[Doc] add -nc to 'wget' for skipping files already exist (#713)

* add -nc to 'wget' for skipping files already exist

* use typing_extensions instead of typing when import Literal

docs/zh/examples/amgnet.md

@@ -8,7 +8,7 @@
 
         ``` sh
         # linux
-        wget https://paddle-org.bj.bcebos.com/paddlescience/datasets/AMGNet/data.zip
+        wget -nc https://paddle-org.bj.bcebos.com/paddlescience/datasets/AMGNet/data.zip
         # windows
         # curl https://paddle-org.bj.bcebos.com/paddlescience/datasets/AMGNet/data.zip --output data.zip
         # unzip it
@@ -19,7 +19,7 @@
 
         ``` sh
         # linux
-        wget https://paddle-org.bj.bcebos.com/paddlescience/datasets/AMGNet/data.zip
+        wget -nc https://paddle-org.bj.bcebos.com/paddlescience/datasets/AMGNet/data.zip
         # windows
         # curl https://paddle-org.bj.bcebos.com/paddlescience/datasets/AMGNet/data.zip --output data.zip
         # unzip it
@@ -33,7 +33,7 @@
 
         ``` sh
         # linux
-        wget https://paddle-org.bj.bcebos.com/paddlescience/datasets/AMGNet/data.zip
+        wget -nc https://paddle-org.bj.bcebos.com/paddlescience/datasets/AMGNet/data.zip
         # windows
         # curl https://paddle-org.bj.bcebos.com/paddlescience/datasets/AMGNet/data.zip --output data.zip
         # unzip it
@@ -44,7 +44,7 @@
 
         ``` sh
         # linux
-        wget https://paddle-org.bj.bcebos.com/paddlescience/datasets/AMGNet/data.zip
+        wget -nc https://paddle-org.bj.bcebos.com/paddlescience/datasets/AMGNet/data.zip
         # windows
         # curl https://paddle-org.bj.bcebos.com/paddlescience/datasets/AMGNet/data.zip --output data.zip
         # unzip it
@@ -88,12 +88,12 @@
 
 ### 3.1 数据集下载
 
-该案例使用的机翼数据集 Airfoi l来自 de Avila Belbute-Peres 等人，其中翼型数据集采用 NACA0012 翼型，包括 train, test 以及对应的网格数据 mesh_fine；圆柱数据集是原作者利用软件计算的 CFD 算例。
+该案例使用的机翼数据集 Airfoil 来自 de Avila Belbute-Peres 等人，其中翼型数据集采用 NACA0012 翼型，包括 train, test 以及对应的网格数据 mesh_fine；圆柱数据集是原作者利用软件计算的 CFD 算例。
 
 执行以下命令，下载并解压数据集。
 
 ``` shell
-wget https://paddle-org.bj.bcebos.com/paddlescience/datasets/AMGNet/data.zip
+wget -nc https://paddle-org.bj.bcebos.com/paddlescience/datasets/AMGNet/data.zip
 unzip data.zip
 ```
 

docs/zh/examples/aneurysm.md

@@ -6,7 +6,7 @@
 
     ``` sh
     # linux
-    wget https://paddle-org.bj.bcebos.com/paddlescience/datasets/aneurysm/aneurysm_dataset.tar
+    wget -nc https://paddle-org.bj.bcebos.com/paddlescience/datasets/aneurysm/aneurysm_dataset.tar
     # windows
     # curl https://paddle-org.bj.bcebos.com/paddlescience/datasets/aneurysm/aneurysm_dataset.tar --output aneurysm_dataset.tar
     # unzip it
@@ -18,7 +18,7 @@
 
