class_<RescaleOp, TensorOp, std::shared_ptr<RescaleOp>>(
     *m, "RescaleOp", "Tensor operation to rescale an image. Takes scale and shift.")
     .def(py::init<float, float>(), py::arg("rescale"), py::arg("shift"));

mindspore/ccsrc/minddata/dataset/kernels/image/CMakeLists.txt

@@ -6,6 +6,7 @@ add_library(kernels-image OBJECT
     decode_op.cc
     hwc_to_chw_op.cc
     image_utils.cc
+    invert_op.cc
     normalize_op.cc
     pad_op.cc
     random_color_adjust_op.cc

mindspore/ccsrc/minddata/dataset/kernels/image/invert_op.cc

@@ -0,0 +1,57 @@
+/**
+ * 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.
+ */
+#include "minddata/dataset/kernels/image/invert_op.h"
+#include "minddata/dataset/kernels/image/image_utils.h"
+#include "minddata/dataset/core/cv_tensor.h"
+#include "minddata/dataset/util/status.h"
+
+namespace mindspore {
+namespace dataset {
+
+// only supports RGB images
+
+Status InvertOp::Compute(const std::shared_ptr<Tensor> &input, std::shared_ptr<Tensor> *output) {
+  IO_CHECK(input, output);
+
+  try {
+    std::shared_ptr<CVTensor> input_cv = CVTensor::AsCVTensor(input);
+    cv::Mat input_img = input_cv->mat();
+    if (!input_cv->mat().data) {
+      RETURN_STATUS_UNEXPECTED("Could not convert to CV Tensor");
+    }
+
+    if (input_cv->Rank() != 3) {
+      RETURN_STATUS_UNEXPECTED("Shape not <H,W,C>");
+    }
+    int num_channels = input_cv->shape()[2];
+    if (num_channels != 3) {
+      RETURN_STATUS_UNEXPECTED("The shape is incorrect: num of channels != 3");
+    }
+
+    auto output_cv = std::make_shared<CVTensor>(input_cv->shape(), input_cv->type());
+    RETURN_UNEXPECTED_IF_NULL(output_cv);
+
+    output_cv->mat() = cv::Scalar::all(255) - input_img;
+    *output = std::static_pointer_cast<Tensor>(output_cv);
+  }
+
+  catch (const cv::Exception &e) {
+    RETURN_STATUS_UNEXPECTED("Error in invert");
+  }
+  return Status::OK();
+}
+}  // namespace dataset
+}  // namespace mindspore

mindspore/ccsrc/minddata/dataset/kernels/image/invert_op.h

@@ -0,0 +1,44 @@
+/**
+ * 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.
+ */
+
+#ifndef DATASET_KERNELS_IMAGE_INVERT_OP_H
+#define DATASET_KERNELS_IMAGE_INVERT_OP_H
+
+#include <memory>
+#include <string>
+
+#include "minddata/dataset/core/tensor.h"
+#include "minddata/dataset/kernels/tensor_op.h"
+#include "minddata/dataset/util/status.h"
+
+namespace mindspore {
+namespace dataset {
+class InvertOp : public TensorOp {
+ public:
+  InvertOp() {}
+  ~InvertOp() = default;
+
+  // Description: A function that prints info about the node
+  void Print(std::ostream &out) const override { out << Name(); }
+
+  Status Compute(const std::shared_ptr<Tensor> &input, std::shared_ptr<Tensor> *output) override;
+
+  std::string Name() const override { return kInvertOp; }
+};
+}  // namespace dataset
+}  // namespace mindspore
+
+#endif  // DATASET_KERNELS_IMAGE_INVERT_OP_H

mindspore/ccsrc/minddata/dataset/kernels/tensor_op.h

@@ -92,6 +92,7 @@ constexpr char kDecodeOp[] = "DecodeOp";
 constexpr char kCenterCropOp[] = "CenterCropOp";
 constexpr char kCutOutOp[] = "CutOutOp";
 constexpr char kHwcToChwOp[] = "HwcToChwOp";
+constexpr char kInvertOp[] = "InvertOp";
 constexpr char kNormalizeOp[] = "NormalizeOp";
 constexpr char kPadOp[] = "PadOp";
 constexpr char kRandomColorAdjustOp[] = "RandomColorAdjustOp";

mindspore/dataset/transforms/vision/c_transforms.py

@@ -71,6 +71,13 @@ def parse_padding(padding):
     return padding
 
 
+class Invert(cde.InvertOp):
+    """
+    Apply invert on input image in RGB mode.
+    does not have input arguments.
+    """
+
+
 class Decode(cde.DecodeOp):
     """
     Decode the input image in RGB mode.

