“Got 1 columns instead of …” error in numpy

Question

I\'m working on the following code for performing Random Forest Classification on train and test sets;

from sklearn.ensemble import RandomForestClassifier
fr         


        

Answer 1

You have too many columns in one of your rows. For example

>>> import numpy as np
>>> from StringIO import StringIO
>>> s = """
... 1 2 3 4
... 1 2 3 4 5
... """
>>> np.genfromtxt(StringIO(s),delimiter=" ")
Traceback (most recent call last):
  File "", line 1, in 
  File "/usr/lib64/python2.6/site-packages/numpy/lib/npyio.py", line 1654, in genfromtxt
    raise ValueError(errmsg)
ValueError: Some errors were detected !
    Line #2 (got 5 columns instead of 4)