def valid(self):
'''Perform validation step (!!!NOTE!!! greedy decoding with Attention decoder only)'''
self.asr_model.eval()
# Init stats
val_loss, val_ctc, val_att, val_acc, val_cer = 0.0, 0.0, 0.0, 0.0, 0.0
val_len = 0
all_pred, all_true = [], []
# Perform validation
for cur_b, (x, y) in enumerate(self.dev_set):
self.progress(' '.join([
'Valid step -',
str(self.step), '(',
str(cur_b), '/',
str(len(self.dev_set)), ')'
]))
# Prepare data
if len(x.shape) == 4: x = x.squeeze(0)
if len(y.shape) == 3: y = y.squeeze(0)
x = x.to(device=self.device, dtype=torch.float32)
y = y.to(device=self.device, dtype=torch.long)
state_len = torch.sum(torch.sum(x.cpu(), dim=-1) != 0, dim=-1)
state_len = [int(sl) for sl in state_len]
ans_len = int(torch.max(torch.sum(y != 0, dim=-1)))
# Forward
ctc_pred, state_len, att_pred, att_maps = self.asr_model(
x, ans_len + VAL_STEP, state_len=state_len)
# Compute attention loss & get decoding results
label = y[:, 1:ans_len + 1].contiguous()
if self.ctc_weight < 1:
seq_loss = self.seq_loss(
att_pred[:, :ans_len, :].contiguous().view(
-1, att_pred.shape[-1]), label.view(-1))
seq_loss = torch.sum(seq_loss.view(x.shape[0],-1),dim=-1)/torch.sum(y!=0,dim=-1)\
.to(device = self.device,dtype=torch.float32) # Sum each uttr and devide by length
seq_loss = torch.mean(seq_loss) # Mean by batch
val_att += seq_loss.detach() * int(x.shape[0])
t1, t2 = cal_cer(att_pred,
label,
mapper=self.mapper,
get_sentence=True)
all_pred += t1
all_true += t2
val_acc += cal_acc(att_pred, label) * int(x.shape[0])
val_cer += cal_cer(att_pred, label, mapper=self.mapper) * int(
x.shape[0])
# Compute CTC loss
if self.ctc_weight > 0:
target_len = torch.sum(y != 0, dim=-1)
ctc_loss = self.ctc_loss(
F.log_softmax(ctc_pred.transpose(0, 1), dim=-1), label,
torch.LongTensor(state_len), target_len)
val_ctc += ctc_loss.detach() * int(x.shape[0])
val_len += int(x.shape[0])
# Logger
val_loss = (1 - self.ctc_weight) * val_att + self.ctc_weight * val_ctc
loss_log = {}
for k, v in zip(['dev_full', 'dev_ctc', 'dev_att'],
[val_loss, val_ctc, val_att]):
if v > 0.0: loss_log[k] = v / val_len
self.write_log('loss', loss_log)
if self.ctc_weight < 1:
# Plot attention map to log
val_hyp, val_txt = cal_cer(att_pred,
label,
mapper=self.mapper,
get_sentence=True)
val_attmap = draw_att(att_maps, att_pred)
# Record loss
self.write_log('error rate', {'dev': val_cer / val_len})
self.write_log('acc', {'dev': val_acc / val_len})
for idx, attmap in enumerate(val_attmap):
self.write_log('att_' + str(idx), attmap)
self.write_log('hyp_' + str(idx), val_hyp[idx])
self.write_log('txt_' + str(idx), val_txt[idx])
# Save model by val er.
if val_cer / val_len < self.best_val_ed:
self.best_val_ed = val_cer / val_len
self.verbose(
'Best val er : {:.4f} @ step {}'.format(
self.best_val_ed, self.step))
torch.save(self.asr_model, os.path.join(self.ckpdir, 'asr'))
if self.apply_clm:
torch.save(self.clm.clm, os.path.join(self.ckpdir, 'clm'))