tests/ut/python/dataset/test_invert.py

@@ -19,18 +19,20 @@ import numpy as np
 
 import mindspore.dataset.engine as de
 import mindspore.dataset.transforms.vision.py_transforms as F
+import mindspore.dataset.transforms.vision.c_transforms as C
 from mindspore import log as logger
-from util import visualize_list, save_and_check_md5
+from util import visualize_list, save_and_check_md5, diff_mse
 
 DATA_DIR = "../data/dataset/testImageNetData/train/"
 
 GENERATE_GOLDEN = False
 
-def test_invert(plot=False):
+
+def test_invert_py(plot=False):
     """
-    Test Invert
+    Test Invert python op
     """
-    logger.info("Test Invert")
+    logger.info("Test Invert Python op")
 
     # Original Images
     ds = de.ImageFolderDatasetV2(dataset_dir=DATA_DIR, shuffle=False)
@@ -52,7 +54,7 @@ def test_invert(plot=False):
                                         np.transpose(image, (0, 2, 3, 1)),
                                         axis=0)
 
-            # Color Inverted Images
+    # Color Inverted Images
     ds = de.ImageFolderDatasetV2(dataset_dir=DATA_DIR, shuffle=False)
 
     transforms_invert = F.ComposeOp([F.Decode(),
@@ -83,11 +85,143 @@ def test_invert(plot=False):
         visualize_list(images_original, images_invert)
 
