Added Mixup

mindspore/ccsrc/minddata/dataset/api/python/bindings/dataset/kernels/image/bindings.cc

@@ -28,6 +28,7 @@
 #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/mixup_batch_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"
@@ -92,6 +93,12 @@ PYBIND_REGISTER(CenterCropOp, 1, ([](const py::module *m) {
                     .def(py::init<int32_t, int32_t>(), py::arg("height"), py::arg("width") = CenterCropOp::kDefWidth);
                 }));
 
+PYBIND_REGISTER(MixUpBatchOp, 1, ([](const py::module *m) {
+                  (void)py::class_<MixUpBatchOp, TensorOp, std::shared_ptr<MixUpBatchOp>>(
+                    *m, "MixUpBatchOp", "Tensor operation to mixup a batch of images")
+                    .def(py::init<float>(), py::arg("alpha"));
+                }));
+
 PYBIND_REGISTER(ResizeOp, 1, ([](const py::module *m) {
                   (void)py::class_<ResizeOp, TensorOp, std::shared_ptr<ResizeOp>>(
                     *m, "ResizeOp", "Tensor operation to resize an image. Takes height, width and mode")

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

@@ -21,7 +21,9 @@
 #include "minddata/dataset/kernels/image/crop_op.h"
 #include "minddata/dataset/kernels/image/cut_out_op.h"
 #include "minddata/dataset/kernels/image/decode_op.h"
+#include "minddata/dataset/kernels/image/mixup_batch_op.h"
 #include "minddata/dataset/kernels/image/normalize_op.h"
+#include "minddata/dataset/kernels/data/one_hot_op.h"
 #include "minddata/dataset/kernels/image/pad_op.h"
 #include "minddata/dataset/kernels/image/random_color_adjust_op.h"
 #include "minddata/dataset/kernels/image/random_crop_op.h"
@@ -81,6 +83,16 @@ std::shared_ptr<DecodeOperation> Decode(bool rgb) {
   return op;
 }
 
+// Function to create MixUpBatchOperation.
+std::shared_ptr<MixUpBatchOperation> MixUpBatch(float alpha) {
+  auto op = std::make_shared<MixUpBatchOperation>(alpha);
+  // Input validation
+  if (!op->ValidateParams()) {
+    return nullptr;
+  }
+  return op;
+}
+
 // Function to create NormalizeOperation.
 std::shared_ptr<NormalizeOperation> Normalize(std::vector<float> mean, std::vector<float> std) {
   auto op = std::make_shared<NormalizeOperation>(mean, std);
@@ -91,6 +103,16 @@ std::shared_ptr<NormalizeOperation> Normalize(std::vector<float> mean, std::vect
   return op;
 }
 
+// Function to create OneHotOperation.
+std::shared_ptr<OneHotOperation> OneHot(int32_t num_classes) {
+  auto op = std::make_shared<OneHotOperation>(num_classes);
+  // Input validation
+  if (!op->ValidateParams()) {
+    return nullptr;
+  }
+  return op;
+}
+
 // Function to create PadOperation.
 std::shared_ptr<PadOperation> Pad(std::vector<int32_t> padding, std::vector<uint8_t> fill_value,
                                   BorderType padding_mode) {
@@ -271,6 +293,20 @@ bool DecodeOperation::ValidateParams() { return true; }
 
 std::shared_ptr<TensorOp> DecodeOperation::Build() { return std::make_shared<DecodeOp>(rgb_); }
 
+// MixUpOperation
+MixUpBatchOperation::MixUpBatchOperation(float alpha) : alpha_(alpha) {}
+
+bool MixUpBatchOperation::ValidateParams() {
+  if (alpha_ < 0) {
+    MS_LOG(ERROR) << "MixUpBatch: alpha must be a positive floating value however it is: " << alpha_;
+    return false;
+  }
+
+  return true;
+}
+
+std::shared_ptr<TensorOp> MixUpBatchOperation::Build() { return std::make_shared<MixUpBatchOp>(alpha_); }
+
 // NormalizeOperation
 NormalizeOperation::NormalizeOperation(std::vector<float> mean, std::vector<float> std) : mean_(mean), std_(std) {}
 
@@ -292,6 +328,20 @@ std::shared_ptr<TensorOp> NormalizeOperation::Build() {
   return std::make_shared<NormalizeOp>(mean_[0], mean_[1], mean_[2], std_[0], std_[1], std_[2]);
 }
 
