[NPU] Add norm_grad kernel (#35237)

* [NPU] fix for test_norm_op_npu

* [NPU] add norm_grad

* [NPU] add CheckAxis for axis

* [NPU] delete debug codes

* norm can not use L2Normalize, norm_grad can use L2NormalizeGrad

* [NPU] delete useless codes

* [NPU] optimize norm_grad OpMaker

* Update python import path

paddle/fluid/operators/norm_op.cc

@@ -88,7 +88,11 @@ class NormOpGradOpMaker : public framework::SingleGradOpMaker<T> {
     op->SetAttrMap(this->Attrs());
     op->SetInput("X", this->Input("X"));
     op->SetInput(framework::GradVarName("Out"), this->OutputGrad("Out"));
+#ifndef PADDLE_WITH_ASCEND_CL
     op->SetInput("Norm", this->Output("Norm"));
+#else
+    op->SetInput("Out", this->Output("Out"));
+#endif
     op->SetOutput(framework::GradVarName("X"), this->InputGrad("X"));
   }
 };

paddle/fluid/operators/norm_op_npu.cc

@@ -15,24 +15,26 @@ limitations under the License. */
 namespace paddle {
 namespace operators {
 
-template <typename DeviceContext, typename T>
-class NormNPUKernel : public framework::OpKernel<T> {
- private:
-  void CheckAxis(int axis, int rank) const {
+using DDim = framework::DDim;
+using Tensor = framework::Tensor;
+
+void CheckAxis(int axis, int rank) {
   // check the axis is in [-rank, rank-1]
   if (axis <= rank - 1 && axis >= -rank) return;
   PADDLE_THROW(platform::errors::InvalidArgument(
       "axis in norm operator must between (%d) and (%d)"
       "but got (%d).",
       -rank, rank - 1, axis));
-  }
+}
 
+template <typename DeviceContext, typename T>
+class NormNPUKernel : public framework::OpKernel<T> {
  public:
-  void Compute(const framework::ExecutionContext& ctx) const override {
+  void Compute(const framework::ExecutionContext &ctx) const override {
     VLOG(4) << "Launch Norm Op Kernel on NPU." << std::endl;
-    auto* in_x = ctx.Input<framework::Tensor>("X");
-    auto* out_y = ctx.Output<framework::Tensor>("Out");
-    auto* out_norm = ctx.Output<framework::Tensor>("Norm");
+    auto *in_x = ctx.Input<framework::Tensor>("X");
+    auto *out_y = ctx.Output<framework::Tensor>("Out");
+    auto *out_norm = ctx.Output<framework::Tensor>("Norm");
     out_y->mutable_data<T>(ctx.GetPlace());
     out_norm->mutable_data<T>(ctx.GetPlace());
     auto xdim = in_x->dims();
@@ -46,7 +48,7 @@ class NormNPUKernel : public framework::OpKernel<T> {
     attr_input_norm["p"] = 2;
     attr_input_norm["keepdim"] = true;
     attr_input_norm["epsilon"] = eps;
-    const auto& runner =
+    const auto &runner =
         NpuOpRunner("LpNorm", {*in_x}, {*out_norm}, attr_input_norm);
     auto stream =
         ctx.template device_context<paddle::platform::NPUDeviceContext>()
@@ -56,12 +58,48 @@ class NormNPUKernel : public framework::OpKernel<T> {
   }
 };
 
+template <typename DeviceContext, typename T>
+class NormGradNPUKernel : public framework::OpKernel<T> {
+ public:
+  void Compute(const framework::ExecutionContext &ctx) const override {
+    float epsilon = ctx.Attr<float>("epsilon");
+    int axis = ctx.Attr<int>("axis");
+
+    auto *x = ctx.Input<Tensor>("X");
+    auto *y = ctx.Input<framework::Tensor>("Out");
+    auto *dy = ctx.Input<framework::Tensor>(framework::GradVarName("Out"));
+    auto *dx = ctx.Output<framework::Tensor>(framework::GradVarName("X"));
+
+    auto xdim = x->dims();
+    CheckAxis(axis, xdim.size());
+
+    auto place = ctx.GetPlace();
+
+    dx->mutable_data<T>(place);
+
+    framework::NPUAttributeMap attr_input_norm;
+    attr_input_norm["dim"] = std::vector<int>({axis});
+    attr_input_norm["eps"] = epsilon;
+    const auto &runner =
+        NpuOpRunner("L2NormalizeGrad", {*x, *y, *dy}, {*dx}, attr_input_norm);
+    auto stream =
+        ctx.template device_context<paddle::platform::NPUDeviceContext>()
+            .stream();
+    runner.Run(stream);
+  }
+};
+
 }  // namespace operators
 }  // namespace paddle
 
