Import error on colab with version 1.5.1

[akshay-krishnan]

I get the following error when simply installing and importing dataclass_array on a colab.

!pip install dataclass-array

import dataclass_array as dca

raises:

[/usr/local/lib/python3.10/dist-packages/dataclass_array/array_dataclass.py](https://localhost:8080/#) in DataclassArray()
    582   # ====== Internal ======
    583 
--> 584   @epy.cached_property
    585   def _all_fields_empty(self) -> bool:
    586     """Returns True if the `dataclass_array` is invalid."""

AttributeError: module 'etils.epy' has no attribute 'cached_property'

Not sure what I am missing. Any help would be great. Thanks in advance!