+// OneHotOperation
+OneHotOperation::OneHotOperation(int32_t num_classes) : num_classes_(num_classes) {}
+
+bool OneHotOperation::ValidateParams() {
+  if (num_classes_ < 0) {
+    MS_LOG(ERROR) << "OneHot: Number of classes cannot be negative. Number of classes: " << num_classes_;
+    return false;
+  }
+
+  return true;
+}
+
+std::shared_ptr<TensorOp> OneHotOperation::Build() { return std::make_shared<OneHotOp>(num_classes_); }
+
 // PadOperation
 PadOperation::PadOperation(std::vector<int32_t> padding, std::vector<uint8_t> fill_value, BorderType padding_mode)
     : padding_(padding), fill_value_(fill_value), padding_mode_(padding_mode) {}

mindspore/ccsrc/minddata/dataset/include/transforms.h

@@ -51,7 +51,9 @@ class CenterCropOperation;
 class CropOperation;
 class CutOutOperation;
 class DecodeOperation;
+class MixUpBatchOperation;
 class NormalizeOperation;
+class OneHotOperation;
 class PadOperation;
 class RandomColorAdjustOperation;
 class RandomCropOperation;
@@ -90,6 +92,13 @@ std::shared_ptr<CutOutOperation> CutOut(int32_t length, int32_t num_patches = 1)
 /// \return Shared pointer to the current TensorOperation.
 std::shared_ptr<DecodeOperation> Decode(bool rgb = true);
 
+/// \brief Function to create a MixUpBatch TensorOperation.
+/// \notes Apply MixUp transformation on an input batch of images and labels. The labels must be in one-hot format and
+///    Batch must be called before calling this function.
+/// \param[in] alpha hyperparameter of beta distribution (default = 1.0)
+/// \return Shared pointer to the current TensorOperation.
+std::shared_ptr<MixUpBatchOperation> MixUpBatch(float alpha = 1);
+
 /// \brief Function to create a Normalize TensorOperation.
 /// \notes Normalize the input image with respect to mean and standard deviation.
 /// \param[in] mean - a vector of mean values for each channel, w.r.t channel order.
@@ -97,6 +106,12 @@ std::shared_ptr<DecodeOperation> Decode(bool rgb = true);
 /// \return Shared pointer to the current TensorOperation.
 std::shared_ptr<NormalizeOperation> Normalize(std::vector<float> mean, std::vector<float> std);
 
+/// \brief Function to create a OneHot TensorOperation.
+/// \notes Convert the labels into OneHot format.
+/// \param[in] num_classes number of classes.
+/// \return Shared pointer to the current TensorOperation.
+std::shared_ptr<OneHotOperation> OneHot(int32_t num_classes);
+
 /// \brief Function to create a Pad TensorOp
 /// \notes Pads the image according to padding parameters
 /// \param[in] padding A vector representing the number of pixels to pad the image
@@ -258,6 +273,20 @@ class DecodeOperation : public TensorOperation {
   bool rgb_;
 };
 
+class MixUpBatchOperation : public TensorOperation {
+ public:
+  explicit MixUpBatchOperation(float alpha = 1);
+
+  ~MixUpBatchOperation() = default;
+
+  std::shared_ptr<TensorOp> Build() override;
+
+  bool ValidateParams() override;
+
+ private:
+  float alpha_;
+};
+
 class NormalizeOperation : public TensorOperation {
  public:
   NormalizeOperation(std::vector<float> mean, std::vector<float> std);
@@ -273,6 +302,20 @@ class NormalizeOperation : public TensorOperation {
   std::vector<float> std_;
 };
 
+class OneHotOperation : public TensorOperation {
+ public:
+  explicit OneHotOperation(int32_t num_classes_);
+
+  ~OneHotOperation() = default;
+
+  std::shared_ptr<TensorOp> Build() override;
+
+  bool ValidateParams() override;
+
+ private:
+  float num_classes_;
+};
+
 class PadOperation : public TensorOperation {
  public:
   PadOperation(std::vector<int32_t> padding, std::vector<uint8_t> fill_value = {0},

mindspore/ccsrc/minddata/dataset/kernels/data/data_utils.cc

@@ -20,6 +20,7 @@
 #include <limits>
 #include <string>
 #include <vector>
+#include <utility>
 
 #include "minddata/dataset/core/constants.h"
 #include "minddata/dataset/core/data_type.h"
@@ -648,5 +649,30 @@ Status Concatenate(const TensorRow &input, TensorRow *output, int8_t axis, std::
   return Status::OK();
 }
 
+Status BatchTensorToCVTensorVector(const std::shared_ptr<Tensor> &input,
+                                   std::vector<std::shared_ptr<CVTensor>> *output) {
+  std::vector<int64_t> tensor_shape = input->shape().AsVector();
+  TensorShape remaining({-1});
+  std::vector<int64_t> index(tensor_shape.size(), 0);
+  if (tensor_shape.size() <= 1) {
+    RETURN_STATUS_UNEXPECTED("Tensor must be at least 2-D in order to unpack");
+  }
+  TensorShape element_shape(std::vector<int64_t>(tensor_shape.begin() + 1, tensor_shape.end()));
+
+  for (; index[0] < tensor_shape[0]; index[0]++) {
+    uchar *start_addr_of_index = nullptr;
+    std::shared_ptr<Tensor> out;
+
+    RETURN_IF_NOT_OK(input->StartAddrOfIndex(index, &start_addr_of_index, &remaining));
+    RETURN_IF_NOT_OK(input->CreateFromMemory(element_shape, input->type(), start_addr_of_index, &out));
+    std::shared_ptr<CVTensor> cv_out = CVTensor::AsCVTensor(std::move(out));
+    if (!cv_out->mat().data) {
+      RETURN_STATUS_UNEXPECTED("Could not convert to CV Tensor");
+    }
+    output->push_back(cv_out);
+  }
+  return Status::OK();
+}
+
 }  // namespace dataset
 }  // namespace mindspore

mindspore/ccsrc/minddata/dataset/kernels/data/data_utils.h

@@ -152,6 +152,17 @@ Status Mask(const std::shared_ptr<Tensor> &input, std::shared_ptr<Tensor> *outpu
 
