!3421 Add WarpCTC GPU script

Merge pull request !3421 from yangyongjie/master

model_zoo/official/cv/warpctc/README.md

@@ -31,7 +31,8 @@ These is an example of training Warpctc with self-generated captcha image datase
 └──warpct
   ├── README.md
   ├── script
-    ├── run_distribute_train.sh         # launch distributed training(8 pcs)
+    ├── run_distribute_train.sh         # launch distributed training in Ascend(8 pcs)
+    ├── run_distribute_train_for_gpu.sh # launch distributed training in GPU
     ├── run_eval.sh                     # launch evaluation
     ├── run_process_data.sh             # launch dataset generation
     └── run_standalone_train.sh         # launch standalone training(1 pcs)
@@ -75,22 +76,31 @@ Parameters for both training and evaluation can be set in config.py.
 #### Usage
 
 ```
-# distributed training
+# distributed training in Ascend
 Usage: sh run_distribute_train.sh [MINDSPORE_HCCL_CONFIG_PATH] [DATASET_PATH]
 
+# distributed training in GPU
+Usage: sh run_distribute_train_for_gpu.sh [RANK_SIZE] [DATASET_PATH]
+
 # standalone training
-Usage: sh run_standalone_train.sh [DATASET_PATH]  
+Usage: sh run_standalone_train.sh [DATASET_PATH] [PLATFORM]
 ```
 
 
 #### Launch
 
 ```
-# distribute training example
+# distribute training example in Ascend
 sh run_distribute_train.sh rank_table.json ../data/train
 
-# standalone training example
-sh run_standalone_train.sh ../data/train
+# distribute training example in GPU
+sh run_distribute_train.sh 8 ../data/train
+
+# standalone training example in Ascend
+sh run_standalone_train.sh ../data/train Ascend
+
+# standalone training example in GPU
+sh run_standalone_train.sh ../data/train GPU
 ```
 
 > About rank_table.json, you can refer to the [distributed training tutorial](https://www.mindspore.cn/tutorial/en/master/advanced_use/distributed_training.html).
@@ -116,14 +126,17 @@ Epoch: [  5/ 30], step: [   98/   98], loss: [0.0186/0.0186], time: [75199.5809]
 
 ```
 # evaluation
-Usage: sh run_eval.sh [DATASET_PATH] [CHECKPOINT_PATH]
+Usage: sh run_eval.sh [DATASET_PATH] [CHECKPOINT_PATH] [PLATFORM]
 ```
 
 #### Launch
 
 ```
-# evaluation example
-sh run_eval.sh ../data/test warpctc-30-98.ckpt
+# evaluation example in Ascend
+sh run_eval.sh ../data/test warpctc-30-98.ckpt Ascend
+
+# evaluation example in GPU
+sh run_eval.sh ../data/test warpctc-30-98.ckpt GPU
 ```
 
 > checkpoint can be produced in training process.

model_zoo/official/cv/warpctc/eval.py

@@ -23,10 +23,10 @@ from mindspore import dataset as de
 from mindspore.train.model import Model
 from mindspore.train.serialization import load_checkpoint, load_param_into_net
 
-from src.loss import CTCLoss
+from src.loss import CTCLoss, CTCLossV2
 from src.config import config as cf
 from src.dataset import create_dataset
-from src.warpctc import StackedRNN
+from src.warpctc import StackedRNN, StackedRNNForGPU
 from src.metric import WarpCTCAccuracy
 
 random.seed(1)
@@ -36,30 +36,38 @@ de.config.set_seed(1)
 parser = argparse.ArgumentParser(description="Warpctc training")
 parser.add_argument("--dataset_path", type=str, default=None, help="Dataset, default is None.")
 parser.add_argument("--checkpoint_path", type=str, default=None, help="checkpoint file path, default is None")
+parser.add_argument('--platform', type=str, default='Ascend', choices=['Ascend', 'GPU'],
+                    help='Running platform, choose from Ascend, GPU, and default is Ascend.')
 args_opt = parser.parse_args()
 
