Function "numpy.array" is not valid as a type in python 3.7

[hepengfe]

Describe the bug
Function "numpy.array" is not valid as a type in python 3.7
https://github.com/asyml/forte-wrappers/runs/5368209215?check_suite_focus=true#step:11:14

To Reproduce
use numpy.array as a return type

failed package version: python==3.7, numpy==1.21.5
passed package version: python==3.6, numpy==1.19.5

Expected behavior
It's expected the return type numpy.array is recognized in all versions satisfy requirements.

Screenshots
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Environment (please complete the following information):

• OS: [e.g. iOS]
• Version [e.g. 22]
• Python and Package verions: [e.g. Python version, Pytorch version]

Additional context
Add any other context about the problem here.

[ceteri]

Might work better to use np.ndarray as the returned type?
https://numpy.org/doc/stable/reference/generated/numpy.array.html#numpy.array