 Status Concatenate(const TensorRow &input, TensorRow *output, int8_t axis, std::shared_ptr<Tensor> prepend,
                    std::shared_ptr<Tensor> append);
+
+// helper for concat, always append to the input, and pass that to the output
+Status ConcatenateHelper(const std::shared_ptr<Tensor> &input, std::shared_ptr<Tensor> *output, int8_t axis,
+                         std::shared_ptr<Tensor> append);
+
+/// Convert an n-dimensional Tensor to a vector of (n-1)-dimensional CVTensors
+/// @param input[in] input tensor
+/// @param output[out] output tensor
+/// @return Status ok/error
+Status BatchTensorToCVTensorVector(const std::shared_ptr<Tensor> &input,
+                                   std::vector<std::shared_ptr<CVTensor>> *output);
 }  // namespace dataset
 }  // namespace mindspore
 

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

@@ -10,6 +10,7 @@ add_library(kernels-image OBJECT
     hwc_to_chw_op.cc
     image_utils.cc
     invert_op.cc
+    mixup_batch_op.cc
     normalize_op.cc
     pad_op.cc
     random_color_adjust_op.cc

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

+/**
+ * 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 <string>
+#include <utility>
+#include "minddata/dataset/core/cv_tensor.h"
+#include "minddata/dataset/kernels/image/mixup_batch_op.h"
+#include "minddata/dataset/kernels/data/data_utils.h"
+#include "minddata/dataset/util/random.h"
+#include "minddata/dataset/util/status.h"
+
+namespace mindspore {
+namespace dataset {
+
+MixUpBatchOp::MixUpBatchOp(float alpha) : alpha_(alpha) { rnd_.seed(GetSeed()); }
+
+Status MixUpBatchOp::Compute(const TensorRow &input, TensorRow *output) {
+  if (input.size() < 2) {
+    RETURN_STATUS_UNEXPECTED("Both images and labels columns are required for this operation");
+  }
+
+  std::vector<std::shared_ptr<CVTensor>> images;
+  std::vector<int64_t> image_shape = input.at(0)->shape().AsVector();
+  std::vector<int64_t> label_shape = input.at(1)->shape().AsVector();
+
+  // Check inputs
+  if (label_shape.size() != 2 || image_shape.size() != 4 || image_shape[0] != label_shape[0]) {
+    RETURN_STATUS_UNEXPECTED("You must batch before calling MixUpBatch");
+  }
+
+  if ((image_shape[1] != 1 && image_shape[1] != 3) && (image_shape[3] != 1 && image_shape[3] != 3)) {
+    RETURN_STATUS_UNEXPECTED("MixUpBatch: Images must be in the shape of HWC or CHW");
+  }
+
+  // Move images into a vector of CVTensors
+  RETURN_IF_NOT_OK(BatchTensorToCVTensorVector(input.at(0), &images));
+
+  // Calculating lambda
+  // If x1 is a random variable from Gamma(a1, 1) and x2 is a random variable from Gamma(a2, 1)
+  // then x = x1 / (x1+x2) is a random variable from Beta(a1, a2)
+  std::gamma_distribution<float> distribution(alpha_, 1);
+  float x1 = distribution(rnd_);
+  float x2 = distribution(rnd_);
+  float lam = x1 / (x1 + x2);
+
+  // Calculate random labels
+  std::vector<int64_t> rand_indx;
+  for (int64_t i = 0; i < images.size(); i++) rand_indx.push_back(i);
+  std::shuffle(rand_indx.begin(), rand_indx.end(), rnd_);
+
+  // Compute labels
+  std::shared_ptr<Tensor> out_labels;
+  RETURN_IF_NOT_OK(TypeCast(std::move(input.at(1)), &out_labels, DataType("float32")));
+  for (int64_t i = 0; i < label_shape[0]; i++) {
+    for (int64_t j = 0; j < label_shape[1]; j++) {
+      uint64_t first_value, second_value;
+      RETURN_IF_NOT_OK(input.at(1)->GetItemAt(&first_value, {i, j}));
+      RETURN_IF_NOT_OK(input.at(1)->GetItemAt(&second_value, {rand_indx[i], j}));
+      RETURN_IF_NOT_OK(out_labels->SetItemAt({i, j}, lam * first_value + (1 - lam) * second_value));
+    }
+  }
+
+  // Compute images
+  for (int64_t i = 0; i < images.size(); i++) {
+    TensorShape remaining({-1});
+    uchar *start_addr_of_index = nullptr;
+    std::shared_ptr<Tensor> out;
+    RETURN_IF_NOT_OK(input.at(0)->StartAddrOfIndex({rand_indx[i], 0, 0, 0}, &start_addr_of_index, &remaining));
+    RETURN_IF_NOT_OK(input.at(0)->CreateFromMemory(TensorShape({image_shape[1], image_shape[2], image_shape[3]}),
+                                                   input.at(0)->type(), start_addr_of_index, &out));
+    std::shared_ptr<CVTensor> rand_image = CVTensor::AsCVTensor(std::move(out));
+    if (!rand_image->mat().data) {
+      RETURN_STATUS_UNEXPECTED("Could not convert to CV Tensor");
+    }
+    images[i]->mat() = lam * images[i]->mat() + (1 - lam) * rand_image->mat();
+  }
+
+  // Move the output into a TensorRow
+  std::shared_ptr<Tensor> output_image;
+  RETURN_IF_NOT_OK(Tensor::CreateEmpty(input.at(0)->shape(), input.at(0)->type(), &output_image));
+  for (int64_t i = 0; i < images.size(); i++) {
+    RETURN_IF_NOT_OK(output_image->InsertTensor({i}, images[i]));
+  }
+  output->push_back(output_image);
+  output->push_back(out_labels);
+
+  return Status::OK();
+}
+
+void MixUpBatchOp::Print(std::ostream &out) const {
+  out << "MixUpBatchOp: "
+      << "alpha: " << alpha_ << "\n";
+}
+}  // namespace dataset
+}  // namespace mindspore

