**FAQ and Known Issues**

- If you encounter the following exception when calling the Python API of Analytics Zoo when you are using Python 3.5 or 3.6:

```
Py4JJavaError: An error occurred while calling z:org.apache.spark.bigdl.api.python.BigDLSerDe.loads.
: net.razorvine.pickle.PickleException: expected zero arguments for construction of ClassDict (for numpy.dtype)
```

you may need to check whether your input argument involves Numpy types (such as `numpy.int64`

). See here for the related issue.

For example, invoking `np.min`

, `np.max`

, `np.unique`

, etc. will return type `numpy.int64`

. One way to solve this is to use `int()`

to convert a number of type `numpy.int64`

to a Python int.