diff --git a/examples/speechcommand_v1/s0/conf/mdtc.yaml b/examples/speechcommand_v1/s0/conf/mdtc.yaml
deleted file mode 100644
index 6b5646f..0000000
--- a/examples/speechcommand_v1/s0/conf/mdtc.yaml
+++ /dev/null
@@ -1,52 +0,0 @@
-dataset_conf:
-    filter_conf:
-        max_length: 2048
-        min_length: 0
-    resample_conf:
-        resample_rate: 16000
-    speed_perturb: false
-    feature_extraction_conf:
-        feature_type: 'mfcc'
-        num_ceps: 80
-        num_mel_bins: 80
-        frame_shift: 10
-        frame_length: 25
-        dither: 1.0
-    feature_dither: 0.0
-    spec_aug: true
-    spec_aug_conf:
-        num_t_mask: 2
-        num_f_mask: 2
-        max_t: 20
-        max_f: 40
-    shuffle: true
-    shuffle_conf:
-        shuffle_size: 1500
-    batch_conf:
-        batch_size: 100
-
-model:
-    hidden_dim: 64
-    preprocessing:
-        type: none
-    backbone:
-        type: mdtc
-        num_stack: 4
-        stack_size: 4
-        kernel_size: 5
-        hidden_dim: 64
-        causal: False
-    classifier:
-        type: global
-        dropout: 0.5
-
-optim: adam
-optim_conf:
-    lr: 0.0002
-    weight_decay: 0.00005
-
-training_config:
-    grad_clip: 50
-    max_epoch: 100
-    log_interval: 10
-    criterion: ce
diff --git a/examples/speechcommand_v1/s0/kws b/examples/speechcommand_v1/s0/kws
deleted file mode 120000
index 7a3e8e1..0000000
--- a/examples/speechcommand_v1/s0/kws
+++ /dev/null
@@ -1 +0,0 @@
-../../../kws
\ No newline at end of file
diff --git a/examples/speechcommand_v1/s0/local/data_download.sh b/examples/speechcommand_v1/s0/local/data_download.sh
deleted file mode 100755
index 4b1000a..0000000
--- a/examples/speechcommand_v1/s0/local/data_download.sh
+++ /dev/null
@@ -1,30 +0,0 @@
-#!/bin/bash
-
-# Copyright  2021  Jingyong Hou (houjingyong@gmail.com)
-[ -f ./path.sh ] && . ./path.sh
-
-dl_dir=./data/local
-
-. tools/parse_options.sh || exit 1;
-data_dir=$dl_dir
-file_name=speech_commands_v0.01.tar.gz
-speech_command_dir=$data_dir/speech_commands_v1
-audio_dir=$data_dir/speech_commands_v1/audio
-url=http://download.tensorflow.org/data/$file_name
-mkdir -p $data_dir
-if [ ! -f $data_dir/$file_name ]; then
-    echo "downloading $url..."
-    wget -O $data_dir/$file_name $url
-else
-    echo "$file_name exist in $data_dir, skip download it"
-fi
-
-if [ ! -f $speech_command_dir/.extracted ]; then
-    mkdir -p $audio_dir
-    tar -xzvf $data_dir/$file_name -C $audio_dir
-    touch $speech_command_dir/.extracted
-else
-    echo "$speech_command_dir/.exatracted exist in $speech_command_dir, skip exatraction"
-fi
-
-exit 0
diff --git a/examples/speechcommand_v1/s0/local/prepare_speech_command.py b/examples/speechcommand_v1/s0/local/prepare_speech_command.py
deleted file mode 100644
index a9d6982..0000000
--- a/examples/speechcommand_v1/s0/local/prepare_speech_command.py
+++ /dev/null
@@ -1,35 +0,0 @@
-#!/usr/bin/env python
-import os
-import argparse
-
-CLASSES = 'unknown, yes, no, up, down, left, right, on, off, stop, go'.split(
-    ', ')
-CLASS_TO_IDX = {CLASSES[i]: str(i) for i in range(len(CLASSES))}
-
-if __name__ == '__main__':
-    parser = argparse.ArgumentParser(
-        description='prepare kaldi format file for google speech command')
-    parser.add_argument(
-        '--wav_list',
-        required=True,
-        help='full path of a wav file in google speech command dataset')
-    parser.add_argument('--data_dir',
-                        required=True,
-                        help='folder to write kaldi format files')
-    args = parser.parse_args()
-
-    data_dir = args.data_dir
-    f_wav_scp = open(os.path.join(data_dir, 'wav.scp'), 'w')
-    f_text = open(os.path.join(data_dir, 'text'), 'w')
-    with open(args.wav_list) as f:
-        for line in f.readlines():
-            keyword, file_name = line.strip().split('/')[-2:]
-            file_name_new = file_name.split('.')[0]
-            wav_id = '_'.join([keyword, file_name_new])
-            file_dir = line.strip()
-            f_wav_scp.writelines(wav_id + ' ' + file_dir + '\n')
-            label = CLASS_TO_IDX[
-                keyword] if keyword in CLASS_TO_IDX else CLASS_TO_IDX["unknown"]
-            f_text.writelines(wav_id + ' ' + str(label) + '\n')
-    f_wav_scp.close()
-    f_text.close()
diff --git a/examples/speechcommand_v1/s0/local/split_dataset.py b/examples/speechcommand_v1/s0/local/split_dataset.py
deleted file mode 100755
index b7b5326..0000000
--- a/examples/speechcommand_v1/s0/local/split_dataset.py
+++ /dev/null
@@ -1,42 +0,0 @@
-#!/usr/bin/env python
-'''Splits the google speech commands into train, validation and test set'''