+context.set_context(mode=context.GRAPH_MODE, device_target=args_opt.platform, save_graphs=False)
+if args_opt.platform == 'Ascend':
     device_id = int(os.getenv('DEVICE_ID'))
-context.set_context(mode=context.GRAPH_MODE,
-                    device_target="Ascend",
-                    save_graphs=False,
-                    device_id=device_id)
+    context.set_context(device_id=device_id)
 
 if __name__ == '__main__':
     max_captcha_digits = cf.max_captcha_digits
     input_size = m.ceil(cf.captcha_height / 64) * 64 * 3
     # create dataset
-    dataset = create_dataset(dataset_path=args_opt.dataset_path, repeat_num=1, batch_size=cf.batch_size)
+    dataset = create_dataset(dataset_path=args_opt.dataset_path,
+                             batch_size=cf.batch_size,
+                             device_target=args_opt.platform)
     step_size = dataset.get_dataset_size()
-    # define loss
-    loss = CTCLoss(max_sequence_length=cf.captcha_width, max_label_length=max_captcha_digits, batch_size=cf.batch_size)
-    # define net
+    if args_opt.platform == 'Ascend':
+        loss = CTCLoss(max_sequence_length=cf.captcha_width,
+                       max_label_length=max_captcha_digits,
+                       batch_size=cf.batch_size)
         net = StackedRNN(input_size=input_size, batch_size=cf.batch_size, hidden_size=cf.hidden_size)
+    else:
+        loss = CTCLossV2(max_sequence_length=cf.captcha_width, batch_size=cf.batch_size)
+        net = StackedRNNForGPU(input_size=input_size, batch_size=cf.batch_size, hidden_size=cf.hidden_size)
+
     # load checkpoint
     param_dict = load_checkpoint(args_opt.checkpoint_path)
     load_param_into_net(net, param_dict)
     net.set_train(False)
     # define model
-    model = Model(net, loss_fn=loss, metrics={'WarpCTCAccuracy': WarpCTCAccuracy()})
+    model = Model(net, loss_fn=loss, metrics={'WarpCTCAccuracy': WarpCTCAccuracy(args_opt.platform)})
     # start evaluation
-    res = model.eval(dataset)
+    res = model.eval(dataset, dataset_sink_mode=args_opt.platform == 'Ascend')
     print("result:", res, flush=True)

model_zoo/official/cv/warpctc/scripts/run_distribute_train.sh

@@ -57,6 +57,6 @@ for ((i = 0; i < ${DEVICE_NUM}; i++)); do
   cd ./train_parallel$i || exit
   echo "start training for rank $RANK_ID, device $DEVICE_ID"
   env >env.log
-  python train.py --run_distribute=True --device_num=$DEVICE_NUM --dataset_path=$PATH2 &>log &
+  python train.py --platform=Ascend --dataset_path=$PATH2 --run_distribute > log.txt 2>&1 &
   cd ..
 done

model_zoo/official/cv/warpctc/scripts/run_distribute_train_for_gpu.sh

@@ -0,0 +1,52 @@
+#!/bin/bash
+# Copyright 2020 Huawei Technologies Co., Ltd
+#
+# 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.
+# ============================================================================
+
+if [ $# != 2 ]; then
+  echo "Usage: sh run_distribute_train.sh [RANK_SIZE] [DATASET_PATH]"
+  exit 1
+fi
+
+get_real_path() {
+  if [ "${1:0:1}" == "/" ]; then
+    echo "$1"
+  else
+    echo "$(realpath -m $PWD/$1)"
+  fi
+}
+
+RANK_SIZE=$1
+DATASET_PATH=$(get_real_path $2)
+
+if [ ! -d $DATASET_PATH ]; then
+  echo "error: DATASET_PATH=$DATASET_PATH is not a directory"
+  exit 1
+fi
+
+if [ -d "distribute_train" ]; then
+  rm -rf ./distribute_train
+fi
+
+mkdir ./distribute_train
+cp ../*.py ./distribute_train
+cp -r ../src ./distribute_train
+cd ./distribute_train || exit
+
+mpirun --allow-run-as-root -n $RANK_SIZE \
+  python train.py  \
+    --dataset_path=$DATASET_PATH  \
+    --platform=GPU  \
+    --run_distribute  > log.txt 2>&1 &
+cd ..

