add GPU UniformSampler

mindspore/ccsrc/backend/kernel_compiler/gpu/cuda_impl/uniform_sampler_impl.cu

@@ -0,0 +1,36 @@
+/**
+ * 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 "backend/kernel_compiler/gpu/cuda_impl/uniform_sampler_impl.cuh"
+
+template <typename S>
+__global__ void AssignToOutput(const int size, const S prob_val, S *output_array) {
+  for (size_t pos = blockIdx.x * blockDim.x + threadIdx.x; pos < size; pos += blockDim.x * gridDim.x) {
+    output_array[pos] = prob_val;
+  }
+}
+
+template <typename S>
+void CalUniformSampler(const int true_size, const int num_sampled, const S prob_val, S *true_expected_count,
+                       S *sampled_expected_count, cudaStream_t cuda_stream) {
+  AssignToOutput<<<GET_BLOCKS(true_size), GET_THREADS, 0, cuda_stream>>>(true_size, prob_val, true_expected_count);
+  AssignToOutput<<<GET_BLOCKS(num_sampled), GET_THREADS, 0, cuda_stream>>>(num_sampled, prob_val,
+                                                                           sampled_expected_count);
+}
+
+template void CalUniformSampler<float>(const int true_size, const int num_sampled, const float prob_val,
+                                       float *true_expected_count, float *sampled_expected_count,
+                                       cudaStream_t cuda_stream);

mindspore/ccsrc/backend/kernel_compiler/gpu/cuda_impl/uniform_sampler_impl.cuh

@@ -0,0 +1,26 @@
+/**
+ * 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_BACKEND_KERNEL_COMPILER_GPU_CUDA_IMPL_UNIFORM_SAMPLER_IMPL_CUH_
+#define MINDSPORE_CCSRC_BACKEND_KERNEL_COMPILER_GPU_CUDA_IMPL_UNIFORM_SAMPLER_IMPL_CUH_
+#include <cuda_runtime.h>
+#include "runtime/device/gpu/cuda_common.h"
+
+template <typename S>
+void CalUniformSampler(const int true_size, const int num_sampled, const S prob_val, S *true_expected_count,
+                       S *sampled_expected_count, cudaStream_t cuda_stream);
+
+#endif  // MINDSPORE_CCSRC_BACKEND_KERNEL_COMPILER_GPU_CUDA_IMPL_UNIFORM_SAMPLER_IMPL_CUH_

mindspore/ccsrc/backend/kernel_compiler/gpu/nn/uniform_sampler_gpu_kernel.cc

@@ -0,0 +1,29 @@
+/**
+ * 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 "backend/kernel_compiler/gpu/nn/uniform_sampler_gpu_kernel.h"
+
+namespace mindspore {
+namespace kernel {
+MS_REG_GPU_KERNEL_TWO(UniformSampler,
+                      KernelAttr()
+                        .AddInputAttr(kNumberTypeInt32)
+                        .AddOutputAttr(kNumberTypeInt32)
+                        .AddOutputAttr(kNumberTypeFloat32)
+                        .AddOutputAttr(kNumberTypeFloat32),
+                      UniformSamplerGpuKernel, int, float)
+}  // namespace kernel
+}  // namespace mindspore