# Save hyps.
with open(os.path.join(self.ckpdir, 'best_hyp.txt'), 'w') as f:
for t1, t2 in zip(all_pred, all_true):
f.write(t1 + ',' + t2 + '\n')
self.asr_model.train()
def valid(self):
'''Perform validation step (!!!NOTE!!! greedy decoding with Attention decoder only)'''
self.asr_model.eval()
# Init stats
val_loss, val_ctc, val_att, val_acc, val_cer = 0.0, 0.0, 0.0, 0.0, 0.0
val_len = 0
all_pred, all_true = [],[]
progress_bar = tqdm(self.dev_set, leave=False)
# Perform validation
for cur_b,(x,y,state_len) in enumerate(progress_bar):
progress_bar.set_description("[valid {}/{}]".format(self.step, cur_b, len(self.dev_set)))
# Prepare data
if len(x.shape) == 4: x = x.squeeze(0)
if len(y.shape) == 3: y = y.squeeze(0)
if state_len.dim() == 2: state_len = state_len.squeeze(0)
x = x.to(device = self.device,dtype=torch.float32)
y = y.to(device = self.device,dtype=torch.long)
state_len = state_len.to(device = self.device,dtype=torch.long)
# state_len = torch.sum(torch.sum(x.cpu(),dim=-1) != 0,dim=-1)
# state_len = [int(sl) for sl in state_len]
ans_len = int(torch.max(torch.sum(y != 0, dim=-1)))
# Forward
ctc_pred, state_len, att_pred, att_maps = self.asr_model(x, ans_len+VAL_STEP,state_len=state_len)
# Compute attention loss & get decoding results
label = y[:,1:ans_len+1].contiguous()
if self.ctc_weight < 1:
seq_loss = self.seq_loss(att_pred[:,:ans_len,:].contiguous().view(-1,att_pred.shape[-1]),label.view(-1))
seq_loss = torch.sum(seq_loss.view(x.shape[0],-1),dim=-1)/torch.sum(y != 0, dim=-1)\
.to(device = self.device,dtype=torch.float32) # Sum each uttr and devide by length
seq_loss = torch.mean(seq_loss) # Mean by batch
val_att += seq_loss.detach()*int(x.shape[0])
t1,t2 = cal_cer(att_pred,label,mapper=self.mapper,get_sentence=True)
all_pred += t1
all_true += t2
val_acc += cal_acc(att_pred,label)*int(x.shape[0])
val_cer += cal_cer(att_pred,label,mapper=self.mapper)*int(x.shape[0])
else:
# only ctc
t1,t2 = cal_cer(ctc_pred,label,mapper=self.mapper,get_sentence=True)
all_pred += t1
all_true += t2
val_acc += cal_acc(ctc_pred,label)*int(x.shape[0])
val_cer += cal_cer(ctc_pred,label,mapper=self.mapper)*int(x.shape[0])
# Compute CTC loss
if self.ctc_weight > 0:
target_len = torch.sum(y != 0, dim=-1)
ctc_loss = self.ctc_loss(F.log_softmax( ctc_pred.transpose(0,1),dim=-1), label,
torch.LongTensor(state_len), target_len)
val_ctc += ctc_loss.detach()*int(x.shape[0])
val_len += int(x.shape[0])
# Logger
val_loss = (1-self.ctc_weight)*val_att + self.ctc_weight*val_ctc
loss_log = {}
for k,v in zip(['dev_full','dev_ctc','dev_att'],[val_loss, val_ctc, val_att]):
if v > 0.0: loss_log[k] = v/val_len
self.write_log('loss',loss_log)
# attention decoder
if self.ctc_weight < 1:
# Plot attention map to log
val_hyp,val_txt = cal_cer(att_pred,label,mapper=self.mapper,get_sentence=True)
val_attmap = draw_att(att_maps,att_pred)
# Record loss
self.write_log('error rate',{'dev':val_cer/val_len})
self.write_log('acc',{'dev':val_acc/val_len})
for idx,attmap in enumerate(val_attmap):
self.write_log('att_'+str(idx),attmap)
self.write_log('hyp_'+str(idx),val_hyp[idx])
self.write_log('txt_'+str(idx),val_txt[idx])
else:
# only use ctc
val_hyp, val_txt = cal_cer(ctc_pred, label,mapper=self.mapper,get_sentence=True)
# Record loss
self.write_log('ctc error rate',{'dev':val_cer/val_len})
self.write_log('ctc acc',{'dev':val_acc/val_len})
for idx in range(len(val_hyp)):
self.write_log('hyp_'+str(idx),val_hyp[idx])
self.write_log('txt_'+str(idx),val_txt[idx])
# Save model by val er.
self.maybe_dump_checkpoint(val_cer / val_len, all_pred, all_true)
self.asr_model.train()
def exec(self):
''' Training End-to-end ASR system'''
self.verbose('Training set total ' + str(len(self.train_set)) +
' batches.')
