change the limit of thead num

paddle/fluid/operators/optimizers/adam_op.h

@@ -490,9 +490,10 @@ class AdamOpKernel : public framework::OpKernel<T> {
                   << FLAGS_inner_op_parallelism
                   << " min_param_size_to_use_multithread="
                   << FLAGS_min_param_size_to_use_multithread;
-          PADDLE_ENFORCE_LE(
-              FLAGS_inner_op_parallelism, 8,
-              "FLAGS_inner_op_parallelism should not be larger then 8");
+          if (FLAGS_inner_op_parallelism > 10) {
+            LOG(WARNING) << "FLAGS_inner_op_parallelism "
+                         << FLAGS_inner_op_parallelism << " is two large!";
+          }
           auto& grad_rows = grad_merge.rows();
           std::unordered_map<size_t, int> row_id_to_grad_row_offset;
           size_t param_row_count = param.numel() / row_numel;