[NPU] Add relu6 and relu6_grad npu op (#34596)

* Add relu6 and relu6_grad npu op

* fixed pre-commit-config.yaml

* fixed for CI

paddle/fluid/operators/activation_op_npu.cc

@@ -144,6 +144,47 @@ class ReluGradNPUKernel : public framework::OpKernel<T> {
   }
 };
 
+template <typename DeviceContext, typename T>
+class Relu6NPUKernel : public framework::OpKernel<T> {
+ public:
+  void Compute(const framework::ExecutionContext& ctx) const override {
+    auto* x = ctx.Input<Tensor>("X");
+    auto* out = ctx.Output<Tensor>("Out");
+
+    out->mutable_data<T>(ctx.GetPlace());
+
+    const auto& runner = NpuOpRunner("Relu6",
+                                     {
+                                         *x,
+                                     },
+                                     {*out}, {});
+
+    auto stream =
+        ctx.template device_context<paddle::platform::NPUDeviceContext>()
+            .stream();
+    runner.Run(stream);
+  }
+};
+
+template <typename DeviceContext, typename T>
+class Relu6GradNPUKernel : public framework::OpKernel<T> {
+ public:
+  void Compute(const framework::ExecutionContext& ctx) const override {
+    auto* out = ctx.Input<Tensor>("Out");
+    auto* dout = ctx.Input<Tensor>(framework::GradVarName("Out"));
+    auto* dx = ctx.Output<Tensor>(framework::GradVarName("X"));
+
+    auto stream =
+        ctx.template device_context<paddle::platform::NPUDeviceContext>()
+            .stream();
+
+    dx->mutable_data<T>(ctx.GetPlace());
+    const auto& runner = NpuOpRunner("Relu6Grad", {*dout, *out}, {*dx}, {});
+
+    runner.Run(stream);
+  }
+};
+
 template <typename DeviceContext, typename T>
 class SqrtNPUKernel : public framework::OpKernel<T> {
  public:
@@ -457,6 +498,17 @@ REGISTER_OP_NPU_KERNEL(
     ops::ReluGradNPUKernel<paddle::platform::NPUDeviceContext,
                            paddle::platform::float16>);
 
+REGISTER_OP_NPU_KERNEL(
+    relu6, ops::Relu6NPUKernel<paddle::platform::NPUDeviceContext, float>,
+    ops::Relu6NPUKernel<paddle::platform::NPUDeviceContext,
+                        paddle::platform::float16>);
+
+REGISTER_OP_NPU_KERNEL(
+    relu6_grad,
+    ops::Relu6GradNPUKernel<paddle::platform::NPUDeviceContext, float>,
+    ops::Relu6GradNPUKernel<paddle::platform::NPUDeviceContext,
+                            paddle::platform::float16>);
+
 REGISTER_OP_NPU_KERNEL(
     sqrt, ops::SqrtNPUKernel<paddle::platform::NPUDeviceContext, float>,
     ops::SqrtNPUKernel<paddle::platform::NPUDeviceContext,