 namespace ops = paddle::operators;
 namespace plat = paddle::platform;
+
 REGISTER_OP_NPU_KERNEL(
     norm, ops::NormNPUKernel<paddle::platform::NPUDeviceContext, float>,
     ops::NormNPUKernel<paddle::platform::NPUDeviceContext,
                        paddle::platform::float16>)
+
+REGISTER_OP_NPU_KERNEL(
+    norm_grad, ops::NormGradNPUKernel<plat::NPUDeviceContext, float>,
+    ops::NormGradNPUKernel<plat::NPUDeviceContext, plat::float16>);

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

@@ -20,26 +20,18 @@ import unittest
 import numpy as np
 import paddle
 import paddle.fluid as fluid
-from op_test import OpTest, skip_check_grad_ci
+from paddle.fluid.tests.unittests.op_test import OpTest, skip_check_grad_ci
+from paddle.fluid.tests.unittests.test_norm_op import l2_norm
 
-SEED = 2021
 
-
-def l2_norm(x, axis, epsilon):
-    x2 = x**2
-    s = np.sum(x2, axis=axis, keepdims=True)
-    r = np.sqrt(s) + epsilon
-    y = x / np.broadcast_to(r, x.shape)
-    return y, r
-
-
-class TestNorm(OpTest):
+class TestNPUNormOp(OpTest):
     def setUp(self):
         paddle.enable_static()
         self.set_npu()
         self.place = paddle.NPUPlace(0)
         self.op_type = "norm"
         self.init_dtype()
+        self.init_test_case()
 
         x = np.random.random(self.shape).astype(self.dtype)
         y, norm = l2_norm(x, self.axis, self.epsilon)
@@ -52,6 +44,8 @@ class TestNorm(OpTest):
 
     def init_dtype(self):
         self.dtype = np.float32
+
+    def init_test_case(self):
         self.axis = 1
         self.epsilon = 1e-10
         self.shape = (2, 3, 4, 5)
@@ -59,29 +53,50 @@ class TestNorm(OpTest):
     def test_check_output(self):
         self.check_output_with_place(self.place)
 
+    def test_check_grad(self):
+        if self.dtype == np.float16:
+            return
 
-class TestNormOp2(TestNorm):
+        self.check_grad_with_place(
+            self.place, ['X'], 'Out', max_relative_error=0.006)
+
+
+class TestNPUNormOp2(TestNPUNormOp):
     def init_test_case(self):
         self.shape = [5, 3, 9, 7]
         self.axis = 0
         self.epsilon = 1e-8
-        self.dtype = np.float32
 
 
-class TestNormOp3(TestNorm):
+class TestNPUNormOp3(TestNPUNormOp):
     def init_test_case(self):
         self.shape = [5, 3, 2, 7]
         self.axis = -1
         self.epsilon = 1e-8
-        self.dtype = np.float32
 
 
-class TestNormOp4(TestNorm):
+@skip_check_grad_ci(reason="'check_grad' on large inputs is too slow, " +
+                    "however it is desirable to cover the forward pass")
+class TestNPUNormOp4(TestNPUNormOp):
     def init_test_case(self):
         self.shape = [128, 1024, 14, 14]
         self.axis = 2
         self.epsilon = 1e-8
-        self.dtype = np.float32
+
+    def test_check_grad(self):
+        pass
+
+
+@skip_check_grad_ci(reason="'check_grad' on large inputs is too slow, " +
+                    "however it is desirable to cover the forward pass")
+class TestNPUNormOp5(TestNPUNormOp):
+    def init_test_case(self):
+        self.shape = [2048, 2048]
+        self.axis = 1
+        self.epsilon = 1e-8
+
+    def test_check_grad(self):
+        pass
 
 
 class API_NormTest(unittest.TestCase):
@@ -96,13 +111,15 @@ class API_NormTest(unittest.TestCase):
             self.assertRaises(TypeError, test_norm_x_type)
 
 
-class TestNormFP16(TestNorm):
+class TestNPUNormOpFP16(TestNPUNormOp):
     def set_npu(self):
         self.__class__.use_npu = True
         self.__class__.no_need_check_grad = True
 
     def init_dtype(self):
         self.dtype = np.float16
+
+    def init_test_case(self):
         self.axis = -1
         self.epsilon = 1e-10
         self.shape = (2, 3, 100)