forked from ai-adv-lab/deepspeech.mxnet
/
stt_metric.py
428 lines (362 loc) · 16.3 KB
/
stt_metric.py
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# -*- coding: utf-8 -*-
import socket
import editdistance
import mxnet as mx
import numpy as np
# import editdistance
from label_util import LabelUtil
from log_util import LogUtil
from ctc_beam_search_decoder import ctc_beam_search_decoder, ctc_beam_search_decoder_log
import kenlm
import time
from itertools import groupby
# import tensorflow as tf
# from tensorflow.python.framework import ops
# from tensorflow.python.ops import array_ops
def check_label_shapes(labels, preds, shape=0):
"""Check to see if the two arrays are the same size."""
if shape == 0:
label_shape, pred_shape = len(labels), len(preds)
else:
label_shape, pred_shape = labels.shape, preds.shape
if label_shape != pred_shape:
raise ValueError("Shape of labels {} does not match shape of "
"predictions {}".format(label_shape, pred_shape))
class STTMetric(mx.metric.EvalMetric):
def __init__(self, batch_size, num_gpu, is_epoch_end=False, is_logging=True):
super(STTMetric, self).__init__('STTMetric')
self.batch_size = batch_size
self.num_gpu = num_gpu
self.total_n_label = 0
self.total_l_dist = 0
self.is_epoch_end = is_epoch_end
self.total_ctc_loss = 0.
self.batch_loss = 0.
self.is_logging = is_logging
self.audio_paths = []
def set_audio_paths(self, audio_paths):
self.audio_paths = audio_paths
def update(self, labels, preds):
check_label_shapes(labels, preds)
if self.is_logging:
log = LogUtil().getlogger()
labelUtil = LabelUtil()
self.batch_loss = 0.
# log.info(self.audio_paths)
host_name = socket.gethostname()
for label, pred in zip(labels, preds):
label = label.asnumpy()
pred = pred.asnumpy()
seq_length = len(pred) / int(int(self.batch_size) / int(self.num_gpu))
for i in range(int(int(self.batch_size) / int(self.num_gpu))):
l = remove_blank(label[i])
p = []
probs = []
for k in range(int(seq_length)):
p.append(np.argmax(pred[k * int(int(self.batch_size) / int(self.num_gpu)) + i]))
probs.append(pred[k * int(int(self.batch_size) / int(self.num_gpu)) + i])
p = pred_best(p)
l_distance = levenshtein_distance(l, p)
# l_distance = editdistance.eval(labelUtil.convert_num_to_word(l).split(" "), res)
self.total_n_label += len(l)
self.total_l_dist += l_distance
this_cer = float(l_distance) / float(len(l))
if self.is_logging and this_cer > 0.4:
log.info("%s label: %s " % (host_name, labelUtil.convert_num_to_word(l)))
log.info("%s pred : %s , cer: %f (distance: %d/ label length: %d)" % (
host_name, labelUtil.convert_num_to_word(p), this_cer, l_distance, len(l)))
# log.info("ctc_loss: %.2f" % ctc_loss(l, pred, i, int(seq_length), int(self.batch_size), int(self.num_gpu)))
self.num_inst += 1
self.sum_metric += this_cer
# if self.is_epoch_end:
# loss = ctc_loss(l, pred, i, int(seq_length), int(self.batch_size), int(self.num_gpu))
# self.batch_loss += loss
# if self.is_logging:
# log.info("loss: %f " % loss)
self.total_ctc_loss += 0 # self.batch_loss
def get_batch_loss(self):
return self.batch_loss
def get_name_value(self):
total_cer = float(self.total_l_dist) / (float(self.total_n_label) if self.total_n_label > 0 else 0.001)
return total_cer, self.total_n_label, self.total_l_dist, self.total_ctc_loss
def reset(self):
self.total_n_label = 0
self.total_l_dist = 0
self.num_inst = 0
self.sum_metric = 0.0
self.total_ctc_loss = 0.0
self.audio_paths = []
class EvalSTTMetric(STTMetric):
def __init__(self, batch_size, num_gpu, is_epoch_end=False, is_logging=True, scorer=None):
super(EvalSTTMetric, self).__init__(batch_size=batch_size, num_gpu=num_gpu, is_epoch_end=is_epoch_end,
is_logging=is_logging)
self.placeholder = ""
self.total_l_dist_beam = 0
self.total_l_dist_beam_cpp = 0
self.scorer = scorer
def update(self, labels, preds):
check_label_shapes(labels, preds)
if self.is_logging:
log = LogUtil().getlogger()
labelUtil = LabelUtil()
self.batch_loss = 0.
