Made learning rate the input

paddle/operators/rmsprop_op.cc

@@ -24,11 +24,13 @@ class RmspropOp : public framework::OperatorWithKernel {
  protected:
   void InferShape(framework::InferShapeContextBase *ctx) const override {
     PADDLE_ENFORCE(ctx->HasInput("Param"),
-                   "Input(param) of RmspropOp should not be null.");
+                   "Input(Param) of RmspropOp should not be null.");
     PADDLE_ENFORCE(ctx->HasInput("Grad"),
-                   "Input(grad) of RmspropOp should not be null.");
+                   "Input(Grad) of RmspropOp should not be null.");
     PADDLE_ENFORCE(ctx->HasInput("Moment"),
-                   "Input(moment) of RmspropOp should not be null.");
+                   "Input(Moment) of RmspropOp should not be null.");
+    PADDLE_ENFORCE(ctx->HasInput("LearningRate"),
+                   "Input(LearningRate) of RmspropOp should not be null.");
 
     PADDLE_ENFORCE(ctx->HasOutput("ParamOut"),
                    "Output(param_out) of RmspropOp should not be null.");
@@ -43,6 +45,10 @@ class RmspropOp : public framework::OperatorWithKernel {
         param_dim, ctx->GetInputDim("Moment"),
         "Param and moment input of RmspropOp should have the same dimension.");
 
+    auto lr_dim = ctx->GetInputDim("LearningRate");
+    PADDLE_ENFORCE_EQ(framework::product(lr_dim), 1,
+                      "Learning Rate should be a scalar.");
+
     ctx->SetOutputDim("ParamOut", param_dim);
     ctx->SetOutputDim("MomentOut", param_dim);
   }
@@ -56,11 +62,11 @@ class RmspropOpMaker : public framework::OpProtoAndCheckerMaker {
     AddInput("Param", "Input parameter");
     AddInput("Grad", "Input gradient");
     AddInput("Moment", "Second moment");
+    AddInput("LearningRate", "Learning Rate");
 
     AddOutput("ParamOut", "Output parameter");
     AddOutput("MomentOut", "Output second moment");
 
-    AddAttr<float>("learningRate", "Learning rate");
     AddAttr<float>("epsilon", "Constant for numerical stability");
     AddAttr<float>("decayRate", "Decay rate for moving average of gradients");
     AddComment(R"DOC(
@@ -68,7 +74,7 @@ class RmspropOpMaker : public framework::OpProtoAndCheckerMaker {
 RMSprop
 
 MomentOut = decayRate * Moment + (1 - decayRate) * Grad * Grad
-ParamOut = Param - learningRate * Grad / (sqrt(MomentOut) + epsilon)
+ParamOut = Param - LearningRate * Grad / (sqrt(MomentOut) + epsilon)
 
 The original slide(Slide 29 of
 http://www.cs.toronto.edu/~tijmen/csc321/slides/lecture_slides_lec6.pdf)

paddle/operators/rmsprop_op.h

@@ -34,13 +34,13 @@ class RmspropOpKernel : public framework::OpKernel<T> {
     param_out->mutable_data<T>(ctx.GetPlace());
     moment_out->mutable_data<T>(ctx.GetPlace());
 
-    float lr = ctx.Attr<float>("learningRate");
     float epsilon = ctx.Attr<float>("epsilon");
     float decay = ctx.Attr<float>("decayRate");
 
     auto p = EigenVector<T>::Flatten(*ctx.Input<Tensor>("Param"));
     auto g = EigenVector<T>::Flatten(*ctx.Input<Tensor>("Grad"));
     auto m = EigenVector<T>::Flatten(*ctx.Input<Tensor>("Moment"));
+    float lr = ctx.Input<Tensor>("LearningRate")->data<float>()[0];
     auto p_out = EigenVector<T>::Flatten(*param_out);
     auto m_out = EigenVector<T>::Flatten(*moment_out);
     auto place = ctx.GetEigenDevice<Place>();

python/paddle/v2/framework/tests/test_rmsprop_op.py

@@ -10,19 +10,20 @@ class TestRmspropOp(OpTest):
         param = np.random.random((123, 321)).astype("float32")
         grad = np.random.random((123, 321)).astype("float32")
         moment = np.zeros((123, 321)).astype("float32")
+        learning_rate = np.array([0.01]).astype("float32")
 
-        learning_rate = 0.01
         epsilon = 1e-6
         decay_rate = 0.9
 
-        self.inputs = {'Param': param, 'Grad': grad, 'Moment': moment}
-
-        self.attrs = {
-            'learningRate': learning_rate,
-            'epsilon': epsilon,
-            'decayRate': decay_rate
+        self.inputs = {
+            'Param': param,
+            'Grad': grad,
+            'Moment': moment,
+            'LearningRate': learning_rate
         }
 
+        self.attrs = {'epsilon': epsilon, 'decayRate': decay_rate}
+
         moment_out = decay_rate * moment + (1 - decay_rate) * grad * grad
         param_out = param - learning_rate * grad / (np.sqrt(moment_out) +
                                                     epsilon)