while self.step < self.max_step:
for x, y in self.train_set:
self.progress('Training step - ' + str(self.step))
# Perform teacher forcing rate decaying
tf_rate = self.tf_start - self.step * (
self.tf_start - self.tf_end) / self.max_step
# Hack bucket, record state length for each uttr, get longest label seq for decode step
assert len(
x.shape
) == 4, 'Bucketing should cause acoustic feature to have shape 1xBxTxD'
assert len(
y.shape
) == 3, 'Bucketing should cause label have to shape 1xBxT'
x = x.squeeze(0).to(device=self.device, dtype=torch.float32)
y = y.squeeze(0).to(device=self.device, dtype=torch.long)
state_len = np.sum(np.sum(x.cpu().data.numpy(), axis=-1) != 0,
axis=-1)
state_len = [int(sl) for sl in state_len]
ans_len = int(torch.max(torch.sum(y != 0, dim=-1)))
# ASR forwarding
self.asr_opt.zero_grad()
ctc_pred, state_len, att_pred, _ = self.asr_model(
x,
ans_len,
tf_rate=tf_rate,
teacher=y,
state_len=state_len)
# Calculate loss function
loss_log = {}
label = y[:, 1:ans_len + 1].contiguous()
ctc_loss = 0
att_loss = 0
# CE loss on attention decoder
if self.ctc_weight < 1:
b, t, c = att_pred.shape
att_loss = self.seq_loss(att_pred.view(b * t, c),
label.view(-1))
att_loss = torch.sum(att_loss.view(b,t),dim=-1)/torch.sum(y!=0,dim=-1)\
.to(device = self.device,dtype=torch.float32) # Sum each uttr and devide by length
att_loss = torch.mean(att_loss) # Mean by batch
loss_log['train_att'] = att_loss
# CTC loss on CTC decoder
if self.ctc_weight > 0:
target_len = torch.sum(y != 0, dim=-1)
ctc_loss = self.ctc_loss(
F.log_softmax(ctc_pred.transpose(0, 1), dim=-1), label,
torch.LongTensor(state_len), target_len)
loss_log['train_ctc'] = ctc_loss
asr_loss = (1 - self.ctc_weight
) * att_loss + self.ctc_weight * ctc_loss
loss_log['train_full'] = asr_loss
# Adversarial loss from CLM
if self.apply_clm and att_pred.shape[1] >= CLM_MIN_SEQ_LEN:
if (self.step % self.clm.update_freq) == 0:
# update CLM once in a while
clm_log, gp = self.clm.train(att_pred.detach(),
CLM_MIN_SEQ_LEN)
self.write_log('clm_score', clm_log)
self.write_log('clm_gp', gp)
adv_feedback = self.clm.compute_loss(F.softmax(att_pred))
asr_loss -= adv_feedback
# Backprop
asr_loss.backward()
grad_norm = torch.nn.utils.clip_grad_norm_(
self.asr_model.parameters(), GRAD_CLIP)
if math.isnan(grad_norm):
self.verbose('Error : grad norm is NaN @ step ' +
str(self.step))
else:
self.asr_opt.step()
# Logger
self.write_log('loss', loss_log)
if self.ctc_weight < 1:
self.write_log('acc', {'train': cal_acc(att_pred, label)})
if self.step % TRAIN_WER_STEP == 0:
self.write_log('error rate', {
'train':
cal_cer(att_pred, label, mapper=self.mapper)
})
# Validation
if self.step % self.valid_step == 0:
self.asr_opt.zero_grad()
self.valid()
self.step += 1
if self.step > self.max_step: break
def exec(self):
''' Training End-to-end ASR system'''
self.verbose('Training set total '+str(len(self.train_set))+' batches.')