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

+/**
+ * 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 MINDSPORE_CCSRC_MINDDATA_DATASET_KERNELS_IMAGE_MIXUPBATCH_OP_H_
+#define MINDSPORE_CCSRC_MINDDATA_DATASET_KERNELS_IMAGE_MIXUPBATCH_OP_H_
+
+#include <memory>
+#include <vector>
+#include <random>
+#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 MixUpBatchOp : public TensorOp {
+ public:
+  // Default values, also used by python_bindings.cc
+
+  explicit MixUpBatchOp(float alpha);
+
+  ~MixUpBatchOp() override = default;
+
+  void Print(std::ostream &out) const override;
+
+  Status Compute(const TensorRow &input, TensorRow *output) override;
+
+  std::string Name() const override { return kMixUpBatchOp; }
+
+ private:
+  float alpha_;
+  std::mt19937 rnd_;
+};
+}  // namespace dataset
+}  // namespace mindspore
+
+#endif  // MINDSPORE_CCSRC_MINDDATA_DATASET_KERNELS_IMAGE_MIXUPBATCH_OP_H_

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

@@ -99,6 +99,7 @@ constexpr char kCropOp[] = "CropOp";
 constexpr char kEqualizeOp[] = "EqualizeOp";
 constexpr char kHwcToChwOp[] = "HwcToChwOp";
 constexpr char kInvertOp[] = "InvertOp";
+constexpr char kMixUpBatchOp[] = "MixUpBatchOp";
 constexpr char kNormalizeOp[] = "NormalizeOp";
 constexpr char kPadOp[] = "PadOp";
 constexpr char kRandomColorAdjustOp[] = "RandomColorAdjustOp";

mindspore/dataset/transforms/vision/c_transforms.py

@@ -45,9 +45,9 @@ import mindspore._c_dataengine as cde
 
 from .utils import Inter, Border
 from .validators import check_prob, check_crop, check_resize_interpolation, check_random_resize_crop, \
-    check_normalize_c, check_random_crop, check_random_color_adjust, check_random_rotation, check_range, \
-    check_resize, check_rescale, check_pad, check_cutout, check_uniform_augment_cpp, check_bounding_box_augment_cpp, \
-    check_random_select_subpolicy_op, check_auto_contrast, FLOAT_MAX_INTEGER
+    check_mix_up_batch_c, check_normalize_c, check_random_crop, check_random_color_adjust, check_random_rotation, \
+    check_range, check_resize, check_rescale, check_pad, check_cutout, check_uniform_augment_cpp, \
+    check_bounding_box_augment_cpp, check_random_select_subpolicy_op, check_auto_contrast, FLOAT_MAX_INTEGER
 
 DE_C_INTER_MODE = {Inter.NEAREST: cde.InterpolationMode.DE_INTER_NEAREST_NEIGHBOUR,
                    Inter.LINEAR: cde.InterpolationMode.DE_INTER_LINEAR,
@@ -130,6 +130,30 @@ class CutOut(cde.CutOutOp):
         super().__init__(length, length, num_patches, False, *fill_value)
 
