update random normal seed logic

mindspore/ccsrc/backend/kernel_compiler/gpu/math/random_op_gpu_kernel.h

@@ -81,23 +81,18 @@ class RandomOpGpuKernel : public GpuKernel {
     switch (random_op_type_) {
       case RANDOM_OP_NORMAL: {
         float *mask_f = GetDeviceAddress<float>(outputs, 0);
-        if (!states_init_) {
-          int RNG_seed = 0;
-          std::random_device rd;
-          if (seed2_ != 0) {
-            RNG_seed = seed2_;
-          } else if (seed_ != 0) {
-            RNG_seed = seed_;
-          } else {
-            RNG_seed = static_cast<int>(rd());
-          }
-          CHECK_CURAND_RET_WITH_EXCEPT(curandCreateGenerator(&mask_generator_, CURAND_RNG_PSEUDO_PHILOX4_32_10),
-                                       "Failed to create generator");
-          CHECK_CURAND_RET_WITH_EXCEPT(curandSetPseudoRandomGeneratorSeed(mask_generator_, RNG_seed),
-                                       "Failed to SetPseudoRandomGeneratorSeed");
-          MS_EXCEPTION_IF_NULL(mask_generator_);
-          states_init_ = true;
+        std::random_device rd;
+        int RNG_seed = static_cast<int>(rd());
+        if (seed2_ != 0) {
+          RNG_seed = seed2_;
+        } else if (seed_ != 0) {
+          RNG_seed = seed_;
         }
+        CHECK_CURAND_RET_WITH_EXCEPT(curandCreateGenerator(&mask_generator_, CURAND_RNG_PSEUDO_PHILOX4_32_10),
+                                     "Failed to create generator");
+        CHECK_CURAND_RET_WITH_EXCEPT(curandSetPseudoRandomGeneratorSeed(mask_generator_, RNG_seed),
+                                     "Failed to SetPseudoRandomGeneratorSeed");
+        MS_EXCEPTION_IF_NULL(mask_generator_);
         CHECK_CURAND_RET_WITH_EXCEPT(curandSetStream(mask_generator_, reinterpret_cast<cudaStream_t>(stream_ptr)),
                                      "Failed to set stream for generator");
         // curandGen only support float or double for mask.