     ``` sh
     # linux
-    wget https://paddle-org.bj.bcebos.com/paddlescience/datasets/aneurysm/aneurysm_dataset.tar
+    wget -nc https://paddle-org.bj.bcebos.com/paddlescience/datasets/aneurysm/aneurysm_dataset.tar
     # windows
     # curl https://paddle-org.bj.bcebos.com/paddlescience/datasets/aneurysm/aneurysm_dataset.tar --output aneurysm_dataset.tar
     # unzip it
@@ -88,7 +88,7 @@ examples/aneurysm/aneurysm.py:27:33
 
 ``` sh
 # linux
-wget https://paddle-org.bj.bcebos.com/paddlescience/datasets/aneurysm/aneurysm_dataset.tar
+wget -nc https://paddle-org.bj.bcebos.com/paddlescience/datasets/aneurysm/aneurysm_dataset.tar
 
 # windows
 # curl https://paddle-org.bj.bcebos.com/paddlescience/datasets/aneurysm/aneurysm_dataset.tar --output aneurysm_dataset.tar

docs/zh/examples/bracket.md

@@ -6,7 +6,7 @@
 
     ``` sh
     # linux
-    wget https://paddle-org.bj.bcebos.com/paddlescience/datasets/bracket/bracket_dataset.tar
+    wget -nc https://paddle-org.bj.bcebos.com/paddlescience/datasets/bracket/bracket_dataset.tar
     # windows
     # curl https://paddle-org.bj.bcebos.com/paddlescience/datasets/bracket/bracket_dataset.tar --output bracket_dataset.tar
     # unzip it
@@ -18,7 +18,7 @@
 
     ``` sh
     # linux
-    wget https://paddle-org.bj.bcebos.com/paddlescience/datasets/bracket/bracket_dataset.tar
+    wget -nc https://paddle-org.bj.bcebos.com/paddlescience/datasets/bracket/bracket_dataset.tar
     # windows
     # curl https://paddle-org.bj.bcebos.com/paddlescience/datasets/bracket/bracket_dataset.tar --output bracket_dataset.tar
     # unzip it
@@ -110,7 +110,7 @@ examples/bracket/bracket.py:40:45
 
 ``` sh
 # linux
-wget https://paddle-org.bj.bcebos.com/paddlescience/datasets/bracket/bracket_dataset.tar
+wget -nc https://paddle-org.bj.bcebos.com/paddlescience/datasets/bracket/bracket_dataset.tar
 
 # windows
 # curl https://paddle-org.bj.bcebos.com/paddlescience/datasets/bracket/bracket_dataset.tar --output bracket_dataset.tar

docs/zh/examples/bubble.md

@@ -4,7 +4,7 @@
 
     ``` sh
     # linux
-    wget https://paddle-org.bj.bcebos.com/paddlescience/datasets/BubbleNet/bubble.mat
+    wget -nc https://paddle-org.bj.bcebos.com/paddlescience/datasets/BubbleNet/bubble.mat
     # windows
     # curl https://paddle-org.bj.bcebos.com/paddlescience/datasets/BubbleNet/bubble.mat --output bubble.mat
     python bubble.py
@@ -14,7 +14,7 @@
 
     ``` sh
     # linux
-    wget https://paddle-org.bj.bcebos.com/paddlescience/datasets/BubbleNet/bubble.mat
+    wget -nc https://paddle-org.bj.bcebos.com/paddlescience/datasets/BubbleNet/bubble.mat
     # windows
     # curl https://paddle-org.bj.bcebos.com/paddlescience/datasets/BubbleNet/bubble.mat --output bubble.mat
     python bubble.py mode=eval EVAL.pretrained_model_path=https://paddle-org.bj.bcebos.com/paddlescience/models/bubble/bubble_pretrained.pdparams

docs/zh/examples/cfdgcn.md

@@ -38,7 +38,7 @@
 * mesh数据下载
 
 ```shell
-wget https://paddle-org.bj.bcebos.com/paddlescience/datasets/CFDGCN/meshes.tar
+wget -nc https://paddle-org.bj.bcebos.com/paddlescience/datasets/CFDGCN/meshes.tar
 tar -xf meshes.tar
 ```
 