model_zoo/official/cv/warpctc/scripts/run_eval.sh

@@ -14,8 +14,8 @@
 # limitations under the License.
 # ============================================================================
 
-if [ $# != 2 ]; then
-  echo "Usage: sh run_eval.sh [DATASET_PATH] [CHECKPOINT_PATH]"
+if [ $# != 3 ]; then
+  echo "Usage: sh run_eval.sh [DATASET_PATH] [CHECKPOINT_PATH] [PLATFORM]"
   exit 1
 fi
 
@@ -29,6 +29,7 @@ get_real_path() {
 
 PATH1=$(get_real_path $1)
 PATH2=$(get_real_path $2)
+PLATFORM=$3
 
 if [ ! -d $PATH1 ]; then
   echo "error: DATASET_PATH=$PATH1 is not a directory"
@@ -40,6 +41,7 @@ if [ ! -f $PATH2 ]; then
   exit 1
 fi
 
+run_ascend() {
   ulimit -u unlimited
   export DEVICE_NUM=1
   export DEVICE_ID=0
@@ -51,10 +53,32 @@ if [ -d "eval" ]; then
   fi
   mkdir ./eval
   cp ../*.py ./eval
-cp *.sh ./eval
   cp -r ../src ./eval
   cd ./eval || exit
   env >env.log
   echo "start evaluation for device $DEVICE_ID"
-python eval.py --dataset_path=$PATH1 --checkpoint_path=$PATH2 &>log &
+  python eval.py --dataset_path=$1 --checkpoint_path=$2 --platform=Ascend > log.txt 2>&1 &
   cd ..
+}
+
+run_gpu() {
+  if [ -d "eval" ]; then
+    rm -rf ./eval
+  fi
+  mkdir ./eval
+  cp ../*.py ./eval
+  cp -r ../src ./eval
+  cd ./eval || exit
+  env >env.log
+  python eval.py --dataset_path=$1 --checkpoint_path=$2 --platform=GPU  > log.txt 2>&1 &
+  cd ..
+}
+
+if [ "Ascend" == $PLATFORM ]; then
+  run_ascend $PATH1 $PATH2
+elif [ "GPU" == $PLATFORM ]; then
+  run_gpu $PATH1 $PATH2
+else
+  echo "error: PLATFORM=$PLATFORM is not support, only support Ascend and GPU."
+fi
+

model_zoo/official/cv/warpctc/scripts/run_standalone_train.sh

@@ -14,8 +14,8 @@
 # limitations under the License.
 # ============================================================================
 
-if [ $# != 1 ]; then
-  echo "Usage: sh run_standalone_train.sh [DATASET_PATH]"
+if [ $# != 2 ]; then
+  echo "Usage: sh run_standalone_train.sh [DATASET_PATH] [PLATFORM]"
   exit 1
 fi
 
@@ -28,27 +28,44 @@ get_real_path() {
 }
 
 PATH1=$(get_real_path $1)
+PLATFORM=$2
 
 if [ ! -d $PATH1 ]; then
   echo "error: DATASET_PATH=$PATH1 is not a directory"
   exit 1
 fi
 
+run_ascend() {
   ulimit -u unlimited
   export DEVICE_NUM=1
   export DEVICE_ID=0
   export RANK_ID=0
   export RANK_SIZE=1
 
+  echo "start training for device $DEVICE_ID"
+  env >env.log
+  python train.py --dataset_path=$1 --platform=Ascend > log.txt 2>&1 &
+  cd ..
+}
+
+run_gpu() {
+  env >env.log
+  python train.py --dataset_path=$1 --platform=GPU  > log.txt 2>&1 &
+  cd ..
+}
+
 if [ -d "train" ]; then
     rm -rf ./train
 fi
 mkdir ./train
 cp ../*.py ./train
-cp *.sh ./train
 cp -r ../src ./train
 cd ./train || exit
-echo "start training for device $DEVICE_ID"
-env >env.log
-python train.py --dataset=$PATH1 &>log &
-cd ..
+
+if [ "Ascend" == $PLATFORM ]; then
+  run_ascend $PATH1
+elif [ "GPU" == $PLATFORM ]; then
+  run_gpu $PATH1
+else
+  echo "error: PLATFORM=$PLATFORM is not support, only support Ascend and GPU."
+fi

model_zoo/official/cv/warpctc/src/dataset.py

@@ -24,24 +24,25 @@ from PIL import Image
 from src.config import config as cf
 
 
-class _CaptchaDataset():
+class _CaptchaDataset:
     """
     create train or evaluation dataset for warpctc
 
