openclimatefix/gfs-reforecast · Fix a Not Defined Variable `filepath` in streaming=False mode, and reshape ndim of timestamp from 0 to 1

Fix 1:
add an argument filepath to fix the undefined variable filepath in _split_generators() function when streaming=False
Fix 2
fix the TypeError: object of type 'numpy.datetime64' has no len(), reshape the values of "timestamp" in dict value in _generate_examples() function to a numpy.array such that len(value["timestamp"])=1

test code block

 from datasets import load_dataset
 ds = load_dataset(path='openclimatefix/gfs-reforecast',
              revision='main',
              streaming=False,
              filepath="path to a local json file consists of relative paths to data files we want to load w.r.t. the gfs-reforecast folder"
              )