Fix type error in adagrad_kernel (#51790)

paddle/phi/kernels/gpu/adagrad_kernel.cu

@@ -37,7 +37,7 @@ __global__ void AdagradGPUKernel(const T* param,
                                  MT* master_param_out,
                                  int num) {
   auto idx = blockDim.x * blockIdx.x + threadIdx.x;
-  MT lr_data = static_cast<T>(lr[0]);
+  MT lr_data = static_cast<MT>(lr[0]);
 
   for (int i = idx; i < num; i += blockDim.x * gridDim.x) {
     MT grad_data = static_cast<MT>(grad[i]);
@@ -47,7 +47,7 @@ __global__ void AdagradGPUKernel(const T* param,
     MT param_out_data =
         in - (lr_data * grad_data) / (sqrt(moment_out_data) + epsilon);
 
-    param_out[i] = static_cast<MT>(param_out_data);
+    param_out[i] = static_cast<T>(param_out_data);
 
     if (master_param_out) {
       master_param_out[i] = param_out_data;

python/paddle/fluid/optimizer.py

@@ -2081,7 +2081,11 @@ class AdagradOptimizer(Optimizer):
         for p in parameters:
             if self._multi_precision and self._is_dtype_fp16_or_bf16(p.dtype):
                 master_p = self._create_master_weight(p)
-                self._add_accumulator(self._moment_acc_str, master_p)
+                self._add_accumulator(
+                    self._moment_acc_str,
+                    master_p,
+                    fill_value=self.initial_accumulator_value,
+                )
                 continue
             if (
                 self._is_dtype_fp16_or_bf16(p.dtype)

python/paddle/optimizer/adagrad.py

@@ -146,7 +146,11 @@ class Adagrad(Optimizer):
                 continue
             if self._multi_precision and self._is_dtype_fp16_or_bf16(p.dtype):
                 master_p = self._create_master_weight(p)
-                self._add_accumulator(self._moment_acc_str, master_p)
+                self._add_accumulator(
+                    self._moment_acc_str,
+                    master_p,
+                    fill_value=self.initial_accumulator_value,
+                )
                 self._already_create_accumulater.add(p.name)
                 continue
             if (