AttributeError: module `numpy` has no attribute `int`. np.int was a deprecated alias for the builtin int

The `sliced` package contains an error due to NumPy version conflicts, see the [link](https://github.com/joshloyal/sliced/pull/15). 

A quick and  can be resolved by adding the following line:
```python
import numpy as np
np.int = np.int64
```
before using this library.