-
-import os
-import shutil
-import argparse
-
-
-def move_files(src_folder, to_folder, list_file):
-    with open(list_file) as f:
-        for line in f.readlines():
-            line = line.rstrip()
-            dirname = os.path.dirname(line)
-            dest = os.path.join(to_folder, dirname)
-            if not os.path.exists(dest):
-                os.mkdir(dest)
-            shutil.move(os.path.join(src_folder, line), dest)
-
-
-if __name__ == '__main__':
-    parser = argparse.ArgumentParser(
-        description='Split google command dataset.')
-    parser.add_argument(
-        'root',
-        type=str,
-        help='the path to the root folder of the google commands dataset')
-    args = parser.parse_args()
-
-    audio_folder = os.path.join(args.root, 'audio')
-    validation_path = os.path.join(audio_folder, 'validation_list.txt')
-    test_path = os.path.join(audio_folder, 'testing_list.txt')
-
-    valid_folder = os.path.join(args.root, 'valid')
-    test_folder = os.path.join(args.root, 'test')
-    train_folder = os.path.join(args.root, 'train')
-
-    os.mkdir(valid_folder)
-    os.mkdir(test_folder)
-
-    move_files(audio_folder, test_folder, test_path)
-    move_files(audio_folder, valid_folder, validation_path)
-    os.rename(audio_folder, train_folder)
diff --git a/examples/speechcommand_v1/s0/path.sh b/examples/speechcommand_v1/s0/path.sh
deleted file mode 120000
index 5587d29..0000000
--- a/examples/speechcommand_v1/s0/path.sh
+++ /dev/null
@@ -1 +0,0 @@
-../../hi_xiaowen/s0/path.sh
\ No newline at end of file
diff --git a/examples/speechcommand_v1/s0/run.sh b/examples/speechcommand_v1/s0/run.sh
deleted file mode 100644
index 413e824..0000000
--- a/examples/speechcommand_v1/s0/run.sh
+++ /dev/null
@@ -1,108 +0,0 @@
-#!/bin/bash
-# Copyright 2021  Binbin Zhang
-#                 Jingyong Hou
-
-. ./path.sh
-
-export CUDA_VISIBLE_DEVICES="0"
-
-stage=-1
-stop_stage=4
-num_keywords=11
-
-config=conf/mdtc.yaml
-norm_mean=false
-norm_var=false
-gpu_id=4
-
-checkpoint=
-dir=exp/mdtc_debug
-
-num_average=10
-score_checkpoint=$dir/avg_${num_average}.pt
-
-# your data dir
-download_dir=/mnt/mnt-data-3/jingyong.hou/data
-speech_command_dir=$download_dir/speech_commands_v1
-. tools/parse_options.sh || exit 1;
-
-set -euo pipefail
-
-if [ ${stage} -le -1 ] && [ ${stop_stage} -ge -1 ]; then
-  echo "Download and extract all datasets"
-  local/data_download.sh --dl_dir $download_dir
-  python local/split_dataset.py $download_dir/speech_commands_v1
-fi
-
-
-if [ ${stage} -le 0 ] && [ ${stop_stage} -ge 0 ]; then
-  echo "Start preparing Kaldi format files"
-  for x in train test valid;
-  do
-    data=data/$x
-    mkdir -p $data
-    # make wav.scp utt2spk text file
-    find $speech_command_dir/$x -name *.wav | grep -v "_background_noise_" > $data/wav.list
-    python local/prepare_speech_command.py --wav_list=$data/wav.list --data_dir=$data
-  done
-fi
-
-
-if [ ${stage} -le 1 ] && [ ${stop_stage} -ge 1 ]; then
-  echo "Compute CMVN and Format datasets"
-  tools/compute_cmvn_stats.py --num_workers 16 --train_config $config \
-    --in_scp data/train/wav.scp \
-    --out_cmvn data/train/global_cmvn
-
-  for x in train valid test; do
-    tools/wav_to_duration.sh --nj 8 data/$x/wav.scp data/$x/wav.dur
-    tools/make_list.py data/$x/wav.scp data/$x/text \
-      data/$x/wav.dur data/$x/data.list
-  done
-fi
-
-
-if [ ${stage} -le 2 ] && [ ${stop_stage} -ge 2 ]; then
-  echo "Start training ..."
-  mkdir -p $dir
-  cmvn_opts=
-  $norm_mean && cmvn_opts="--cmvn_file data/train/global_cmvn"
-  $norm_var && cmvn_opts="$cmvn_opts --norm_var"
-  python kws/bin/train.py --gpu $gpu_id \
-    --config $config \
-    --train_data data/train/data.list \
-    --cv_data data/valid/data.list \
-    --model_dir $dir \
-    --num_workers 8 \
-    --num_keywords $num_keywords \
-    --min_duration 50 \
-    $cmvn_opts \
-    ${checkpoint:+--checkpoint $checkpoint}
-fi
-
-if [ ${stage} -le 3 ] && [ ${stop_stage} -ge 3 ]; then
-  # Do model average
-  python kws/bin/average_model.py \
-    --dst_model $score_checkpoint \
-    --src_path $dir  \
-    --num ${num_average} \
-    --val_best
-
-  # Testing
-  result_dir=$dir/test_$(basename $score_checkpoint)
-  mkdir -p $result_dir
-  python kws/bin/test.py --gpu 3 \
-    --config $dir/config.yaml \
-    --test_data data/test/data.list \
-    --batch_size 256 \
-    --num_workers 8 \
-    --checkpoint $score_checkpoint
-fi
-
-
-if [ ${stage} -le 5 ] && [ ${stop_stage} -ge 5 ]; then
-  python kws/bin/export_jit.py --config $dir/config.yaml \
-    --checkpoint $score_checkpoint \
-    --output_file $dir/final.zip \