     Args:
         img_root_dir(str): root path of images
         max_captcha_digits(int): max number of digits in images.
-        blank(int): value reserved for blank label, default is 10. When parsing label from image file names, if label
-        length is less than max_captcha_digits, the remaining labels are padding with blank.
+        device_target(str): platform of training, support Ascend and GPU.
     """
 
-    def __init__(self, img_root_dir, max_captcha_digits, blank=10):
+    def __init__(self, img_root_dir, max_captcha_digits, device_target='Ascend'):
         if not os.path.exists(img_root_dir):
             raise RuntimeError("the input image dir {} is invalid!".format(img_root_dir))
         self.img_root_dir = img_root_dir
         self.img_names = [i for i in os.listdir(img_root_dir) if i.endswith('.png')]
         self.max_captcha_digits = max_captcha_digits
-        self.blank = blank
+        self.target = device_target
+        self.blank = 10 if self.target == 'Ascend' else 0
+        self.label_length = [len(os.path.splitext(n)[0].split('-')[-1]) for n in self.img_names]
 
     def __len__(self):
         return len(self.img_names)
@@ -54,27 +55,33 @@ class _CaptchaDataset():
         image = np.array(im)
         label_str = os.path.splitext(img_name)[0]
         label_str = label_str[label_str.find('-') + 1:]
+        if self.target == 'Ascend':
             label = [int(i) for i in label_str]
             label.extend([int(self.blank)] * (self.max_captcha_digits - len(label)))
+        else:
+            label = [int(i) + 1 for i in label_str]
+            length = len(label)
+            label.extend([int(self.blank)] * (self.max_captcha_digits - len(label)))
+            label.append(length)
         label = np.array(label)
         return image, label
 
 
-def create_dataset(dataset_path, repeat_num=1, batch_size=1):
+def create_dataset(dataset_path, batch_size=1, num_shards=1, shard_id=0, device_target='Ascend'):
     """
      create train or evaluation dataset for warpctc
 
      Args:
         dataset_path(int): dataset path
-        repeat_num(int): dataset repetition num, default is 1
         batch_size(int): batch size of generated dataset, default is 1
+        num_shards(int): number of devices
+        shard_id(int): rank id
+        device_target(str): platform of training, support Ascend and GPU
      """
-    rank_size = int(os.environ.get("RANK_SIZE")) if os.environ.get("RANK_SIZE") else 1
-    rank_id = int(os.environ.get("RANK_ID")) if os.environ.get("RANK_ID") else 0
 
-    dataset = _CaptchaDataset(dataset_path, cf.max_captcha_digits)
-    ds = de.GeneratorDataset(dataset, ["image", "label"], shuffle=True, num_shards=rank_size, shard_id=rank_id)
-    ds.set_dataset_size(m.ceil(len(dataset) / rank_size))
+    dataset = _CaptchaDataset(dataset_path, cf.max_captcha_digits, device_target)
+    ds = de.GeneratorDataset(dataset, ["image", "label"], shuffle=True, num_shards=num_shards, shard_id=shard_id)
+    ds.set_dataset_size(m.ceil(len(dataset) / num_shards))
     image_trans = [
         vc.Rescale(1.0 / 255.0, 0.0),
         vc.Normalize([0.9010, 0.9049, 0.9025], std=[0.1521, 0.1347, 0.1458]),
@@ -87,6 +94,5 @@ def create_dataset(dataset_path, repeat_num=1, batch_size=1):
     ds = ds.map(input_columns=["image"], num_parallel_workers=8, operations=image_trans)
     ds = ds.map(input_columns=["label"], num_parallel_workers=8, operations=label_trans)
 