progress_bar = tqdm(range(self.max_step))
while self.step < self.max_step:
for x,y,state_len in self.train_set:
progress_bar.set_description("[training {}]".format(self.step))
# Perform teacher forcing rate decaying
tf_rate = self.tf_start - self.step*(self.tf_start-self.tf_end)/self.max_step
# Hack bucket, record state length for each uttr, get longest label seq for decode step
assert len(x.shape) == 4,'Bucketing should cause acoustic feature to have shape 1xBxTxD'
assert len(y.shape) == 3,'Bucketing should cause label have to shape 1xBxT'
x = x.squeeze(0).to(device = self.device,dtype=torch.float32)
y = y.squeeze(0).to(device = self.device,dtype=torch.long)
state_len = state_len.squeeze(0).to(device = self.device,dtype=torch.long)
# state_len = np.sum(np.sum(x.cpu().data.numpy(),axis=-1) != 0,axis=-1)
# state_len = [int(sl) for sl in state_len]
ans_len = int(torch.max(torch.sum(y != 0, dim=-1)))
# ASR forwarding
self.asr_opt.zero_grad()
ctc_pred, state_len, att_pred, _ = self.asr_model(
x, ans_len,
tf_rate=tf_rate,
teacher=y,
state_len=state_len
)
# print()
# print("inp", x.shape[1] // self.asr_model.encoder.downsample_rate)
# print("ctc", ctc_pred.shape[1] if ctc_pred is not None else 0)
# print("att", att_pred.shape[1] if att_pred is not None else 0)
assert ctc_pred is not None, "for saber, must use ctc_pred!"
assert x.shape[1] // self.asr_model.encoder.downsample_rate == ctc_pred.shape[1]
# Calculate loss function
loss_log = {}
label = y[:,1:ans_len+1].contiguous()
ctc_loss = 0
att_loss = 0
# CE loss on attention decoder
if self.ctc_weight < 1:
b,t,c = att_pred.shape
att_loss = self.seq_loss(att_pred.view(b*t,c),label.view(-1))
att_loss = torch.sum(att_loss.view(b,t),dim=-1)/torch.sum(y != 0, dim=-1)\
.to(device = self.device,dtype=torch.float32) # Sum each uttr and devide by length
att_loss = torch.mean(att_loss) # Mean by batch
loss_log['train_att'] = att_loss
# CTC loss on CTC decoder
if self.ctc_weight > 0:
target_len = torch.sum(y != 0, dim=-1)
ctc_loss = self.ctc_loss(
F.log_softmax(ctc_pred.transpose(0,1), dim=-1), label,
torch.LongTensor(state_len), target_len
)
loss_log['train_ctc'] = ctc_loss
asr_loss = (1-self.ctc_weight)*att_loss+self.ctc_weight*ctc_loss
loss_log['train_full'] = asr_loss
# Adversarial loss from CLM
if (
self.apply_clm and
(att_pred is not None) and
(att_pred.shape[1] >= CLM_MIN_SEQ_LEN)
):
if (self.step % self.clm.update_freq) == 0:
# update CLM once in a while
clm_log,gp = self.clm.train(att_pred.detach(),CLM_MIN_SEQ_LEN)
self.write_log('clm_score',clm_log)
self.write_log('clm_gp',gp)
adv_feedback = self.clm.compute_loss(F.softmax(att_pred))
asr_loss -= adv_feedback
# Backprop
asr_loss.backward()
grad_norm = torch.nn.utils.clip_grad_norm_(self.asr_model.parameters(), GRAD_CLIP)
if math.isnan(grad_norm):
self.verbose('Error : grad norm is NaN @ step '+str(self.step))
else:
self.asr_opt.step()
# Logger
self.write_log('loss',loss_log)
if self.ctc_weight < 1:
self.write_log('acc', {'train':cal_acc(att_pred,label)})
if self.step % TRAIN_WER_STEP == 0:
self.write_log('error rate', {'train':cal_cer(att_pred,label,mapper=self.mapper)})
else:
# only ctc
self.write_log('ctc acc', {'train':cal_acc(ctc_pred,label)})
if self.step % TRAIN_WER_STEP == 0:
self.write_log('ctc error rate', {'train':cal_cer(ctc_pred,label,mapper=self.mapper)})
# visualize inputs
if self.step % 1000 == 0:
example_inputs = x[0].cpu().detach().numpy().transpose(1, 0)
img = visualizer.plot(visualizer.plot_item(example_inputs, "inputs-feature"))
self.log.add_image("0-inputs", img, global_step=self.step, dataformats="HWC")
# Validation
if self.step % self.valid_step == 0:
self.asr_opt.zero_grad()
self.valid()
self.step += 1
progress_bar.update()
if self.step > self.max_step:break