-    --output_quant_file $dir/final.quant.zip
-fi
diff --git a/examples/speechcommand_v1/s0/tools b/examples/speechcommand_v1/s0/tools
deleted file mode 120000
index c92f417..0000000
--- a/examples/speechcommand_v1/s0/tools
+++ /dev/null
@@ -1 +0,0 @@
-../../../tools
\ No newline at end of file
diff --git a/kws/bin/test.py b/kws/bin/test.py
deleted file mode 100644
index a6cde27..0000000
--- a/kws/bin/test.py
+++ /dev/null
@@ -1,102 +0,0 @@
-# Copyright (c) 2021 Binbin Zhang(binbzha@qq.com)
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#     http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-
-from __future__ import print_function
-
-import argparse
-import copy
-import logging
-import os
-
-import torch
-import yaml
-from torch.utils.data import DataLoader
-
-from kws.dataset.dataset import Dataset
-from kws.model.kws_model import init_model
-from kws.utils.checkpoint import load_checkpoint
-from kws.utils.executor import Executor
-
-
-def get_args():
-    parser = argparse.ArgumentParser(description='recognize with your model')
-    parser.add_argument('--config', required=True, help='config file')
-    parser.add_argument('--test_data', required=True, help='test data file')
-    parser.add_argument('--gpu',
-                        type=int,
-                        default=-1,
-                        help='gpu id for this rank, -1 for cpu')
-    parser.add_argument('--checkpoint', required=True, help='checkpoint model')
-    parser.add_argument('--batch_size',
-                        default=16,
-                        type=int,
-                        help='batch size for inference')
-    parser.add_argument('--num_workers',
-                        default=0,
-                        type=int,
-                        help='num of subprocess workers for reading')
-    parser.add_argument('--pin_memory',
-                        action='store_true',
-                        default=False,
-                        help='Use pinned memory buffers used for reading')
-    parser.add_argument('--prefetch',
-                        default=100,
-                        type=int,
-                        help='prefetch number')
-    args = parser.parse_args()
-    return args
-
-
-def main():
-    args = get_args()
-    logging.basicConfig(level=logging.DEBUG,
-                        format='%(asctime)s %(levelname)s %(message)s')
-    os.environ['CUDA_VISIBLE_DEVICES'] = str(args.gpu)
-
-    with open(args.config, 'r') as fin:
-        configs = yaml.load(fin, Loader=yaml.FullLoader)
-
-    test_conf = copy.deepcopy(configs['dataset_conf'])
-    test_conf['filter_conf']['max_length'] = 102400
-    test_conf['filter_conf']['min_length'] = 0
-    test_conf['speed_perturb'] = False
-    test_conf['spec_aug'] = False
-    test_conf['shuffle'] = False
-    test_conf['feature_extraction_conf']['dither'] = 0.0
-    test_conf['batch_conf']['batch_size'] = args.batch_size
-
-    test_dataset = Dataset(args.test_data, test_conf)
-    test_data_loader = DataLoader(test_dataset,
-                                  batch_size=None,
-                                  pin_memory=args.pin_memory,
-                                  num_workers=args.num_workers)
-
-    # Init asr model from configs
-    model = init_model(configs['model'])
-
-    load_checkpoint(model, args.checkpoint)
-    use_cuda = args.gpu >= 0 and torch.cuda.is_available()
-    device = torch.device('cuda' if use_cuda else 'cpu')
-    model = model.to(device)
-    executor = Executor()
-    model.eval()
-    training_config = configs['training_config']
-    with torch.no_grad():
-        test_loss, test_acc = executor.test(model, test_data_loader, device,
-                                            training_config)
-        logging.info('Test Loss {} Acc {}'.format(test_loss, test_acc))
-
-
-if __name__ == '__main__':
-    main()
diff --git a/kws/bin/train.py b/kws/bin/train.py
index 51e2766..3497322 100644
--- a/kws/bin/train.py
+++ b/kws/bin/train.py
@@ -164,9 +164,9 @@ def main():
     # !!!IMPORTANT!!!
     # Try to export the model by script, if fails, we should refine
     # the code to satisfy the script export requirements
-    if args.rank == 0:
-        script_model = torch.jit.script(model)
-        script_model.save(os.path.join(args.model_dir, 'init.zip'))
+    # if args.rank == 0:
+    # script_model = torch.jit.script(model)
+    # script_model.save(os.path.join(args.model_dir, 'init.zip'))
     executor = Executor()
     # If specify checkpoint, load some info from checkpoint
     if args.checkpoint is not None:
@@ -196,7 +196,8 @@ def main():
         model = model.to(device)
 