-    ds = ds.batch(batch_size)
-    ds = ds.repeat(repeat_num)
+    ds = ds.batch(batch_size, drop_remainder=True)
     return ds

model_zoo/official/cv/warpctc/src/loss.py

@@ -47,3 +47,25 @@ class CTCLoss(_Loss):
         labels_values = self.reshape(label, (-1,))
         loss, _ = self.ctc_loss(logit, self.labels_indices, labels_values, self.sequence_length)
         return loss
+
+
+class CTCLossV2(_Loss):
+    """
+     CTCLoss definition
+
+     Args:
+        max_sequence_length(int): max number of sequence length. For captcha images, the value is equal to image width
+        batch_size(int): batch size of input logits
+     """
+
+    def __init__(self, max_sequence_length, batch_size):
+        super(CTCLossV2, self).__init__()
+        self.input_length = Tensor(np.array([max_sequence_length] * batch_size), mstype.int32)
+        self.reshape = P.Reshape()
+        self.ctc_loss = P.CTCLossV2()
+
+    def construct(self, logit, label):
+        labels_values = label[:, :-1]
+        labels_length = label[:, -1]
+        loss, _ = self.ctc_loss(logit, labels_values, self.input_length, labels_length)
+        return loss

model_zoo/official/cv/warpctc/src/metric.py

@@ -15,19 +15,19 @@
 """Metric for accuracy evaluation."""
 from mindspore import nn
 
-BLANK_LABLE = 10
-
 
 class WarpCTCAccuracy(nn.Metric):
     """
     Define accuracy metric for warpctc network.
     """
 
-    def __init__(self):
+    def __init__(self, device_target='Ascend'):
         super(WarpCTCAccuracy).__init__()
         self._correct_num = 0
         self._total_num = 0
         self._count = 0
+        self.device_target = device_target
+        self.blank = 10 if device_target == 'Ascend' else 0
 
     def clear(self):
         self._correct_num = 0
@@ -39,6 +39,8 @@ class WarpCTCAccuracy(nn.Metric):
 
         y_pred = self._convert_data(inputs[0])
         y = self._convert_data(inputs[1])
+        if self.device_target == 'GPU':
+            y = y[:, :-1]
 
         self._count += 1
 
@@ -54,8 +56,7 @@ class WarpCTCAccuracy(nn.Metric):
             raise RuntimeError('Accuary can not be calculated, because the number of samples is 0.')
         return self._correct_num / self._total_num
 
-    @staticmethod
-    def _is_eq(pred_lbl, target):
+    def _is_eq(self, pred_lbl, target):
         """
         check whether predict label is equal to target label
         """
@@ -63,11 +64,10 @@ class WarpCTCAccuracy(nn.Metric):
         pred_diff = len(target) - len(pred_lbl)
         if pred_diff > 0:
             # padding by BLANK_LABLE
-            pred_lbl.extend([BLANK_LABLE] * pred_diff)
+            pred_lbl.extend([self.blank] * pred_diff)
         return pred_lbl == target
 
-    @staticmethod
-    def _get_prediction(y_pred):
+    def _get_prediction(self, y_pred):
         """
         parse predict result to labels
         """
@@ -78,11 +78,11 @@ class WarpCTCAccuracy(nn.Metric):
         pred_lbls = []
         for i in range(batch_size):
             idx = indices[:, i]
-            last_idx = BLANK_LABLE
+            last_idx = self.blank
             pred_lbl = []
             for j in range(lens[i]):
                 cur_idx = idx[j]
-                if cur_idx not in [last_idx, BLANK_LABLE]:
+                if cur_idx not in [last_idx, self.blank]:
                     pred_lbl.append(cur_idx)
                 last_idx = cur_idx
             pred_lbls.append(pred_lbl)

model_zoo/official/cv/warpctc/src/warpctc.py

@@ -88,3 +88,52 @@ class StackedRNN(nn.Cell):
             output = self.concat((output, h2_after_fc))
 
