Issue- "BadLayout: Invalid layout of the ARFF file, at line ..."

[j00n162]

Hello,

I tried to convert regular arff file format to sparse arff format through liac-arff.
I used the code below:

import arff
fp = open('est1.arff')
data = arff.load(fp)

X = arff.dumps(data)

from scipy import sparse
decoder = arff.ArffDecoder()
d = decoder.decode(X, encode_nominal=True, return_type=arff.COO)
data = d['data'][0]
row = d['data'][1]
col = d['data'][2]
matrix = sparse.coo_matrix((data, (row, col)), shape=(max(row)+1, max(col)+1))

However, it did not work, and the comment in console was "BadLayout: Invalid layout of the ARFF file, at line ..."

I am not sure what the problem is. Would you please help me to solve this issue?
Thank you.

[jnothman]

I think you should have got a generator only if you pass in a return_type parameter.

[j00n162]

Thank you for your comment. Where can I get a generator?

[jnothman]

Sorry, I was responding to the first version of this issue which complained that the output of loading was a Generator.

If your data is not a sparse ARFF, attempting COO return type will raise a BadLayout. Instead, load it dense, then convert to sparse.