mindspore/ccsrc/backend/kernel_compiler/gpu/nn/uniform_sampler_gpu_kernel.h

@@ -0,0 +1,144 @@
+/**
+ * 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_BACKEND_KERNEL_COMPILER_GPU_NN_UNIFORM_SAMPLER_GPU_KERNEL_H_
+#define MINDSPORE_CCSRC_BACKEND_KERNEL_COMPILER_GPU_NN_UNIFORM_SAMPLER_GPU_KERNEL_H_
+
+#include <cmath>
+#include <set>
+#include <vector>
+#include <random>
+#include "backend/kernel_compiler/gpu/gpu_kernel.h"
+#include "backend/kernel_compiler/gpu/gpu_kernel_factory.h"
+#include "backend/kernel_compiler/gpu/cuda_impl/uniform_sampler_impl.cuh"
+
+namespace mindspore {
+namespace kernel {
+template <typename T, typename S>
+class UniformSamplerGpuKernel : public GpuKernel {
+ public:
+  UniformSamplerGpuKernel() : num_true_(0), num_sampled_(0), unique_(false), range_max_(0), input_size_(0) {}
+  ~UniformSamplerGpuKernel() override = default;
+
+  const std::vector<size_t> &GetInputSizeList() const override { return input_size_list_; }
+  const std::vector<size_t> &GetOutputSizeList() const override { return output_size_list_; }
+  const std::vector<size_t> &GetWorkspaceSizeList() const override { return workspace_size_list_; }
+
+  bool Launch(const std::vector<AddressPtr> &inputs, const std::vector<AddressPtr> &workspaces,
+              const std::vector<AddressPtr> &outputs, void *stream_ptr) override {
+    VARIABLE_NOT_USED(workspaces);
+    T *sampled_candidates = GetDeviceAddress<T>(outputs, 0);
+    S *true_expected_count = GetDeviceAddress<S>(outputs, 1);
+    S *sampled_expected_count = GetDeviceAddress<S>(outputs, 2);
+    int counter = Sampling();
+    float prob = Probability();
+    size_t sampled_candidates_size = num_sampled_ * sizeof(T);
+    S value = ApproximateExpectedCount(prob, num_sampled_, counter);
+    CHECK_CUDA_RET_WITH_EXCEPT(cudaMemcpyAsync(sampled_candidates, &sampled_candidates_[0], sampled_candidates_size,
+                                               cudaMemcpyHostToDevice, reinterpret_cast<cudaStream_t>(stream_ptr)),
+                               "cudaMemcpyAsync sampled_candidates failed");
+    CalUniformSampler(static_cast<int>(input_size_), num_sampled_, value, true_expected_count, sampled_expected_count,
+                      reinterpret_cast<cudaStream_t>(stream_ptr));
+    return true;
+  }
+
+  bool Init(const CNodePtr &kernel_node) override {
+    size_t input_num = AnfAlgo::GetInputTensorNum(kernel_node);
+    if (input_num != 1) {
+      MS_LOG(ERROR) << "Input number is " << input_num << ", but UniformSampler needs 1 input.";
+      return false;
+    }
+    size_t output_num = AnfAlgo::GetOutputTensorNum(kernel_node);
+    if (output_num != 3) {
+      MS_LOG(ERROR) << "Output number is " << output_num << ", but UniformSampler has 3 outputs.";
+      return false;
+    }
+    // getting attrs
+    num_true_ = GetAttr<int>(kernel_node, "num_true");
+    num_sampled_ = GetAttr<int>(kernel_node, "num_sampled");
+    unique_ = GetAttr<bool>(kernel_node, "unique");
+    range_max_ = GetAttr<int>(kernel_node, "range_max");
+    int seed = GetAttr<int>(kernel_node, "seed");
+    if (seed == 0) seed = time(NULL);
+    generator_.seed(seed);
+    auto input_shape = AnfAlgo::GetInputDeviceShape(kernel_node, 0);
+    if (input_shape.size() != 2) {
+      MS_LOG(ERROR) << "Input is " << input_shape.size() << "-D, but UniformSampler supports only 2-D inputs.";
+      return false;
+    }
+    input_size_ = input_shape[0] * input_shape[1];
+    InitSizeLists();
+    return true;
+  }
+
+ protected:
+  void InitSizeLists() override {
+    input_size_list_.push_back(input_size_ * sizeof(T));
+    output_size_list_.push_back(num_sampled_ * sizeof(T));
+    output_size_list_.push_back(input_size_ * sizeof(S));
+    output_size_list_.push_back(num_sampled_ * sizeof(S));
+  }
+
+  int Sampling() {
+    int counter = 0;
+    int tmp;
+    int picked;
+    std::set<int> set_container;
+    // pick between [0, range_max_-1]
+    std::uniform_int_distribution<int> distribution(0, range_max_ - 1);
+    sampled_candidates_.clear();
+    if (unique_) {
+      picked = 0;
+      while (picked < num_sampled_) {
+        tmp = distribution(generator_);
+        counter++;
+        if (set_container.find(tmp) == set_container.end()) {
+          set_container.insert(tmp);
+          sampled_candidates_.push_back(tmp);
+          picked++;
+        }
+      }
+    } else {
+      for (int i = 0; i < num_sampled_; i++) {
+        sampled_candidates_.push_back(distribution(generator_));
+      }
+      counter = num_sampled_;
+    }
+    return counter;
+  }
+
+  S Probability() { return static_cast<S>(1.0f / range_max_); }
+
+  S ApproximateExpectedCount(S p, int sampled_size, int counter) {
+    if (sampled_size == counter) return p * sampled_size;
+    return -std::expm1(counter * std::log1p(-p));
+  }
+
+ private:
+  int num_true_;
+  int num_sampled_;
+  bool unique_;
+  int range_max_;
+  size_t input_size_;
+  std::default_random_engine generator_;
+  std::vector<int> sampled_candidates_;
+  std::vector<size_t> input_size_list_;
+  std::vector<size_t> output_size_list_;
+  std::vector<size_t> workspace_size_list_;
+};
+}  // namespace kernel
+}  // namespace mindspore
+#endif  // MINDSPORE_CCSRC_BACKEND_KERNEL_COMPILER_GPU_NN_UNIFORM_SAMPLER_GPU_KERNEL_H_