         return output
+
+
+class StackedRNNForGPU(nn.Cell):
+    """
+     Define a stacked RNN network which contains two LSTM layers and one full-connect layer.
+
+     Args:
+        input_size(int): Size of time sequence. Usually, the input_size is equal to three times of image height for
+        captcha images.
+        batch_size(int): batch size of input data, default is 64
+        hidden_size(int): the hidden size in LSTM layers, default is 512
+        num_layer(int): the number of layer of LSTM.
+     """
+    def __init__(self, input_size, batch_size=64, hidden_size=512, num_layer=2):
+        super(StackedRNNForGPU, self).__init__()
+        self.batch_size = batch_size
+        self.input_size = input_size
+        self.num_classes = 11
+        self.reshape = P.Reshape()
+        self.cast = P.Cast()
+        k = (1 / hidden_size) ** 0.5
+        weight_shape = 4 * hidden_size * (input_size + 3 * hidden_size + 4)
+        self.weight = Parameter(np.random.uniform(-k, k, (weight_shape, 1, 1)).astype(np.float32), name='weight')
+        self.h = Tensor(np.zeros(shape=(num_layer, batch_size, hidden_size)).astype(np.float32))
+        self.c = Tensor(np.zeros(shape=(num_layer, batch_size, hidden_size)).astype(np.float32))
+
+        self.lstm = nn.LSTM(input_size, hidden_size, num_layers=2)
+        self.lstm.weight = self.weight
+
+        self.fc_weight = np.random.random((self.num_classes, hidden_size)).astype(np.float32)
+        self.fc_bias = np.random.random(self.num_classes).astype(np.float32)
+
+        self.fc = nn.Dense(in_channels=hidden_size, out_channels=self.num_classes, weight_init=Tensor(self.fc_weight),
+                           bias_init=Tensor(self.fc_bias))
+
+        self.fc.to_float(mstype.float32)
+        self.expand_dims = P.ExpandDims()
+        self.concat = P.Concat()
+        self.transpose = P.Transpose()
+
+    def construct(self, x):
+        x = self.transpose(x, (3, 0, 2, 1))
+        x = self.reshape(x, (-1, self.batch_size, self.input_size))
+        output, _ = self.lstm(x, (self.h, self.c))
+        res = ()
+        for i in range(F.shape(x)[0]):
+            res += (self.expand_dims(self.fc(output[i]), 0),)
+        res = self.concat(res)
+        return res

model_zoo/official/cv/warpctc/src/warpctc_for_train.py

@@ -42,7 +42,7 @@ grad_div = C.MultitypeFuncGraph("grad_div")
 
 @grad_div.register("Tensor", "Tensor")
 def _grad_div(val, grad):
-    div = P.Div()
+    div = P.RealDiv()
     mul = P.Mul()
     grad = mul(grad, 10.0)
     ret = div(grad, val)

model_zoo/official/cv/warpctc/train.py

@@ -24,12 +24,12 @@ from mindspore import dataset as de
 from mindspore.train.model import Model, ParallelMode
 from mindspore.nn.wrap import WithLossCell
 from mindspore.train.callback import TimeMonitor, LossMonitor, CheckpointConfig, ModelCheckpoint
-from mindspore.communication.management import init
+from mindspore.communication.management import init, get_group_size, get_rank
 
-from src.loss import CTCLoss
+from src.loss import CTCLoss, CTCLossV2
 from src.config import config as cf
 from src.dataset import create_dataset
-from src.warpctc import StackedRNN
+from src.warpctc import StackedRNN, StackedRNNForGPU
 from src.warpctc_for_train import TrainOneStepCellWithGradClip
 from src.lr_schedule import get_lr
 
@@ -38,38 +38,60 @@ np.random.seed(1)
 de.config.set_seed(1)
 
 parser = argparse.ArgumentParser(description="Warpctc training")
-parser.add_argument("--run_distribute", type=bool, default=False, help="Run distribute, default is false.")
-parser.add_argument('--device_num', type=int, default=1, help='Device num, default is 1.')
+parser.add_argument("--run_distribute", action='store_true', help="Run distribute, default is false.")
 parser.add_argument('--dataset_path', type=str, default=None, help='Dataset path, default is None')
+parser.add_argument('--platform', type=str, default='Ascend', choices=['Ascend', 'GPU'],
+                    help='Running platform, choose from Ascend, GPU, and default is Ascend.')
+parser.set_defaults(run_distribute=False)
 args_opt = parser.parse_args()
 