shouldPrint = True
host_name = socket.gethostname()
for label, pred in zip(labels, preds):
label = label.asnumpy()
pred = pred.asnumpy()
seq_length = len(pred) / int(int(self.batch_size) / int(self.num_gpu))
# sess = tf.Session()
for i in range(int(int(self.batch_size) / int(self.num_gpu))):
l = remove_blank(label[i])
# p = []
probs = []
for k in range(int(seq_length)):
# p.append(np.argmax(pred[k * int(int(self.batch_size) / int(self.num_gpu)) + i]))
probs.append(pred[k * int(int(self.batch_size) / int(self.num_gpu)) + i])
# p = pred_best(p)
probs = np.array(probs)
st = time.time()
beam_size = 20
results = ctc_beam_decode(self.scorer, beam_size, labelUtil.byList, probs)
log.info("decode by ctc_beam cost %.2f result: %s" % (time.time() - st, "\n".join(results)))
res_str1 = ctc_greedy_decode(probs, labelUtil.byList)
log.info("decode by pred_best: %s" % res_str1)
# max_time_steps = int(seq_length)
# input_log_prob_matrix_0 = np.log(probs) # + 2.0
#
# # len max_time_steps array of batch_size x depth matrices
# inputs = ([
# input_log_prob_matrix_0[t, :][np.newaxis, :] for t in range(max_time_steps)]
# )
#
# inputs_t = [ops.convert_to_tensor(x) for x in inputs]
# inputs_t = array_ops.stack(inputs_t)
#
# st = time.time()
# # run CTC beam search decoder in tensorflow
# decoded, log_probabilities = tf.nn.ctc_beam_search_decoder(inputs_t,
# [max_time_steps],
# beam_width=10,
# top_paths=3,
# merge_repeated=False)
# tf_decoded, tf_log_probs = sess.run([decoded, log_probabilities])
# st1 = time.time() - st
# for index in range(3):
# tf_result = ''.join([labelUtil.byIndex.get(i + 1, ' ') for i in tf_decoded[index].values])
# print("%.2f elpse %.2f, %s" % (tf_log_probs[0][index], st1, tf_result))
l_distance = editdistance.eval(labelUtil.convert_num_to_word(l).split(" "), res_str1)
# l_distance_beam = editdistance.eval(labelUtil.convert_num_to_word(l).split(" "), beam_result[0][1])
l_distance_beam_cpp = editdistance.eval(labelUtil.convert_num_to_word(l).split(" "), results[0])
self.total_n_label += len(l)
# self.total_l_dist_beam += l_distance_beam
self.total_l_dist_beam_cpp += l_distance_beam_cpp
self.total_l_dist += l_distance
this_cer = float(l_distance) / float(len(l))
if self.is_logging:
# log.info("%s label: %s " % (host_name, labelUtil.convert_num_to_word(l)))
# log.info("%s pred : %s , cer: %f (distance: %d/ label length: %d)" % (
# host_name, labelUtil.convert_num_to_word(p), this_cer, l_distance, len(l)))
log.info("%s label: %s " % (host_name, labelUtil.convert_num_to_word(l)))
log.info("%s pred : %s , cer: %f (distance: %d/ label length: %d)" % (
host_name, res_str1, this_cer, l_distance, len(l)))
# log.info("%s predb: %s , cer: %f (distance: %d/ label length: %d)" % (
# host_name, " ".join(beam_result[0][1]), float(l_distance_beam) / len(l), l_distance_beam,
# len(l)))
log.info("%s predc: %s , cer: %f (distance: %d/ label length: %d)" % (
host_name, " ".join(results[0]), float(l_distance_beam_cpp) / len(l), l_distance_beam_cpp,
len(l)))
self.total_ctc_loss += self.batch_loss
self.placeholder = res_str1 + "\n" + "\n".join(results)
