fix LoDTensorArray crash in Debug mode build (#37954)

paddle/fluid/pybind/reader_py.cc

@@ -37,6 +37,9 @@ PADDLE_DEFINE_EXPORTED_bool(
     "If set true, the queue.pop will only get data from queue but not "
     "remove the data from queue for speed testing");
 
+// disable auto conversion to list in Python
+PYBIND11_MAKE_OPAQUE(paddle::framework::LoDTensorArray);
+
 namespace paddle {
 namespace pybind {
 

python/paddle/fluid/dataloader/dataloader_iter.py

@@ -273,6 +273,8 @@ class _DataLoaderIterSingleProcess(_DataLoaderIterBase):
             else:
                 if self._return_list:
                     data = self._reader.read_next_list()
+                    for i in range(len(data)):
+                        data[i] = data[i]._move_to_list()
                     data = [
                         _restore_batch(d, s)
                         for d, s in zip(data, self._structure_infos[:len(
@@ -718,6 +720,8 @@ class _DataLoaderIterMultiProcess(_DataLoaderIterBase):
             else:
                 if self._return_list:
                     data = self._reader.read_next_list()
+                    for i in range(len(data)):
+                        data[i] = data[i]._move_to_list()
                     data = [
                         _restore_batch(d, s)
                         for d, s in zip(data, self._structure_infos[:len(

python/paddle/fluid/reader.py

@@ -1254,7 +1254,10 @@ class GeneratorLoader(DataLoaderBase):
     def __next__(self):
         try:
             if self._return_list:
-                return self._reader.read_next_list()
+                data = self._reader.read_next_list()
+                for i in range(len(data)):
+                    data[i] = data[i]._move_to_list()
+                return data
             else:
                 return self._reader.read_next()
         except StopIteration: