[MINOR] Fix deprication warning Python
diff --git a/src/main/python/systemds/utils/converters.py b/src/main/python/systemds/utils/converters.py
index eeba836..458cfb9 100644
--- a/src/main/python/systemds/utils/converters.py
+++ b/src/main/python/systemds/utils/converters.py
@@ -42,7 +42,7 @@
else:
arr = np_arr.ravel().astype(np.float64)
value_type = jvm.org.apache.sysds.common.Types.ValueType.FP64
- buf = bytearray(arr.tostring())
+ buf = bytearray(arr.tobytes())
convert_method = jvm.org.apache.sysds.runtime.util.Py4jConverterUtils.convertPy4JArrayToMB
return convert_method(buf, rows, cols, value_type)