def get_name_value(self):
total_cer = float(self.total_l_dist) / (float(self.total_n_label) if self.total_n_label > 0 else 0.001)
# total_cer_beam = float(self.total_l_dist_beam) / (
# float(self.total_n_label) if self.total_n_label > 0 else 0.001)
total_cer_beam_cpp = float(self.total_l_dist_beam_cpp) / (
float(self.total_n_label) if self.total_n_label > 0 else 0.001)
return total_cer, total_cer_beam_cpp, self.total_n_label, self.total_l_dist, \
self.total_l_dist_beam_cpp, self.total_ctc_loss
def reset(self):
self.total_n_label = 0
self.total_l_dist = 0
self.total_l_dist_beam = 0
self.total_l_dist_beam_cpp = 0
self.num_inst = 0
self.sum_metric = 0.0
self.total_ctc_loss = 0.0
self.audio_paths = []
def ctc_greedy_decoder_py(probs_seq, vocabulary):
"""CTC greedy (best path) decoder.
Path consisting of the most probable tokens are further post-processed to
remove consecutive repetitions and all blanks.
:param probs_seq: 2-D list of probabilities over the vocabulary for each
character. Each element is a list of float probabilities
for one character.
:type probs_seq: list
:param vocabulary: Vocabulary list.
:type vocabulary: list
:return: Decoding result string.
:rtype: baseline
"""
# dimension verification
for probs in probs_seq:
if not len(probs) == len(vocabulary) + 1:
raise ValueError("probs_seq dimension mismatchedd with vocabulary")
# argmax to get the best index for each time step
max_index_list = list(np.array(probs_seq).argmax(axis=1))
# remove consecutive duplicate indexes
index_list = [index_group[0] for index_group in groupby(max_index_list)]
# remove blank indexes
blank_index = len(vocabulary)
index_list = [index for index in index_list if index != blank_index]
# convert index list to string
return ''.join([vocabulary[index].decode("utf-8") for index in index_list])
def ctc_greedy_decode(probs, vocab):
vocab_list = [chars.encode("utf-8") for chars in vocab]
probs = np.c_[probs[:, 1:], probs[:, 0]]
try:
from swig_wrapper import ctc_greedy_decoder
return ctc_greedy_decoder(probs, vocab_list)
except ImportError:
return ctc_greedy_decoder_py(probs, vocab_list)
def ctc_beam_decode(scorer, beam_size, vocab, probs):
try:
from swig_wrapper import ctc_beam_search_decoder
vocab_list = [chars.encode("utf-8") for chars in vocab]
probs = np.c_[probs[:, 1:], probs[:, 0]]
beam_search_results = ctc_beam_search_decoder(
probs_seq=np.array(probs),
vocabulary=vocab_list,
beam_size=beam_size,
ext_scoring_func=scorer,
cutoff_prob=0.99,
cutoff_top_n=40
)
results = [result[1] for result in beam_search_results]
except ImportError:
beam_result = ctc_beam_search_decoder_log(
probs_seq=probs,
beam_size=beam_size,
vocabulary=dict(zip(range(1, len(vocab) + 1), vocab)),
blank_id=0,
cutoff_prob=0.99,
ext_scoring_func=scorer
)
results = [result[1] for result in beam_result]
return results
def pred_best(p):
ret = []
p1 = [0] + p
for i in range(len(p)):
c1 = p1[i]
c2 = p1[i + 1]
if c2 == 0 or c2 == c1:
continue
ret.append(c2)
return ret
def remove_blank(l):
ret = []
for i in range(l.size):
if l[i] == 0:
break
ret.append(l[i])
return ret
def remove_space(l):