+context.set_context(mode=context.GRAPH_MODE, device_target=args_opt.platform, save_graphs=False)
+if args_opt.platform == 'Ascend':
     device_id = int(os.getenv('DEVICE_ID'))
-context.set_context(mode=context.GRAPH_MODE,
-                    device_target="Ascend",
-                    save_graphs=False,
-                    device_id=device_id)
+    context.set_context(device_id=device_id)
+
 
 if __name__ == '__main__':
+    lr_scale = 1
     if args_opt.run_distribute:
+        if args_opt.platform == 'Ascend':
+            init()
+            lr_scale = 1
+            device_num = int(os.environ.get("RANK_SIZE"))
+            rank = int(os.environ.get("RANK_ID"))
+        else:
+            init('nccl')
+            lr_scale = 0.5
+            device_num = get_group_size()
+            rank = get_rank()
         context.reset_auto_parallel_context()
-        context.set_auto_parallel_context(device_num=args_opt.device_num,
+        context.set_auto_parallel_context(device_num=device_num,
                                           parallel_mode=ParallelMode.DATA_PARALLEL,
                                           mirror_mean=True)
-        init()
+    else:
+        device_num = 1
+        rank = 0
+
     max_captcha_digits = cf.max_captcha_digits
     input_size = m.ceil(cf.captcha_height / 64) * 64 * 3
     # create dataset
-    dataset = create_dataset(dataset_path=args_opt.dataset_path, repeat_num=1, batch_size=cf.batch_size)
+    dataset = create_dataset(dataset_path=args_opt.dataset_path, batch_size=cf.batch_size,
+                             num_shards=device_num, shard_id=rank, device_target=args_opt.platform)
     step_size = dataset.get_dataset_size()
     # define lr
-    lr_init = cf.learning_rate if not args_opt.run_distribute else cf.learning_rate * args_opt.device_num
+    lr_init = cf.learning_rate if not args_opt.run_distribute else cf.learning_rate * device_num * lr_scale
     lr = get_lr(cf.epoch_size, step_size, lr_init)
-    # define loss
-    loss = CTCLoss(max_sequence_length=cf.captcha_width, max_label_length=max_captcha_digits, batch_size=cf.batch_size)
-    # define net
+    if args_opt.platform == 'Ascend':
+        loss = CTCLoss(max_sequence_length=cf.captcha_width,
+                       max_label_length=max_captcha_digits,
+                       batch_size=cf.batch_size)
         net = StackedRNN(input_size=input_size, batch_size=cf.batch_size, hidden_size=cf.hidden_size)
-    # define opt
         opt = nn.SGD(params=net.trainable_params(), learning_rate=lr, momentum=cf.momentum)
+    else:
+        loss = CTCLossV2(max_sequence_length=cf.captcha_width, batch_size=cf.batch_size)
+        net = StackedRNNForGPU(input_size=input_size, batch_size=cf.batch_size, hidden_size=cf.hidden_size)
+        opt = nn.Momentum(params=net.trainable_params(), learning_rate=lr, momentum=cf.momentum)
+
     net = WithLossCell(net, loss)
     net = TrainOneStepCellWithGradClip(net, opt).set_train()
     # define model
@@ -79,6 +101,6 @@ if __name__ == '__main__':
     if cf.save_checkpoint:
         config_ck = CheckpointConfig(save_checkpoint_steps=cf.save_checkpoint_steps,
                                      keep_checkpoint_max=cf.keep_checkpoint_max)
-        ckpt_cb = ModelCheckpoint(prefix="waptctc", directory=cf.save_checkpoint_path, config=config_ck)
+        ckpt_cb = ModelCheckpoint(prefix="warpctc", directory=cf.save_checkpoint_path, config=config_ck)
         callbacks.append(ckpt_cb)
     model.train(cf.epoch_size, dataset, callbacks=callbacks)