docs/zh/examples/control_arm.md

@@ -8,7 +8,7 @@
 
         ``` sh
         # linux
-        wget https://paddle-org.bj.bcebos.com/paddlescience/datasets/control_arm/control_arm.stl -P ./datasets/
+        wget -nc https://paddle-org.bj.bcebos.com/paddlescience/datasets/control_arm/control_arm.stl -P ./datasets/
         # windows
         # curl https://paddle-org.bj.bcebos.com/paddlescience/datasets/control_arm/control_arm.stl --output ./datasets/control_arm.stl
         python forward_analysis.py
@@ -18,7 +18,7 @@
 
         ``` sh
         # linux
-        wget https://paddle-org.bj.bcebos.com/paddlescience/datasets/control_arm/control_arm.stl -P ./datasets/
+        wget -nc https://paddle-org.bj.bcebos.com/paddlescience/datasets/control_arm/control_arm.stl -P ./datasets/
         # windows
         # curl https://paddle-org.bj.bcebos.com/paddlescience/datasets/control_arm/control_arm.stl --output ./datasets/control_arm.stl
         python inverse_parameter.py TRAIN.pretrained_model_path=https://paddle-org.bj.bcebos.com/paddlescience/models/control_arm/forward_x_axis_pretrained.pdparams
@@ -30,7 +30,7 @@
 
         ``` sh
         # linux
-        wget https://paddle-org.bj.bcebos.com/paddlescience/datasets/control_arm/control_arm.stl -P ./datasets/
+        wget -nc https://paddle-org.bj.bcebos.com/paddlescience/datasets/control_arm/control_arm.stl -P ./datasets/
         # windows
         # curl https://paddle-org.bj.bcebos.com/paddlescience/datasets/control_arm/control_arm.stl --output ./datasets/control_arm.stl
         python forward_analysis.py mode=eval EVAL.pretrained_model_path=https://paddle-org.bj.bcebos.com/paddlescience/models/control_arm/forward_x_axis_pretrained.pdparams
@@ -40,7 +40,7 @@
 
         ``` sh
         # linux
-        wget https://paddle-org.bj.bcebos.com/paddlescience/datasets/control_arm/control_arm.stl -P ./datasets/
+        wget -nc https://paddle-org.bj.bcebos.com/paddlescience/datasets/control_arm/control_arm.stl -P ./datasets/
         # windows
         # curl https://paddle-org.bj.bcebos.com/paddlescience/datasets/control_arm/control_arm.stl --output ./datasets/control_arm.stl
         python inverse_parameter.py mode=eval EVAL.pretrained_model_path=https://paddle-org.bj.bcebos.com/paddlescience/models/control_arm/inverse_x_axis_pretrained.pdparams

docs/zh/examples/cylinder2d_unsteady.md

@@ -6,7 +6,7 @@
 
     ``` sh
     # linux
-    wget https://paddle-org.bj.bcebos.com/paddlescience/datasets/cylinder2d_unsteady_Re100/cylinder2d_unsteady_Re100_dataset.tar
+    wget -nc https://paddle-org.bj.bcebos.com/paddlescience/datasets/cylinder2d_unsteady_Re100/cylinder2d_unsteady_Re100_dataset.tar
     # windows
     # curl https://paddle-org.bj.bcebos.com/paddlescience/datasets/cylinder2d_unsteady_Re100/cylinder2d_unsteady_Re100_dataset.tar --output cylinder2d_unsteady_Re100_dataset.tar
     # unzip it
@@ -18,7 +18,7 @@
 
