def create_empty_dataset(self, ds_name, dtype=np.float32):
if ds_name in self._datasets:<EOL><INDENT>return self._datasets[ds_name]<EOL><DEDENT>ds = self._group.create_dataset(ds_name, (<NUM_LIT:1>, <NUM_LIT:1>), maxshape=None,<EOL>dtype=dtype)<EOL>self._datasets[ds_name] = ds<EOL>return ds<EOL>
Creates a Dataset with unknown size.
Resize it before using.

:param ds_name: string

:param dtype: dtype
Datatype of the dataset

:return: h5py DataSet