 
+class MixUpBatch(cde.MixUpBatchOp):
+    """
+    Apply MixUp transformation on input batch of images and labels. Each image is multiplied by a random weight (lambda)
+    and then added to a randomly selected image from the batch multiplied by (1 - lambda). Same formula is also applied
+    to the one-hot labels.
+    Note that you need to make labels into one-hot format and batch before calling this function.
+
+    Args:
+        alpha (float): hyperparameter of beta distribution (default = 1.0).
+
+    Examples:
+        >>> one_hot_op = data.OneHot(num_classes=10)
+        >>> data = data.map(input_columns=["label"], operations=one_hot_op)
+        >>> mixup_batch_op = vision.MixUpBatch()
+        >>> data = data.batch(5)
+        >>> data = data.map(input_columns=["image", "label"], operations=mixup_batch_op)
+    """
+
+    @check_mix_up_batch_c
+    def __init__(self, alpha=1.0):
+        self.alpha = alpha
+        super().__init__(alpha)
+
+
 class Normalize(cde.NormalizeOp):
     """
     Normalize the input image with respect to mean and standard deviation.

mindspore/dataset/transforms/vision/validators.py

@@ -47,6 +47,19 @@ def check_resize_size(size):
         raise TypeError("Size should be a single integer or a list/tuple (h, w) of length 2.")
 
 
+def check_mix_up_batch_c(method):
+    """Wrapper method to check the parameters of MixUpBatch."""
+
+    @wraps(method)
+    def new_method(self, *args, **kwargs):
+        [alpha], _ = parse_user_args(method, *args, **kwargs)
+        check_pos_float32(alpha)
+
+        return method(self, *args, **kwargs)
+
+    return new_method
+
+
 def check_normalize_c_param(mean, std):
     if len(mean) != len(std):
         raise ValueError("Length of mean and std must be equal")

tests/ut/cpp/dataset/CMakeLists.txt

@@ -27,6 +27,7 @@ SET(DE_UT_SRCS
         main_test.cc
         map_op_test.cc
         mind_record_op_test.cc
+        mixup_batch_op_test.cc
         memory_pool_test.cc
         normalize_op_test.cc
         one_hot_op_test.cc

tests/ut/cpp/dataset/c_api_transforms_test.cc

@@ -146,6 +146,127 @@ TEST_F(MindDataTestPipeline, TestRandomFlip) {
   iter->Stop();
 }
 
+TEST_F(MindDataTestPipeline, TestMixUpBatchSuccess1) {
+  // Create a Cifar10 Dataset
+  std::string folder_path = datasets_root_path_ + "/testCifar10Data/";
+  std::shared_ptr<Dataset> ds = Cifar10(folder_path, RandomSampler(false, 10));
+  EXPECT_NE(ds, nullptr);
+
+  // Create a Batch operation on ds
+  int32_t batch_size = 5;
+  ds = ds->Batch(batch_size);
+  EXPECT_NE(ds, nullptr);
+
+  // Create objects for the tensor ops
+  std::shared_ptr<TensorOperation> one_hot_op = vision::OneHot(10);
+  EXPECT_NE(one_hot_op, nullptr);
+
+  // Create a Map operation on ds
+  ds = ds->Map({one_hot_op},{"label"});
+  EXPECT_NE(ds, nullptr);
+
+  std::shared_ptr<TensorOperation> mixup_batch_op = vision::MixUpBatch(0.5);
+  EXPECT_NE(mixup_batch_op, nullptr);
+
+  // Create a Map operation on ds
+  ds = ds->Map({mixup_batch_op}, {"image", "label"});
+  EXPECT_NE(ds, nullptr);
+
+  // Create an iterator over the result of the above dataset
+  // This will trigger the creation of the Execution Tree and launch it.
+  std::shared_ptr<Iterator> iter = ds->CreateIterator();
+  EXPECT_NE(iter, nullptr);
+
+  // Iterate the dataset and get each row
+  std::unordered_map<std::string, std::shared_ptr<Tensor>> row;
+  iter->GetNextRow(&row);
+
+  uint64_t i = 0;
+  while (row.size() != 0) {
+    i++;
+    auto image = row["image"];
+    MS_LOG(INFO) << "Tensor image shape: " << image->shape();
+    iter->GetNextRow(&row);
+  }
+
+  EXPECT_EQ(i, 2);
+
+  // Manually terminate the pipeline
+  iter->Stop();
+}
+
+TEST_F(MindDataTestPipeline, TestMixUpBatchSuccess2) {
+  // Create a Cifar10 Dataset
+  std::string folder_path = datasets_root_path_ + "/testCifar10Data/";
+  std::shared_ptr<Dataset> ds = Cifar10(folder_path, RandomSampler(false, 10));
+  EXPECT_NE(ds, nullptr);
+
+  // Create a Batch operation on ds
+  int32_t batch_size = 5;
+  ds = ds->Batch(batch_size);
+  EXPECT_NE(ds, nullptr);
+
+  // Create objects for the tensor ops
+  std::shared_ptr<TensorOperation> one_hot_op = vision::OneHot(10);
+  EXPECT_NE(one_hot_op, nullptr);
+
+  // Create a Map operation on ds
+  ds = ds->Map({one_hot_op},{"label"});
+  EXPECT_NE(ds, nullptr);
+
+  std::shared_ptr<TensorOperation> mixup_batch_op = vision::MixUpBatch();
+  EXPECT_NE(mixup_batch_op, nullptr);
+
+  // Create a Map operation on ds
+  ds = ds->Map({mixup_batch_op}, {"image", "label"});
+  EXPECT_NE(ds, nullptr);
+
+  // Create an iterator over the result of the above dataset
+  // This will trigger the creation of the Execution Tree and launch it.
+  std::shared_ptr<Iterator> iter = ds->CreateIterator();
+  EXPECT_NE(iter, nullptr);
+
+  // Iterate the dataset and get each row
+  std::unordered_map<std::string, std::shared_ptr<Tensor>> row;
+  iter->GetNextRow(&row);
+
+  uint64_t i = 0;
+  while (row.size() != 0) {
+    i++;
+    auto image = row["image"];
+    MS_LOG(INFO) << "Tensor image shape: " << image->shape();
+    iter->GetNextRow(&row);
+  }
+
+  EXPECT_EQ(i, 2);
+
+  // Manually terminate the pipeline
+  iter->Stop();
+}
+
+TEST_F(MindDataTestPipeline, TestMixUpBatchFail1) {
+  // Create a Cifar10 Dataset
+  std::string folder_path = datasets_root_path_ + "/testCifar10Data/";
+  std::shared_ptr<Dataset> ds = Cifar10(folder_path, RandomSampler(false, 10));
+  EXPECT_NE(ds, nullptr);
+
+  // Create a Batch operation on ds
+  int32_t batch_size = 5;
+  ds = ds->Batch(batch_size);
+  EXPECT_NE(ds, nullptr);
+
+  // Create objects for the tensor ops
+  std::shared_ptr<TensorOperation> one_hot_op = vision::OneHot(10);
+  EXPECT_NE(one_hot_op, nullptr);
+
+  // Create a Map operation on ds
+  ds = ds->Map({one_hot_op},{"label"});
+  EXPECT_NE(ds, nullptr);
+
+  std::shared_ptr<TensorOperation> mixup_batch_op = vision::MixUpBatch(-1);
+  EXPECT_EQ(mixup_batch_op, nullptr);
+}
+
 TEST_F(MindDataTestPipeline, TestPad) {
   // Create an ImageFolder Dataset
   std::string folder_path = datasets_root_path_ + "/testPK/data/";

tests/ut/cpp/dataset/mixup_batch_op_test.cc

+/**
+ * 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 "common/common.h"
+#include "common/cvop_common.h"
+#include "minddata/dataset/kernels/image/mixup_batch_op.h"
+#include "utils/log_adapter.h"
+
+using namespace mindspore::dataset;
+using mindspore::MsLogLevel::INFO;
+using mindspore::ExceptionType::NoExceptionType;
+using mindspore::LogStream;
+
+class MindDataTestMixUpBatchOp : public UT::CVOP::CVOpCommon {
+ protected:
+  MindDataTestMixUpBatchOp() : CVOpCommon() {}
+
+  std::shared_ptr<Tensor> output_tensor_;
+};
+
+TEST_F(MindDataTestMixUpBatchOp, TestSuccess) {
+  MS_LOG(INFO) << "Doing MindDataTestMixUpBatchOp success case";
+  std::shared_ptr<Tensor> batched_tensor;
+  std::shared_ptr<Tensor> batched_labels;
+  Tensor::CreateEmpty(TensorShape({2, input_tensor_->shape()[0], input_tensor_->shape()[1], input_tensor_->shape()[2]}), input_tensor_->type(), &batched_tensor);
+  for (int i = 0; i < 2; i++) {
+  batched_tensor->InsertTensor({i}, input_tensor_);
+  }
+  Tensor::CreateFromVector(std::vector<uint32_t>({0, 1, 1, 0}), TensorShape({2, 2}), &batched_labels);
+  std::shared_ptr<MixUpBatchOp> op = std::make_shared<MixUpBatchOp>(1);
+  TensorRow in;
+  in.push_back(batched_tensor);
+  in.push_back(batched_labels);
+  TensorRow out;
+  ASSERT_TRUE(op->Compute(in, &out).IsOk());
+
+  EXPECT_EQ(in.at(0)->shape()[0], out.at(0)->shape()[0]);
+  EXPECT_EQ(in.at(0)->shape()[1], out.at(0)->shape()[1]);
+  EXPECT_EQ(in.at(0)->shape()[2], out.at(0)->shape()[2]);
+  EXPECT_EQ(in.at(0)->shape()[3], out.at(0)->shape()[3]);
+
+  EXPECT_EQ(in.at(1)->shape()[0], out.at(1)->shape()[0]);
+  EXPECT_EQ(in.at(1)->shape()[1], out.at(1)->shape()[1]);
+}
+
+TEST_F(MindDataTestMixUpBatchOp, TestFail) {
+  // This is a fail case because our labels are not batched and are 1-dimensional
+  MS_LOG(INFO) << "Doing MindDataTestMixUpBatchOp fail case";
+  std::shared_ptr<Tensor> labels;
+  Tensor::CreateFromVector(std::vector<uint32_t>({0, 1, 1, 0}), TensorShape({4}), &labels);
+  std::shared_ptr<MixUpBatchOp> op = std::make_shared<MixUpBatchOp>(1);
+  TensorRow in;
+  in.push_back(input_tensor_);
+  in.push_back(labels);
+  TensorRow out;
+  ASSERT_FALSE(op->Compute(in, &out).IsOk());
+}