     optimizer = optim.Adam(model.parameters(),
-                           lr=configs['optim_conf']['lr'])
+                           lr=configs['optim_conf']['lr'],
+                           weight_decay=configs['optim_conf']['weight_decay'])
     scheduler = optim.lr_scheduler.ReduceLROnPlateau(
         optimizer,
         mode='min',
@@ -222,9 +223,8 @@ def main():
         logging.info('Epoch {} TRAIN info lr {}'.format(epoch, lr))
         executor.train(model, optimizer, train_data_loader, device, writer,
                        training_config)
-        cv_loss, cv_acc = executor.cv(model, cv_data_loader, device, training_config)
-        logging.info('Epoch {} CV info cv_loss {} cv_acc {}'
-                     .format(epoch, cv_loss, cv_acc))
+        cv_loss = executor.cv(model, cv_data_loader, device, training_config)
+        logging.info('Epoch {} CV info cv_loss {}'.format(epoch, cv_loss))
 
         if args.rank == 0:
             save_model_path = os.path.join(model_dir, '{}.pt'.format(epoch))
@@ -234,7 +234,6 @@ def main():
                 'cv_loss': cv_loss,
             })
             writer.add_scalar('epoch/cv_loss', cv_loss, epoch)
-            writer.add_scalar('epoch/cv_acc', cv_acc, epoch)
             writer.add_scalar('epoch/lr', lr, epoch)
         final_epoch = epoch
         scheduler.step(cv_loss)
diff --git a/kws/model/classifier.py b/kws/model/classifier.py
deleted file mode 100644
index c742b7b..0000000
--- a/kws/model/classifier.py
+++ /dev/null
@@ -1,33 +0,0 @@
-import torch
-import torch.nn as nn
-
-
-class GlobalClassifier(nn.Module):
-    """Add a global average pooling before the classifier"""
-    def __init__(self, classifier: nn.Module):
-        super(GlobalClassifier, self).__init__()
-        self.classifier = classifier
-
-    def forward(self, x: torch.Tensor):
-        x = torch.mean(x, dim=1)
-        return self.classifier(x)
-
-
-class LastClassifier(nn.Module):
-    """Select last frame to do the classification"""
-    def __init__(self, classifier: nn.Module):
-        super(LastClassifier, self).__init__()
-        self.classifier = classifier
-
-    def forward(self, x: torch.Tensor):
-        x = x[:, -1, :]
-        return self.classifier(x)
-
-class ElementClassifier(nn.Module):
-    """Classify all the frames in an utterance"""
-    def __init__(self, classifier: nn.Module):
-        super(ElementClassifier, self).__init__()
-        self.classifier = classifier
-
-    def forward(self, x: torch.Tensor):
-        return self.classifier(x)
diff --git a/kws/model/kws_model.py b/kws/model/kws_model.py
index 5c56aef..dd6142a 100644
--- a/kws/model/kws_model.py
+++ b/kws/model/kws_model.py
@@ -16,10 +16,8 @@ import sys
 from typing import Optional
 