mindspore/ops/operations/__init__.py

@@ -79,7 +79,7 @@ from .nn_ops import (LSTM, SGD, Adam, FusedSparseAdam, FusedSparseLazyAdam, Appl
                      FusedSparseFtrl, FusedSparseProximalAdagrad,
                      ApplyAdaMax, ApplyAdadelta, ApplyAdagrad, ApplyAdagradV2,
                      ApplyAddSign, ApplyPowerSign, ApplyGradientDescent, ApplyProximalGradientDescent,
-                     ApplyRMSProp, ApplyCenteredRMSProp, BasicLSTMCell, InTopK)
+                     ApplyRMSProp, ApplyCenteredRMSProp, BasicLSTMCell, InTopK, UniformSampler)
 from . import _quant_ops
 from ._quant_ops import *
 from .other_ops import (Assign, IOU, BoundingBoxDecode, BoundingBoxEncode, PopulationCount,
@@ -373,6 +373,7 @@ __all__ = [
     "ApproximateEqual",
     "InplaceUpdate",
     "InTopK",
+    "UniformSampler",
     "LRN",
     "Mod",
     "PopulationCount",

mindspore/ops/operations/nn_ops.py

@@ -5730,3 +5730,56 @@ class LRN(PrimitiveWithInfer):
     def infer_shape(self, x_shape):
         validator.check_integer("x_shape", len(x_shape), 4, Rel.EQ, self.name)
         return x_shape
+
+
+class UniformSampler(PrimitiveWithInfer):
+    r"""
+    Uniform candidate sampler.
+
+    This function samples a set of classes(sampled_candidates) from [0, range_max-1] based on uniform distribution.
+    If unique=True, candidates are drawn without replacement, else unique=False with replacement.
+
+    Args:
+        num_true (int): The number of target classes in each training example.
+        num_sampled (int): The number of classes to randomly sample. The **sampled_candidates** will have a shape
+        of num_sampled. If unique=True, num_sampled must be less than or equal to range_max.
+        unique (bool): Whether all sampled classes in a batch are unique.
+        range_max (int): The number of possible classes.
+        seed (int): Random seed, must be non-negative. Default: 0.
+
+    Inputs:
+        true_classes (int): A tensor. The target classes with a tensor shape of (batch_size, num_true).
+
+    Outputs:
+        A tuple of 3 tensors.
+        sampled_candidates: (int): The sampled_candidates is independent of the true classes. Shape: (num_sampled, ).
+        true_expected_count: (float): The expected counts under the sampling distribution of each of true_classes.
+        Shape: (batch_size, num_true).
+        sampled_expected_count: (float): The expected counts under the sampling distribution of each of
+        sampled_candidates. Shape: (num_sampled, ).
+
+    Examples:
+        >>> sampler = P.UniformSampler(1, 3, False, 4)
+        >>> SampledCandidates, TrueExpectedCount, SampledExpectedCount = sampler(Tensor(np.array([[1],[3],[4],[6],
+        [3]], dtype=np.int32)))
+        [1, 1, 3], [[0.75], [0.75], [0.75], [0.75], [0.75]], [0.75, 0.75, 0.75]
+    """
+    @prim_attr_register
+    def __init__(self, num_true, num_sampled, unique, range_max, seed=0):
+        """Initialize UniformSampler"""
+        validator.check_value_type("num_true", num_true, [int], self.name)
+        validator.check_value_type("num_sampled", num_sampled, [int], self.name)
+        validator.check_value_type("unique", unique, [bool], self.name)
+        validator.check_value_type("range_max", range_max, [int], self.name)
+        validator.check_value_type("seed", seed, [int], self.name)
+        validator.check("value of num_sampled", num_sampled, '', 0, Rel.GT, self.name)
+        if unique:
+            validator.check('value of num_sampled', num_sampled, "value of range_max", range_max, Rel.LE, self.name)
+        validator.check("value of seed", seed, '', 0, Rel.GE, self.name)
+        self.num_sampled = num_sampled
+
+    def infer_dtype(self, true_classes_type):
+        return (true_classes_type, mstype.float32, mstype.float32)
+
+    def infer_shape(self, true_classes_shape):
+        return ([self.num_sampled], true_classes_shape, [self.num_sampled])

