What happened?

Hi everyone !

I'm jumping into xbatcher for my work on climate data, thanks for the work, I think this library is going to be very useful for me !

Trying to understand the impact of each argument of the BatchGenerator, I tried to run the following code which raised me an error. BatchGenerator instance has len 16, however I cannot access index 3.

Does anyone know how to fix that ?

Thanks a lot.

What did you expect to happen?

No response

Minimal Complete Verifiable Example

import xarray as xr
import xbatcher as xb
import numpy as np 

ds = xr.DataArray(np.random.rand(30,30), name = 'var', dims = ['lat', 'lon'])
xbatcher = xb.BatchGenerator(
    ds=ds,
    input_dims={"lat": 6, 'lon': 6},
    batch_dims={"lat": 7, 'lon': 7},
    concat_input_dims=True,
)
print("Len :",len(xbatcher))
print(xbatcher[3])

Relevant log output

ValueError: min() arg is an empty sequence

Anything else we need to know?

No response

Environment

No response