Unexpected keyword argument passed to optimizer: amsbound

[stabilus]

I installed with
pip install keras-adabound
imported with:
from keras_adabound import AdaBound
and declared the optimizer as:
opt = AdaBound(lr=1e-03,final_lr=0.1, gamma=1e-03, weight_decay=0., amsbound=False)
Then, I'm getting the error:
TypeError: Unexpected keyword argument passed to optimizer: amsbound

changing the pip install to adabound (instead of keras-adabound) and the import to from adabound import AdaBound, the keyword amsbound is recognized, but then I get the error:
TypeError: __init__() missing 1 required positional argument: 'params'

Am I mixing something up here or missing something?