delete some redundant comments

paddle/fluid/operators/reader/create_py_array_reader_op.cc

@@ -29,9 +29,7 @@ class PyArrayReader : public framework::ReaderBase {
     *out = queue_->Dequeue();
   }
 
-  void ReInit() override {
-    // PADDLE_THROW("PyArrayReader does not support ReInit()");
-  }
+  void ReInit() override {}
 
  private:
   std::shared_ptr<PyArrayFeedQueue> queue_;

python/paddle/fluid/layers/io.py

@@ -449,7 +449,6 @@ def random_data_generator(low, high, shapes, lod_levels, for_parallel=True):
     return monkey_patch_reader_methods(main_prog_var)
 
 
-# UNCHECK(zengjinle)
 def py_array_reader(capacity,
                     shapes,
                     lod_levels,