tests/ut/python/dataset/test_mixup_op.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.
+# ==============================================================================
+"""
+Testing the MixUpBatch op in DE
+"""
+import numpy as np
+import pytest
+import mindspore.dataset as ds
+import mindspore.dataset.transforms.vision.c_transforms as vision
+import mindspore.dataset.transforms.c_transforms as data_trans
+from mindspore import log as logger
+from util import save_and_check_md5, diff_mse, visualize_list, config_get_set_seed, \
+    config_get_set_num_parallel_workers
+
+DATA_DIR = "../data/dataset/testCifar10Data"
+
+GENERATE_GOLDEN = False
+
+def test_mixup_batch_success1(plot=False):
+    """
+    Test MixUpBatch op with specified alpha parameter
+    """
+    logger.info("test_mixup_batch_success1")
+
+    # Original Images
+    ds_original = ds.Cifar10Dataset(DATA_DIR, num_samples=10, shuffle=False)
+    ds_original = ds_original.batch(5, drop_remainder=True)
+
+    images_original = None
+    for idx, (image, _) in enumerate(ds_original):
+        if idx == 0:
+            images_original = image
+        else:
+            images_original = np.append(images_original, image, axis=0)
+
+    # MixUp Images
+    data1 = ds.Cifar10Dataset(DATA_DIR, num_samples=10, shuffle=False)
+
+    one_hot_op = data_trans.OneHot(num_classes=10)
+    data1 = data1.map(input_columns=["label"], operations=one_hot_op)
+    mixup_batch_op = vision.MixUpBatch(2)
+    data1 = data1.batch(5, drop_remainder=True)
+    data1 = data1.map(input_columns=["image", "label"], operations=mixup_batch_op)
+
+    images_mixup = None
+    for idx, (image, _) in enumerate(data1):
+        if idx == 0:
+            images_mixup = image
+        else:
+            images_mixup = np.append(images_mixup, image, axis=0)
+    if plot:
+        visualize_list(images_original, images_mixup)
+
+    num_samples = images_original.shape[0]
+    mse = np.zeros(num_samples)
+    for i in range(num_samples):
+        mse[i] = diff_mse(images_mixup[i], images_original[i])
+    logger.info("MSE= {}".format(str(np.mean(mse))))
+
+
+def test_mixup_batch_success2(plot=False):
+    """
+    Test MixUpBatch op without specified alpha parameter.
+    Alpha parameter will be selected by default in this case
+    """
+    logger.info("test_mixup_batch_success2")
+
+    # Original Images
+    ds_original = ds.Cifar10Dataset(DATA_DIR, num_samples=10, shuffle=False)
+    ds_original = ds_original.batch(5, drop_remainder=True)
+
+    images_original = None
+    for idx, (image, _) in enumerate(ds_original):
+        if idx == 0:
+            images_original = image
+        else:
+            images_original = np.append(images_original, image, axis=0)
+
+    # MixUp Images
+    data1 = ds.Cifar10Dataset(DATA_DIR, num_samples=10, shuffle=False)
+
+    one_hot_op = data_trans.OneHot(num_classes=10)
+    data1 = data1.map(input_columns=["label"], operations=one_hot_op)
+    mixup_batch_op = vision.MixUpBatch()
+    data1 = data1.batch(5, drop_remainder=True)
+    data1 = data1.map(input_columns=["image", "label"], operations=mixup_batch_op)
+
+    images_mixup = np.array([])
+    for idx, (image, _) in enumerate(data1):
+        if idx == 0:
+            images_mixup = image
+        else:
+            images_mixup = np.append(images_mixup, image, axis=0)
+    if plot:
+        visualize_list(images_original, images_mixup)
+
+    num_samples = images_original.shape[0]
+    mse = np.zeros(num_samples)
+    for i in range(num_samples):
+        mse[i] = diff_mse(images_mixup[i], images_original[i])
+    logger.info("MSE= {}".format(str(np.mean(mse))))
+
+
+def test_mixup_batch_md5():
+    """
+    Test MixUpBatch with MD5:
+    """
+    logger.info("test_mixup_batch_md5")
+    original_seed = config_get_set_seed(0)
+    original_num_parallel_workers = config_get_set_num_parallel_workers(1)
+
+    # MixUp Images
+    data = ds.Cifar10Dataset(DATA_DIR, num_samples=10, shuffle=False)
+
+    one_hot_op = data_trans.OneHot(num_classes=10)
+    data = data.map(input_columns=["label"], operations=one_hot_op)
+    mixup_batch_op = vision.MixUpBatch()
+    data = data.batch(5, drop_remainder=True)