python/paddle/fluid/tests/unittests/npu/test_relu6_op_npu.py

+#  Copyright (c) 2021 PaddlePaddle Authors. All Rights Reserved.
+#
+# 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.
+
+from __future__ import print_function
+import paddle.fluid as fluid
+import paddle
+from op_test import OpTest
+
+import numpy as np
+import unittest
+import sys
+sys.path.append("..")
+
+paddle.enable_static()
+SEED = 2021
+
+
+def ref_relu6(x, threshold=6.0):
+    out = np.copy(x)
+    out[np.abs(x - threshold) < 0.005] = threshold + 0.02
+    out = np.minimum(np.maximum(x, 0), threshold)
+    return out
+
+
+class TestRelu6(OpTest):
+    def setUp(self):
+        self.set_npu()
+        self.op_type = "relu6"
+        self.place = paddle.NPUPlace(0)
+
+        self.init_dtype()
+        np.random.seed(SEED)
+        x = np.random.uniform(-1, 10, [10, 12]).astype(self.dtype)
+        x[np.abs(x) < 0.005] = 0.02
+        out = ref_relu6(x)
+
+        self.inputs = {'X': OpTest.np_dtype_to_fluid_dtype(x)}
+        self.attrs = {'threshold': 6.0}
+        self.outputs = {'Out': out}
+
+    def set_npu(self):
+        self.__class__.use_npu = True
+
+    def test_check_output(self):
+        self.check_output_with_place(self.place)
+
+    def test_check_grad(self):
+        if self.dtype == np.float16:
+            return
+        self.check_grad_with_place(self.place, ['X'], 'Out')
+
+    def init_dtype(self):
+        self.dtype = np.float32
+
+
+class TestRelu6Float16(TestRelu6):
+    def set_npu(self):
+        self.__class__.use_npu = True
+        self.__class__.no_need_check_grad = True
+
+    def set_attrs(self):
+        self.dtype = np.float16
+
+    def test_check_output(self):
+        self.check_output_with_place(self.place)
+
+
+class TestReluNeg(TestRelu6):
+    def setUp(self):
+        self.set_npu()
+        self.op_type = "relu6"
+        self.place = paddle.NPUPlace(0)
+
+        self.init_dtype()
+        np.random.seed(SEED)
+        x = np.random.uniform(-10, -1, [10, 12]).astype(self.dtype)
+        x[np.abs(x) < 0.005] = 0.02
+        out = ref_relu6(x)
+
+        self.inputs = {'X': OpTest.np_dtype_to_fluid_dtype(x)}
+        self.attrs = {'threshold': 6.0}
+        self.outputs = {'Out': out}
+
+    def set_npu(self):
+        self.__class__.use_npu = True
+
+    def init_dtype(self):
+        self.dtype = np.float32
+
+    def test_check_output(self):
+        self.check_output_with_place(self.place)
+
+
+class TestRelu6Net(unittest.TestCase):
+    def _test(self, run_npu=True):
+        main_prog = paddle.static.Program()
+        startup_prog = paddle.static.Program()
+        main_prog.random_seed = SEED
+        startup_prog.random_seed = SEED
+        np.random.seed(SEED)
+
+        a_np = np.random.random(size=(32, 32)).astype('float32')
+        b_np = np.random.random(size=(32, 32)).astype('float32')
+        label_np = np.random.randint(2, size=(32, 1)).astype('int64')
+
+        with paddle.static.program_guard(main_prog, startup_prog):
+            a = paddle.static.data(name="a", shape=[32, 32], dtype='float32')
+            b = paddle.static.data(name="b", shape=[32, 32], dtype='float32')
+            label = paddle.static.data(
+                name="label", shape=[32, 1], dtype='int64')
+
+            sum = paddle.add(a, b)
+            z = paddle.nn.functional.relu6(sum)
+
+            fc_1 = fluid.layers.fc(input=z, size=128)
+            prediction = fluid.layers.fc(input=fc_1, size=2, act='softmax')
+
+            cost = fluid.layers.cross_entropy(input=prediction, label=label)
+            loss = fluid.layers.reduce_mean(cost)
+            sgd = fluid.optimizer.SGD(learning_rate=0.01)
+            sgd.minimize(loss)
+
+        if run_npu:
+            place = paddle.NPUPlace(0)
+        else:
+            place = paddle.CPUPlace()
+
+        exe = paddle.static.Executor(place)
+        exe.run(startup_prog)
+
+        print("Start run on {}".format(place))
+        for epoch in range(100):
+
+            pred_res, loss_res = exe.run(
+                main_prog,
+                feed={"a": a_np,
+                      "b": b_np,
+                      "label": label_np},
+                fetch_list=[prediction, loss])
+            if epoch % 10 == 0:
+                print("Epoch {} | Prediction[0]: {}, Loss: {}".format(
+                    epoch, pred_res[0], loss_res))
+
+        return pred_res, loss_res
+
+    def test_npu(self):
+        cpu_pred, cpu_loss = self._test(False)
+        npu_pred, npu_loss = self._test(True)
+
+        self.assertTrue(np.allclose(npu_pred, cpu_pred))
+        self.assertTrue(np.allclose(npu_loss, cpu_loss))
+
+
+if __name__ == '__main__':
+    unittest.main()