eval.py

from __future__ import print_function, absolute_import
import pdb

__all__ = ['accuracy','wrong_index']

def accuracy(output, target, topk=(1,)):
    """Computes the precision@k for the specified values of k"""
    maxk = max(topk)
    batch_size = target.size(0)

    _, pred = output.topk(maxk, 1, True, True)
    pred = pred.t()
    correct = pred.eq(target.view(1, -1).expand_as(pred))

    res = []
    for k in topk:
        correct_k = correct[:k].view(-1).float().sum(0)
        res.append(correct_k.mul_(100.0 / batch_size))
    return res


def wrong_index(output,target,index,topk=(1,)):
    maxk = max(topk)
    batch_size = target.size(0)

    _, pred = output.topk(maxk, 1, True, True)
    pred = pred.t()
    correct = pred.eq(target.view(1, -1).expand_as(pred))

    #res = []
    #for k in topk:
    correct_k = correct[:1].view(-1)
    out = index[~correct_k]
    pred = pred.view(-1)
    pre = pred[~correct_k]
        #correct_k = correct[:k].view(-1).float().sum(0)
        #res.append(correct_k.mul_(100.0 / batch_size))
    return out,pre