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import os
import time
import string
import argparse
import torch
import torch.backends.cudnn as cudnn
import torch.utils.data
import torch.nn.functional as F
import numpy as np
from nltk.metrics.distance import edit_distance
from utils import CTCLabelConverter, AttnLabelConverter, Averager
from dataset import hierarchical_dataset, AlignCollate
from model import Model
def validation(model, criterion, evaluation_loader, converter, opt, device):
""" validation or evaluation """
n_correct = 0
norm_ED = 0
length_of_data = 0
infer_time = 0
valid_loss_avg = Averager()
for i, (image_tensors, labels) in enumerate(evaluation_loader):
batch_size = image_tensors.size(0)
length_of_data = length_of_data + batch_size
image = image_tensors.to(device)
# For max length prediction
length_for_pred = torch.IntTensor([opt.batch_max_length] * batch_size).to(device)
text_for_pred = torch.LongTensor(batch_size, opt.batch_max_length + 1).fill_(0).to(device)
text_for_loss, length_for_loss = converter.encode(labels, batch_max_length=opt.batch_max_length)
start_time = time.time()
if 'CTC' in opt.Prediction:
preds = model(image, text_for_pred)
forward_time = time.time() - start_time
# Calculate evaluation loss for CTC decoder.
preds_size = torch.IntTensor([preds.size(1)] * batch_size)
# permute 'preds' to use CTCloss format
cost = criterion(preds.log_softmax(2).permute(1, 0, 2), text_for_loss, preds_size, length_for_loss)
if opt.decode == 'greedy':
# Select max probabilty (greedy decoding) then decode index to character
_, preds_index = preds.max(2)
preds_index = preds_index.view(-1)
preds_str = converter.decode_greedy(preds_index.data, preds_size.data)
elif opt.decode == 'beamsearch':
preds_str = converter.decode_beamsearch(preds, beamWidth=2)
else:
preds = model(image, text_for_pred, is_train=False)
forward_time = time.time() - start_time
preds = preds[:, :text_for_loss.shape[1] - 1, :]
target = text_for_loss[:, 1:] # without [GO] Symbol
cost = criterion(preds.contiguous().view(-1, preds.shape[-1]), target.contiguous().view(-1))
# select max probabilty (greedy decoding) then decode index to character
_, preds_index = preds.max(2)
preds_str = converter.decode(preds_index, length_for_pred)
labels = converter.decode(text_for_loss[:, 1:], length_for_loss)
infer_time += forward_time
valid_loss_avg.add(cost)
# calculate accuracy & confidence score
preds_prob = F.softmax(preds, dim=2)
preds_max_prob, _ = preds_prob.max(dim=2)
confidence_score_list = []
for gt, pred, pred_max_prob in zip(labels, preds_str, preds_max_prob):
if 'Attn' in opt.Prediction:
gt = gt[:gt.find('[s]')]
pred_EOS = pred.find('[s]')
pred = pred[:pred_EOS] # prune after "end of sentence" token ([s])
pred_max_prob = pred_max_prob[:pred_EOS]
if pred == gt:
n_correct += 1
'''
(old version) ICDAR2017 DOST Normalized Edit Distance https://rrc.cvc.uab.es/?ch=7&com=tasks
"For each word we calculate the normalized edit distance to the length of the ground truth transcription."
if len(gt) == 0:
norm_ED += 1
else:
norm_ED += edit_distance(pred, gt) / len(gt)
'''
# ICDAR2019 Normalized Edit Distance
if len(gt) == 0 or len(pred) ==0:
norm_ED += 0
elif len(gt) > len(pred):
norm_ED += 1 - edit_distance(pred, gt) / len(gt)
else:
norm_ED += 1 - edit_distance(pred, gt) / len(pred)
# calculate confidence score (= multiply of pred_max_prob)
try:
confidence_score = pred_max_prob.cumprod(dim=0)[-1]
except:
confidence_score = 0 # for empty pred case, when prune after "end of sentence" token ([s])
confidence_score_list.append(confidence_score)
# print(pred, gt, pred==gt, confidence_score)
accuracy = n_correct / float(length_of_data) * 100
norm_ED = norm_ED / float(length_of_data) # ICDAR2019 Normalized Edit Distance
return valid_loss_avg.val(), accuracy, norm_ED, preds_str, confidence_score_list, labels, infer_time, length_of_data
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