     ``` sh
     # linux
-    wget https://paddle-org.bj.bcebos.com/paddlescience/datasets/cylinder2d_unsteady_Re100/cylinder2d_unsteady_Re100_dataset.tar
+    wget -nc https://paddle-org.bj.bcebos.com/paddlescience/datasets/cylinder2d_unsteady_Re100/cylinder2d_unsteady_Re100_dataset.tar
     # windows
     # curl https://paddle-org.bj.bcebos.com/paddlescience/datasets/cylinder2d_unsteady_Re100/cylinder2d_unsteady_Re100_dataset.tar --output cylinder2d_unsteady_Re100_dataset.tar
     # unzip it
@@ -126,7 +126,7 @@ $$
 在开始构建代码之前，请先按照下列命令下载训练、评估所需的数据集
 
 ``` sh
-wget https://paddle-org.bj.bcebos.com/paddlescience/datasets/cylinder2d_unsteady_Re100/cylinder2d_unsteady_Re100_dataset.tar
+wget -nc https://paddle-org.bj.bcebos.com/paddlescience/datasets/cylinder2d_unsteady_Re100/cylinder2d_unsteady_Re100_dataset.tar
 tar -xf cylinder2d_unsteady_Re100_dataset.tar
 ```
 

docs/zh/examples/cylinder2d_unsteady_transformer_physx.md

@@ -6,8 +6,8 @@
 
     ``` sh
     # linux
-    wget https://paddle-org.bj.bcebos.com/paddlescience/datasets/transformer_physx/cylinder_training.hdf5 -P ./datasets/
-    wget https://paddle-org.bj.bcebos.com/paddlescience/datasets/transformer_physx/cylinder_valid.hdf5 -P ./datasets/
+    wget -nc https://paddle-org.bj.bcebos.com/paddlescience/datasets/transformer_physx/cylinder_training.hdf5 -P ./datasets/
+    wget -nc https://paddle-org.bj.bcebos.com/paddlescience/datasets/transformer_physx/cylinder_valid.hdf5 -P ./datasets/
     # windows
     # curl https://paddle-org.bj.bcebos.com/paddlescience/datasets/transformer_physx/cylinder_training.hdf5 --output ./datasets/cylinder_training.hdf5
     # curl https://paddle-org.bj.bcebos.com/paddlescience/datasets/transformer_physx/cylinder_valid.hdf5 --output ./datasets/cylinder_valid.hdf5
@@ -19,8 +19,8 @@
 
     ``` sh
     # linux
-    wget https://paddle-org.bj.bcebos.com/paddlescience/datasets/transformer_physx/cylinder_training.hdf5 -P ./datasets/
-    wget https://paddle-org.bj.bcebos.com/paddlescience/datasets/transformer_physx/cylinder_valid.hdf5 -P ./datasets/
+    wget -nc https://paddle-org.bj.bcebos.com/paddlescience/datasets/transformer_physx/cylinder_training.hdf5 -P ./datasets/
+    wget -nc https://paddle-org.bj.bcebos.com/paddlescience/datasets/transformer_physx/cylinder_valid.hdf5 -P ./datasets/
     # windows
     # curl https://paddle-org.bj.bcebos.com/paddlescience/datasets/transformer_physx/cylinder_training.hdf5 --output ./datasets/cylinder_training.hdf5
     # curl https://paddle-org.bj.bcebos.com/paddlescience/datasets/transformer_physx/cylinder_valid.hdf5 --output ./datasets/cylinder_valid.hdf5

docs/zh/examples/deepcfd.md

@@ -75,8 +75,8 @@ $$u_x\frac{\partial u_y}{\partial x} + u_y\frac{\partial u_y}{\partial y} = - \f
 运行本问题代码前请按照下方命令下载 [dataX](https://paddle-org.bj.bcebos.com/paddlescience/datasets/DeepCFD/dataX.pkl) 和 [dataY](https://paddle-org.bj.bcebos.com/paddlescience/datasets/DeepCFD/dataY.pkl)：
 
 ``` shell
-wget -P ./datasets/ https://paddle-org.bj.bcebos.com/paddlescience/datasets/DeepCFD/dataX.pkl
-wget -P ./datasets/ https://paddle-org.bj.bcebos.com/paddlescience/datasets/DeepCFD/dataY.pkl
+wget -nc -P ./datasets/ https://paddle-org.bj.bcebos.com/paddlescience/datasets/DeepCFD/dataX.pkl
+wget -nc -P ./datasets/ https://paddle-org.bj.bcebos.com/paddlescience/datasets/DeepCFD/dataY.pkl
 ```
 