+    data = data.map(input_columns=["image", "label"], operations=mixup_batch_op)
+
+    filename = "mixup_batch_c_result.npz"
+    save_and_check_md5(data, filename, generate_golden=GENERATE_GOLDEN)
+
+    # Restore config setting
+    ds.config.set_seed(original_seed)
+    ds.config.set_num_parallel_workers(original_num_parallel_workers)
+
+
+def test_mixup_batch_fail1():
+    """
+    Test MixUpBatch Fail 1
+    We expect this to fail because the images and labels are not batched
+    """
+    logger.info("test_mixup_batch_fail1")
+
+    # Original Images
+    ds_original = ds.Cifar10Dataset(DATA_DIR, num_samples=10, shuffle=False)
+    ds_original = ds_original.batch(5)
+
+    images_original = np.array([])
+    for idx, (image, _) in enumerate(ds_original):
+        if idx == 0:
+            images_original = image
+        else:
+            images_original = np.append(images_original, image, axis=0)
+
+    # MixUp Images
+    data1 = ds.Cifar10Dataset(DATA_DIR, num_samples=10, shuffle=False)
+
+    one_hot_op = data_trans.OneHot(num_classes=10)
+    data1 = data1.map(input_columns=["label"], operations=one_hot_op)
+    mixup_batch_op = vision.MixUpBatch(0.1)
+    with pytest.raises(RuntimeError) as error:
+        data1 = data1.map(input_columns=["image", "label"], operations=mixup_batch_op)
+        for idx, (image, _) in enumerate(data1):
+            if idx == 0:
+                images_mixup = image
+            else:
+                images_mixup = np.append(images_mixup, image, axis=0)
+        error_message = "You must batch before calling MixUp"
+        assert error_message in str(error.value)
+
+
+def test_mixup_batch_fail2():
+    """
+    Test MixUpBatch Fail 2
+    We expect this to fail because alpha is negative
+    """
+    logger.info("test_mixup_batch_fail2")
+
+    # Original Images
+    ds_original = ds.Cifar10Dataset(DATA_DIR, num_samples=10, shuffle=False)
+    ds_original = ds_original.batch(5)
+
+    images_original = np.array([])
+    for idx, (image, _) in enumerate(ds_original):
+        if idx == 0:
+            images_original = image
+        else:
+            images_original = np.append(images_original, image, axis=0)
+
+    # MixUp Images
+    data1 = ds.Cifar10Dataset(DATA_DIR, num_samples=10, shuffle=False)
+
+    one_hot_op = data_trans.OneHot(num_classes=10)
+    data1 = data1.map(input_columns=["label"], operations=one_hot_op)
+    with pytest.raises(ValueError) as error:
+        vision.MixUpBatch(-1)
+        error_message = "Input is not within the required interval"
+        assert error_message in str(error.value)
+
+
+def test_mixup_batch_fail3():
+    """
+    Test MixUpBatch op
+    We expect this to fail because label column is not passed to mixup_batch
+    """
+    # Original Images
+    ds_original = ds.Cifar10Dataset(DATA_DIR, num_samples=10, shuffle=False)
+    ds_original = ds_original.batch(5, drop_remainder=True)
+
+    images_original = None
+    for idx, (image, _) in enumerate(ds_original):
+        if idx == 0:
+            images_original = image
+        else:
+            images_original = np.append(images_original, image, axis=0)
+
+    # MixUp Images
+    data1 = ds.Cifar10Dataset(DATA_DIR, num_samples=10, shuffle=False)
+
+    one_hot_op = data_trans.OneHot(num_classes=10)
+    data1 = data1.map(input_columns=["label"], operations=one_hot_op)
+    mixup_batch_op = vision.MixUpBatch()
+    data1 = data1.batch(5, drop_remainder=True)
+    data1 = data1.map(input_columns=["image"], operations=mixup_batch_op)
+
+    with pytest.raises(RuntimeError) as error:
+        images_mixup = np.array([])
+        for idx, (image, _) in enumerate(data1):
+            if idx == 0:
+                images_mixup = image
+            else:
+                images_mixup = np.append(images_mixup, image, axis=0)
+    error_message = "Both images and labels columns are required"
+    assert error_message in str(error.value)
+
+
+if __name__ == "__main__":
+    test_mixup_batch_success1(plot=True)
+    test_mixup_batch_success2(plot=True)
+    test_mixup_batch_md5()
+    test_mixup_batch_fail1()
+    test_mixup_batch_fail2()
+    test_mixup_batch_fail3()