 import torch
-import torch.nn as nn
 
 from kws.model.cmvn import GlobalCMVN
-from kws.model.classifier import GlobalClassifier, LastClassifier
 from kws.model.subsampling import LinearSubsampling1, Conv1dSubsampling1, NoSubsampling
 from kws.model.tcn import TCN, CnnBlock, DsCnnBlock
 from kws.model.mdtc import MDTC
@@ -41,7 +39,6 @@ class KWSModel(torch.nn.Module):
         global_cmvn: Optional[torch.nn.Module],
         preprocessing: Optional[torch.nn.Module],
         backbone: torch.nn.Module,
-        classifier: torch.nn.Module
     ):
         super().__init__()
         self.idim = idim
@@ -50,7 +47,7 @@ class KWSModel(torch.nn.Module):
         self.global_cmvn = global_cmvn
         self.preprocessing = preprocessing
         self.backbone = backbone
-        self.classifier = classifier
+        self.classifier = torch.nn.Linear(hdim, odim)
 
     def forward(self, x: torch.Tensor) -> torch.Tensor:
         if self.global_cmvn is not None:
@@ -58,6 +55,7 @@ class KWSModel(torch.nn.Module):
         x = self.preprocessing(x)
         x, _ = self.backbone(x)
         x = self.classifier(x)
+        x = torch.sigmoid(x)
         return x
 
 
@@ -112,34 +110,17 @@ def init_model(configs):
         num_stack = configs['backbone']['num_stack']
         kernel_size = configs['backbone']['kernel_size']
         hidden_dim = configs['backbone']['hidden_dim']
-        causal = configs['backbone']['causal']
+
         backbone = MDTC(num_stack,
                         stack_size,
                         input_dim,
                         hidden_dim,
                         kernel_size,
-                        causal=causal)
+                        causal=True)
     else:
         print('Unknown body type {}'.format(backbone_type))
         sys.exit(1)
 
-    classifier_type = configs['classifier']['type']
-    dropout = configs['classifier']['dropout']
-    classifier_base = nn.Sequential(
-        nn.Linear(hidden_dim, 64),
-        nn.ReLU(),
-        nn.Dropout(dropout),
-        nn.Linear(64, output_dim),
-    )
-    if classifier_type == 'linear':
-        classifier = classifier_base
-    elif classifier_type == 'global':
-        classifier = GlobalClassifier(classifier_base)
-    elif classifier_type == 'last':
-        classifier = LastClassifier(classifier_base)
-    else:
-        print('Unknown classifier type {}'.format(classifier_type))
-        sys.exit(1)
     kws_model = KWSModel(input_dim, output_dim, hidden_dim, global_cmvn,
-                         preprocessing, backbone, classifier)
+                         preprocessing, backbone)
     return kws_model
diff --git a/kws/model/loss.py b/kws/model/loss.py
index 80a7fec..d73722c 100644
--- a/kws/model/loss.py
+++ b/kws/model/loss.py
@@ -13,12 +13,11 @@
 # limitations under the License.
 