labelUtil = LabelUtil()
ret = []
for i in range(len(l)):
if l[i] != labelUtil.get_space_index():
ret.append(l[i])
return ret
def ctc_loss(label, prob, remainder, seq_length, batch_size, num_gpu=1, big_num=1e10):
label_ = [0, 0]
prob[prob < 1 / big_num] = 1 / big_num
log_prob = np.log(prob)
l = len(label)
for i in range(l):
label_.append(int(label[i]))
label_.append(0)
l_ = 2 * l + 1
a = np.full((seq_length, l_ + 1), -big_num)
a[0][1] = log_prob[remainder][0]
a[0][2] = log_prob[remainder][label_[2]]
for i in range(1, seq_length):
row = i * int(batch_size / num_gpu) + remainder
a[i][1] = a[i - 1][1] + log_prob[row][0]
a[i][2] = np.logaddexp(a[i - 1][2], a[i - 1][1]) + log_prob[row][label_[2]]
for j in range(3, l_ + 1):
a[i][j] = np.logaddexp(a[i - 1][j], a[i - 1][j - 1])
if label_[j] != 0 and label_[j] != label_[j - 2]:
a[i][j] = np.logaddexp(a[i][j], a[i - 1][j - 2])
a[i][j] += log_prob[row][label_[j]]
return -np.logaddexp(a[seq_length - 1][l_], a[seq_length - 1][l_ - 1])
# label is done with remove_blank
# pred is got from pred_best
def levenshtein_distance(label, pred):
n_label = len(label) + 1
n_pred = len(pred) + 1
if (label == pred):
return 0
if (len(label) == 0):
return len(pred)
if (len(pred) == 0):
return len(label)
v0 = [i for i in range(n_label)]
v1 = [0 for i in range(n_label)]
for i in range(len(pred)):
v1[0] = i + 1
for j in range(len(label)):
cost = 0 if label[j] == pred[i] else 1
v1[j + 1] = min(v1[j] + 1, v0[j + 1] + 1, v0[j] + cost)
for j in range(n_label):
v0[j] = v1[j]
return v1[len(label)]
def char_match_1way(char_label, char_pred, criteria, n_whole_label):
n_label = len(char_label)
n_pred = len(char_pred)
pred_pos = 0
accuracy = 0.
next_accu = 0.
n_matched = 0.
next_n_matched = 0.
for i_index in range(n_label):
tail_label = n_label - 1 - i_index
c_label = char_label[i_index]
for j_index in range(pred_pos, n_pred):
tail_pred = n_pred - 1 - j_index
c_pred = char_pred[j_index]
if tail_label < tail_pred * criteria or tail_pred < tail_label * criteria:
break
if c_label == c_pred:
n_matched += 1.0
pred_pos = j_index + 1
break
accuracy = n_matched / n_whole_label
if n_label > 0.7 * n_whole_label:
next_label = char_label[1:]
next_accu, next_n_matched = char_match_1way(next_label, char_pred, criteria, n_whole_label)
if next_accu > accuracy:
accuracy = next_accu
n_matched = next_n_matched
return accuracy, n_matched
def char_match_2way(label, pred):
criterias = [0.98, 0.96, 0.93, 0.9, 0.85, 0.8, 0.7]
r_pred = pred[::-1]
r_label = label[::-1]
n_whole_label = len(remove_space(label))
val1_max = 0.
val2_max = 0.
val1_max_matched = 0.
val2_max_matched = 0.
for criteria in criterias:
val1, val1_matched = char_match_1way(label, pred, criteria, n_whole_label)
val2, val2_matched = char_match_1way(r_label, r_pred, criteria, n_whole_label)
if val1 > val1_max:
val1_max = val1
val1_max_matched = val1_matched
if val2 > val2_max:
val2_max = val2
val2_max_matched = val2_matched
val = val1_max if val1_max > val2_max else val2_max
val_matched = val1_max_matched if val1_max > val2_max else val2_max_matched
return val, val_matched, n_whole_label