 dataX 和 dataY 都具有相同的维度（Ns，Nc，Nx，Ny），其中第一轴是样本数（Ns），第二轴是通道数（Nc），第三和第四轴分别是 x 和 y 中的元素数量（Nx 和 Ny）。在输入数据 dataX 中，第一通道是计算域中障碍物的SDF（Signed distance function），第二通道是流动区域的标签，第三通道是计算域边界的 SDF。在输出数据 dataY 中，第一个通道是水平速度分量（Ux），第二个通道是垂直速度分量（Uy），第三个通道是流体压强（p）。

docs/zh/examples/deeponet.md

@@ -6,8 +6,8 @@
 
     ``` sh
     # linux
-    wget https://paddle-org.bj.bcebos.com/paddlescience/datasets/DeepONet/antiderivative_unaligned_train.npz
-    wget https://paddle-org.bj.bcebos.com/paddlescience/datasets/DeepONet/antiderivative_unaligned_test.npz
+    wget -nc https://paddle-org.bj.bcebos.com/paddlescience/datasets/DeepONet/antiderivative_unaligned_train.npz
+    wget -nc https://paddle-org.bj.bcebos.com/paddlescience/datasets/DeepONet/antiderivative_unaligned_test.npz
     # windows
     # curl https://paddle-org.bj.bcebos.com/paddlescience/datasets/deeponet/antiderivative_unaligned_train.npz --output antiderivative_unaligned_train.npz
     # curl https://paddle-org.bj.bcebos.com/paddlescience/datasets/deeponet/antiderivative_unaligned_test.npz --output antiderivative_unaligned_test.npz
@@ -18,8 +18,8 @@
 
     ``` sh
     # linux
-    wget https://paddle-org.bj.bcebos.com/paddlescience/datasets/DeepONet/antiderivative_unaligned_train.npz
-    wget https://paddle-org.bj.bcebos.com/paddlescience/datasets/DeepONet/antiderivative_unaligned_test.npz
+    wget -nc https://paddle-org.bj.bcebos.com/paddlescience/datasets/DeepONet/antiderivative_unaligned_train.npz
+    wget -nc https://paddle-org.bj.bcebos.com/paddlescience/datasets/DeepONet/antiderivative_unaligned_test.npz
     # windows
     # curl https://paddle-org.bj.bcebos.com/paddlescience/datasets/deeponet/antiderivative_unaligned_train.npz --output antiderivative_unaligned_train.npz
     # curl https://paddle-org.bj.bcebos.com/paddlescience/datasets/deeponet/antiderivative_unaligned_test.npz --output antiderivative_unaligned_test.npz

docs/zh/examples/epnn.md

@@ -4,8 +4,8 @@
 
     ``` sh
     # linux
-    wget https://paddle-org.bj.bcebos.com/paddlescience/datasets/epnn/dstate-16-plas.dat -P ./datasets/
-    wget https://paddle-org.bj.bcebos.com/paddlescience/datasets/epnn/dstress-16-plas.dat -P ./datasets/
+    wget -nc https://paddle-org.bj.bcebos.com/paddlescience/datasets/epnn/dstate-16-plas.dat -P ./datasets/
+    wget -nc https://paddle-org.bj.bcebos.com/paddlescience/datasets/epnn/dstress-16-plas.dat -P ./datasets/
     # windows
     # curl https://paddle-org.bj.bcebos.com/paddlescience/datasets/epnn/dstate-16-plas.dat --output datasets/dstate-16-plas.dat
     # curl https://paddle-org.bj.bcebos.com/paddlescience/datasets/epnn/dstress-16-plas.dat --output datasets/dstress-16-plas.dat
@@ -16,8 +16,8 @@
 