tests/st/ops/gpu/test_uniform_sampler_op.py

@@ -0,0 +1,116 @@
+# 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 pytest
+
+from mindspore import Tensor
+from mindspore.ops import operations as P
+import mindspore.nn as nn
+import mindspore.context as context
+
+class UniformSamplerNet(nn.Cell):
+    def __init__(self, num_true, num_sampled, unique, range_max):
+        super(UniformSamplerNet, self).__init__()
+        self.sampler = P.UniformSampler(num_true, num_sampled, unique, range_max)
+
+    def construct(self, x):
+        return self.sampler(x)
+
+
+def uniform_sampler(x, num_true, num_sampled, unique, range_max):
+    uniform_sampler_net = UniformSamplerNet(num_true, num_sampled, unique, range_max)
+    out1, out2, out3 = uniform_sampler_net(Tensor(x.astype(np.int32)))
+    return out1.shape, out2.shape, out3.shape
+
+@pytest.mark.level0
+@pytest.mark.platform_x86_gpu_training
+@pytest.mark.env_onecard
+def test_uniform_sampler_unique_1_true():
+    context.set_context(mode=context.GRAPH_MODE, device_target="GPU")
+    ms1, ms2, ms3 = uniform_sampler(np.array([[1], [3], [4], [6], [3]]), 1, 3, True, 4)
+    expected_1 = (3,)
+    expected_2 = (5, 1)
+    expected_3 = (3,)
+    np.testing.assert_array_equal(ms1, expected_1)
+    np.testing.assert_array_equal(ms2, expected_2)
+    np.testing.assert_array_equal(ms3, expected_3)
+
+@pytest.mark.level0
+@pytest.mark.platform_x86_gpu_training
+@pytest.mark.env_onecard
+def test_uniform_sampler_not_unique_1_true():
+    context.set_context(mode=context.GRAPH_MODE, device_target="GPU")
+    ms1, ms2, ms3 = uniform_sampler(np.array([[1], [3], [4], [6], [3]]), 1, 3, False, 4)
+    expected_1 = (3,)
+    expected_2 = (5, 1)
+    expected_3 = (3,)
+    np.testing.assert_array_equal(ms1, expected_1)
+    np.testing.assert_array_equal(ms2, expected_2)
+    np.testing.assert_array_equal(ms3, expected_3)
+
+@pytest.mark.level0
+@pytest.mark.platform_x86_gpu_training
+@pytest.mark.env_onecard
+def test_uniform_sampler_unique_2_true():
+    context.set_context(mode=context.GRAPH_MODE, device_target="GPU")
+    ms1, ms2, ms3 = uniform_sampler(np.array([[1, 2], [3, 2], [4, 2], [6, 2], [3, 2]]), 2, 3, True, 4)
+    expected_1 = (3,)
+    expected_2 = (5, 2)
+    expected_3 = (3,)
+    np.testing.assert_array_equal(ms1, expected_1)
+    np.testing.assert_array_equal(ms2, expected_2)
+    np.testing.assert_array_equal(ms3, expected_3)
+
+@pytest.mark.level0
+@pytest.mark.platform_x86_gpu_training
+@pytest.mark.env_onecard
+def test_uniform_sampler_not_unique_2_true():
+    context.set_context(mode=context.GRAPH_MODE, device_target="GPU")
+    ms1, ms2, ms3 = uniform_sampler(np.array([[1, 2], [3, 2], [4, 2], [6, 2], [3, 2]]), 2, 3, False, 4)
+    expected_1 = (3,)
+    expected_2 = (5, 2)
+    expected_3 = (3,)
+    np.testing.assert_array_equal(ms1, expected_1)
+    np.testing.assert_array_equal(ms2, expected_2)
+    np.testing.assert_array_equal(ms3, expected_3)
+
+@pytest.mark.level0
+@pytest.mark.platform_x86_gpu_training
+@pytest.mark.env_onecard
+def test_uniform_sampler_large():
+    context.set_context(mode=context.GRAPH_MODE, device_target="GPU")
+    ms1, ms2, ms3 = uniform_sampler(np.array([[12221, 41414], [3312, 5125152], [3312454, 51252],
+                                              [65125, 225125], [35125, 5125122]]), 2, 5, False, 100)
+    expected_1 = (5,)
+    expected_2 = (5, 2)
+    expected_3 = (5,)
+    np.testing.assert_array_equal(ms1, expected_1)
+    np.testing.assert_array_equal(ms2, expected_2)
+    np.testing.assert_array_equal(ms3, expected_3)
+
+
+@pytest.mark.level0
+@pytest.mark.platform_x86_gpu_training
+@pytest.mark.env_onecard
+def test_uniform_sampler_large_random():
+    context.set_context(mode=context.GRAPH_MODE, device_target="GPU")
+    ms1, ms2, ms3 = uniform_sampler(np.arange(2142).reshape(34, 63), 63, 10, False, 12)
+    expected_1 = (10,)
+    expected_2 = (34, 63)
+    expected_3 = (10,)
+    np.testing.assert_array_equal(ms1, expected_1)
+    np.testing.assert_array_equal(ms2, expected_2)
+    np.testing.assert_array_equal(ms3, expected_3)