 
-def test_invert_md5():
+def test_invert_c(plot=False):
     """
-    Test Invert with md5 check
+    Test Invert Cpp op
     """
-    logger.info("Test Invert with md5 check")
+    logger.info("Test Invert cpp op")
+
+    # Original Images
+    ds = de.ImageFolderDatasetV2(dataset_dir=DATA_DIR, shuffle=False)
+
+    transforms_original = [C.Decode(), C.Resize(size=[224, 224])]
+
+    ds_original = ds.map(input_columns="image",
+                         operations=transforms_original)
+
+    ds_original = ds_original.batch(512)
+
+    for idx, (image, _) in enumerate(ds_original):
+        if idx == 0:
+            images_original = image
+        else:
+            images_original = np.append(images_original,
+                                        image,
+                                        axis=0)
+
+    # Invert Images
+    ds = de.ImageFolderDatasetV2(dataset_dir=DATA_DIR, shuffle=False)
+
+    transform_invert = [C.Decode(), C.Resize(size=[224, 224]),
+                        C.Invert()]
+
+    ds_invert = ds.map(input_columns="image",
+                       operations=transform_invert)
+
+    ds_invert = ds_invert.batch(512)
+
+    for idx, (image, _) in enumerate(ds_invert):
+        if idx == 0:
+            images_invert = image
+        else:
+            images_invert = np.append(images_invert,
+                                      image,
+                                      axis=0)
+    if plot:
+        visualize_list(images_original, images_invert)
+
+    num_samples = images_original.shape[0]
+    mse = np.zeros(num_samples)
+    for i in range(num_samples):
+        mse[i] = diff_mse(images_invert[i], images_original[i])
+    logger.info("MSE= {}".format(str(np.mean(mse))))
+
+
+def test_invert_py_c(plot=False):
+    """
+    Test Invert Cpp op and python op
+    """
+    logger.info("Test Invert cpp and python op")
+
+    # Invert Images in cpp
+    ds = de.ImageFolderDatasetV2(dataset_dir=DATA_DIR, shuffle=False)
+    ds = ds.map(input_columns=["image"],
+                operations=[C.Decode(), C.Resize((224, 224))])
+
+    ds_c_invert = ds.map(input_columns="image",
+                         operations=C.Invert())
+
+    ds_c_invert = ds_c_invert.batch(512)
+
+    for idx, (image, _) in enumerate(ds_c_invert):
+        if idx == 0:
+            images_c_invert = image
+        else:
+            images_c_invert = np.append(images_c_invert,
+                                        image,
+                                        axis=0)
+
+    # invert images in python
+    ds = de.ImageFolderDatasetV2(dataset_dir=DATA_DIR, shuffle=False)
+    ds = ds.map(input_columns=["image"],
+                operations=[C.Decode(), C.Resize((224, 224))])
+
+    transforms_p_invert = F.ComposeOp([lambda img: img.astype(np.uint8),
+                                       F.ToPIL(),
+                                       F.Invert(),
+                                       np.array])
+
+    ds_p_invert = ds.map(input_columns="image",
+                         operations=transforms_p_invert())
+
+    ds_p_invert = ds_p_invert.batch(512)
+
+    for idx, (image, _) in enumerate(ds_p_invert):
+        if idx == 0:
+            images_p_invert = image
+        else:
+            images_p_invert = np.append(images_p_invert,
+                                        image,
+                                        axis=0)
+
+    num_samples = images_c_invert.shape[0]
+    mse = np.zeros(num_samples)
+    for i in range(num_samples):
+        mse[i] = diff_mse(images_p_invert[i], images_c_invert[i])
+    logger.info("MSE= {}".format(str(np.mean(mse))))
+
+    if plot:
+        visualize_list(images_c_invert, images_p_invert, visualize_mode=2)
+
+
+def test_invert_one_channel():
+    """
+     Test Invert cpp op with one channel image
+     """
+    logger.info("Test Invert C Op With One Channel Images")
+
+    c_op = C.Invert()
+
+    try:
+        ds = de.ImageFolderDatasetV2(dataset_dir=DATA_DIR, shuffle=False)
+        ds = ds.map(input_columns=["image"],
+                    operations=[C.Decode(),
+                                C.Resize((224, 224)),
+                                lambda img: np.array(img[:, :, 0])])
+
+        ds.map(input_columns="image",
+               operations=c_op)
+
+    except RuntimeError as e:
+        logger.info("Got an exception in DE: {}".format(str(e)))
+        assert "The shape" in str(e)
+
+
+def test_invert_md5_py():
+    """
+    Test Invert python op with md5 check
+    """
+    logger.info("Test Invert python op with md5 check")
 
     # Generate dataset
     ds = de.ImageFolderDatasetV2(dataset_dir=DATA_DIR, shuffle=False)
@@ -98,10 +232,34 @@ def test_invert_md5():
 
     data = ds.map(input_columns="image", operations=transforms_invert())
     # Compare with expected md5 from images
-    filename = "invert_01_result.npz"
+    filename = "invert_01_result_py.npz"
+    save_and_check_md5(data, filename, generate_golden=GENERATE_GOLDEN)
+
+
+def test_invert_md5_c():
+    """
+    Test Invert cpp op with md5 check
+    """
+    logger.info("Test Invert cpp op with md5 check")
+
+    # Generate dataset
+    ds = de.ImageFolderDatasetV2(dataset_dir=DATA_DIR, shuffle=False)
+
+    transforms_invert = [C.Decode(),
+                         C.Resize(size=[224, 224]),
+                         C.Invert(),
+                         F.ToTensor()]
+
+    data = ds.map(input_columns="image", operations=transforms_invert)
+    # Compare with expected md5 from images
+    filename = "invert_01_result_c.npz"
     save_and_check_md5(data, filename, generate_golden=GENERATE_GOLDEN)
 
 
 if __name__ == "__main__":
-    test_invert(plot=True)
+    test_invert_py(plot=False)
-    test_invert_md5()
+    test_invert_c(plot=False)
+    test_invert_py_c(plot=False)
+    test_invert_one_channel()
+    test_invert_md5_py()
+    test_invert_md5_c()