     ``` sh
     # linux
-    wget https://paddle-org.bj.bcebos.com/paddlescience/datasets/epnn/dstate-16-plas.dat -P ./datasets/
-    wget https://paddle-org.bj.bcebos.com/paddlescience/datasets/epnn/dstress-16-plas.dat -P ./datasets/
+    wget -nc https://paddle-org.bj.bcebos.com/paddlescience/datasets/epnn/dstate-16-plas.dat -P ./datasets/
+    wget -nc https://paddle-org.bj.bcebos.com/paddlescience/datasets/epnn/dstress-16-plas.dat -P ./datasets/
     # windows
     # curl https://paddle-org.bj.bcebos.com/paddlescience/datasets/epnn/dstate-16-plas.dat --output datasets/dstate-16-plas.dat
     # curl https://paddle-org.bj.bcebos.com/paddlescience/datasets/epnn/dstress-16-plas.dat --output datasets/dstress-16-plas.dat

docs/zh/examples/hpinns.md

@@ -6,8 +6,8 @@
 
     ``` sh
     # linux
-    wget https://paddle-org.bj.bcebos.com/paddlescience/datasets/hPINNs/hpinns_holo_train.mat -P ./datasets/
-    wget https://paddle-org.bj.bcebos.com/paddlescience/datasets/hPINNs/hpinns_holo_valid.mat -P ./datasets/
+    wget -nc https://paddle-org.bj.bcebos.com/paddlescience/datasets/hPINNs/hpinns_holo_train.mat -P ./datasets/
+    wget -nc https://paddle-org.bj.bcebos.com/paddlescience/datasets/hPINNs/hpinns_holo_valid.mat -P ./datasets/
     # windows
     # curl https://paddle-org.bj.bcebos.com/paddlescience/datasets/hPINNs/hpinns_holo_train.mat --output ./datasets/hpinns_holo_train.mat
     # curl https://paddle-org.bj.bcebos.com/paddlescience/datasets/hPINNs/hpinns_holo_valid.mat --output ./datasets/hpinns_holo_valid.mat
@@ -18,8 +18,8 @@
 
     ``` sh
     # linux
-    wget https://paddle-org.bj.bcebos.com/paddlescience/datasets/hPINNs/hpinns_holo_train.mat -P ./datasets/
-    wget https://paddle-org.bj.bcebos.com/paddlescience/datasets/hPINNs/hpinns_holo_valid.mat -P ./datasets/
+    wget -nc https://paddle-org.bj.bcebos.com/paddlescience/datasets/hPINNs/hpinns_holo_train.mat -P ./datasets/
+    wget -nc https://paddle-org.bj.bcebos.com/paddlescience/datasets/hPINNs/hpinns_holo_valid.mat -P ./datasets/
     # windows
     # curl https://paddle-org.bj.bcebos.com/paddlescience/datasets/hPINNs/hpinns_holo_train.mat --output ./datasets/hpinns_holo_train.mat
     # curl https://paddle-org.bj.bcebos.com/paddlescience/datasets/hPINNs/hpinns_holo_valid.mat --output ./datasets/hpinns_holo_valid.mat
@@ -83,8 +83,8 @@ $$
 运行本问题代码前请按照下方命令下载 [训练数据集](https://paddle-org.bj.bcebos.com/paddlescience/datasets/hPINNs/hpinns_holo_train.mat) 和 [验证数据集](https://paddle-org.bj.bcebos.com/paddlescience/datasets/hPINNs/hpinns_holo_valid.mat)：
 
 ``` shell
-wget -P ./datasets/ https://paddle-org.bj.bcebos.com/paddlescience/datasets/hPINNs/hpinns_holo_train.mat
-wget -P ./datasets/ https://paddle-org.bj.bcebos.com/paddlescience/datasets/hPINNs/hpinns_holo_valid.mat
+wget -nc -P ./datasets/ https://paddle-org.bj.bcebos.com/paddlescience/datasets/hPINNs/hpinns_holo_train.mat
+wget -nc -P ./datasets/ https://paddle-org.bj.bcebos.com/paddlescience/datasets/hPINNs/hpinns_holo_valid.mat
 ```
 