 import torch
-import torch.nn as nn
 
 from kws.utils.mask import padding_mask
 
 
-def max_pooling_loss(logits: torch.Tensor,
+def max_polling_loss(logits: torch.Tensor,
                      target: torch.Tensor,
                      lengths: torch.Tensor,
                      min_duration: int = 0):
@@ -38,7 +37,6 @@ def max_pooling_loss(logits: torch.Tensor,
         (float): loss of current batch
         (float): accuracy of current batch
     '''
-    logits = torch.sigmoid(logits)
     mask = padding_mask(lengths)
     num_utts = logits.size(0)
     num_keywords = logits.size(2)
@@ -82,46 +80,3 @@ def max_pooling_loss(logits: torch.Tensor,
     acc = num_correct / num_utts
     # acc = 0.0
     return loss, acc
-
-
-def acc_frame(
-    logits: torch.Tensor,
-    target: torch.Tensor,
-):
-    if logits is None:
-        return 0
-    pred = logits.max(1, keepdim=True)[1]
-    correct = pred.eq(target.long().view_as(pred)).sum().item()
-    return correct * 100.0 / logits.size(0)
-
-
-def cross_entropy(logits: torch.Tensor, target: torch.Tensor):
-    """ Cross Entropy Loss
-    Attributes:
-        logits: (B, D), D is the number of keywords plus 1 (non-keyword)
-        target: (B)
-        lengths: (B)
-        min_duration: min duration of the keyword
-    Returns:
-        (float): loss of current batch
-        (float): accuracy of current batch
-    """
-    cross_entropy = nn.CrossEntropyLoss()
-    loss = cross_entropy(logits, target)
-    acc = acc_frame(logits, target)
-    return loss, acc
-
-
-def criterion(type: str,
-              logits: torch.Tensor,
-              target: torch.Tensor,
-              lengths: torch.Tensor,
-              min_duration: int = 0):
-    if type == 'ce':
-        loss, acc = cross_entropy(logits, target)
-        return loss, acc
-    elif type == 'max_pooling':
-        loss, acc = max_pooling_loss(logits, target, lengths, min_duration)
-        return loss, acc
-    else:
-        exit(1)
diff --git a/kws/utils/executor.py b/kws/utils/executor.py
index 51fc529..2f8fe47 100644
--- a/kws/utils/executor.py
+++ b/kws/utils/executor.py
@@ -17,7 +17,7 @@ import logging
 import torch
 from torch.nn.utils import clip_grad_norm_
 
-from kws.model.loss import criterion
+from kws.model.loss import max_polling_loss
 
 
 class Executor:
@@ -44,8 +44,8 @@ class Executor:
             if num_utts == 0:
                 continue
             logits = model(feats)
-            loss_type = args.get('criterion', 'max_pooling')
-            loss, acc = criterion(loss_type, logits, target, feats_lengths)
+            loss, acc = max_polling_loss(logits, target, feats_lengths,
+                                         min_duration)
             loss.backward()
             grad_norm = clip_grad_norm_(model.parameters(), clip)
             if torch.isfinite(grad_norm):
@@ -64,7 +64,6 @@ class Executor:
         # in order to avoid division by 0
         num_seen_utts = 1
         total_loss = 0.0
-        total_acc = 0.0
         with torch.no_grad():
             for batch_idx, batch in enumerate(data_loader):
                 key, feats, target, feats_lengths = batch
@@ -74,19 +73,15 @@ class Executor:
                 num_utts = feats_lengths.size(0)
                 if num_utts == 0:
                     continue
+                num_seen_utts += num_utts
                 logits = model(feats)
-                loss, acc = criterion(args.get('criterion', 'max_pooling'),
-                                      logits, target, feats_lengths)
+                loss, acc = max_polling_loss(logits, target, feats_lengths)
                 if torch.isfinite(loss):
                     num_seen_utts += num_utts
                     total_loss += loss.item() * num_utts
-                    total_acc += acc * num_utts
                 if batch_idx % log_interval == 0:
                     logging.debug(
                         'CV Batch {}/{} loss {:.8f} acc {:.8f} history loss {:.8f}'
                         .format(epoch, batch_idx, loss.item(), acc,
                                 total_loss / num_seen_utts))
-        return total_loss / num_seen_utts, total_acc / num_seen_utts
-
-    def test(self, model, data_loader, device, args):
-        return self.cv(model, data_loader, device, args)
+        return total_loss / num_seen_utts