 ### 3.2 模型构建

docs/zh/examples/labelfree_DNN_surrogate.md

@@ -520,7 +520,7 @@ examples/aneurysm/aneurysm_flow.py:206:218
 
 ``` sh
 # linux
-wget https://paddle-org.bj.bcebos.com/paddlescience/datasets/aneurysm_flow/data.zip
+wget -nc https://paddle-org.bj.bcebos.com/paddlescience/datasets/aneurysm_flow/data.zip
 
 # windows
 # curl https://paddle-org.bj.bcebos.com/paddlescience/datasets/aneurysm_flow/data.zip --output data.zip

docs/zh/examples/lorenz.md

@@ -6,8 +6,8 @@
 
     ``` sh
     # linux
-    wget https://paddle-org.bj.bcebos.com/paddlescience/datasets/transformer_physx/lorenz_training_rk.hdf5 -P ./datasets/
-    wget https://paddle-org.bj.bcebos.com/paddlescience/datasets/transformer_physx/lorenz_valid_rk.hdf5 -P ./datasets/
+    wget -nc https://paddle-org.bj.bcebos.com/paddlescience/datasets/transformer_physx/lorenz_training_rk.hdf5 -P ./datasets/
+    wget -nc https://paddle-org.bj.bcebos.com/paddlescience/datasets/transformer_physx/lorenz_valid_rk.hdf5 -P ./datasets/
     # windows
     # curl https://paddle-org.bj.bcebos.com/paddlescience/datasets/transformer_physx/lorenz_training_rk.hdf5 --output ./datasets/lorenz_training_rk.hdf5
     # curl https://paddle-org.bj.bcebos.com/paddlescience/datasets/transformer_physx/lorenz_valid_rk.hdf5 --output ./datasets/lorenz_valid_rk.hdf5
@@ -19,8 +19,8 @@
 
     ``` sh
     # linux
-    wget https://paddle-org.bj.bcebos.com/paddlescience/datasets/transformer_physx/lorenz_training_rk.hdf5 -P ./datasets/
-    wget https://paddle-org.bj.bcebos.com/paddlescience/datasets/transformer_physx/lorenz_valid_rk.hdf5 -P ./datasets/
+    wget -nc https://paddle-org.bj.bcebos.com/paddlescience/datasets/transformer_physx/lorenz_training_rk.hdf5 -P ./datasets/
+    wget -nc https://paddle-org.bj.bcebos.com/paddlescience/datasets/transformer_physx/lorenz_valid_rk.hdf5 -P ./datasets/
     # windows
     # curl https://paddle-org.bj.bcebos.com/paddlescience/datasets/transformer_physx/lorenz_training_rk.hdf5 --output ./datasets/lorenz_training_rk.hdf5
     # curl https://paddle-org.bj.bcebos.com/paddlescience/datasets/transformer_physx/lorenz_valid_rk.hdf5 --output ./datasets/lorenz_valid_rk.hdf5

docs/zh/examples/nowcastnet.md

@@ -8,7 +8,7 @@
 
     ``` sh
     # linux
-    wget https://paddle-org.bj.bcebos.com/paddlescience/datasets/nowcastnet/mrms.tar
+    wget -nc https://paddle-org.bj.bcebos.com/paddlescience/datasets/nowcastnet/mrms.tar
     # windows
     # curl https://paddle-org.bj.bcebos.com/paddlescience/datasets/nowcastnet/mrms.tar --output mrms.tar
     mkdir ./datasets