Fix EPNN (PaddlePaddle#636)

* Fix

* Fix

* Fix

docs/zh/examples/epnn.md

@@ -4,23 +4,23 @@
 
     ``` sh
     # linux
-    wget https://paddle-org.bj.bcebos.com/paddlescience/datasets/dstate-16-plas.dat -O datasets/dstate-16-plas.dat
-    wget https://paddle-org.bj.bcebos.com/paddlescience/datasets/dstress-16-plas.dat -O datasets/dstress-16-plas.dat
+    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/
     # windows
-    # curl https://paddle-org.bj.bcebos.com/paddlescience/datasets/dstate-16-plas.dat --output datasets/dstate-16-plas.dat
-    # curl https://paddle-org.bj.bcebos.com/paddlescience/datasets/dstress-16-plas.dat --output datasets/dstress-16-plas.dat
+    # 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
     python epnn.py
     ```
 
 === "模型评估命令"
 
     ``` sh
     # linux
-    wget https://paddle-org.bj.bcebos.com/paddlescience/datasets/dstate-16-plas.dat -O datasets/dstate-16-plas.dat
-    wget https://paddle-org.bj.bcebos.com/paddlescience/datasets/dstress-16-plas.dat -O datasets/dstress-16-plas.dat
+    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/
     # windows
-    # curl https://paddle-org.bj.bcebos.com/paddlescience/datasets/dstate-16-plas.dat --output datasets/dstate-16-plas.dat
-    # curl https://paddle-org.bj.bcebos.com/paddlescience/datasets/dstress-16-plas.dat --output datasets/dstress-16-plas.dat
+    # 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
     python epnn.py mode=eval EVAL.pretrained_model_path=https://paddle-org.bj.bcebos.com/paddlescience/models/epnn/epnn_pretrained.pdparams
     ```
 
@@ -53,7 +53,7 @@ examples/epnn/functions.py:370:390
 --8<--
 ```
 
-Epnn 参数 input_keys 是输入字段名，output_keys 是输出字段名，node_sizes 是节点大小列表，activations 是激活函数字符串列表，drop_p 是节点丢弃概率。
+EPNN 参数 `input_keys` 是输入字段名，`output_keys` 是输出字段名，`node_sizes` 是节点大小列表，`activations` 是激活函数字符串列表，`drop_p` 是节点丢弃概率。
 
 ### 3.2 数据生成
 
@@ -120,7 +120,7 @@ examples/epnn/conf/epnn.yaml:40:41
 
 训练过程会调用优化器来更新模型参数，此处选择较为常用的 `Adam` 优化器，并配合使用机器学习中常用的 ExponentialDecay 学习率调整策略。
 
-由于使用多个模型，需要设置多个优化器，对 Epnn 网络部分，需要设置 `Adam` 优化器。
+由于使用多个模型，需要设置多个优化器，对 EPNN 网络部分，需要设置 `Adam` 优化器。
 
 ``` py linenums="395"
 --8<--

ppsci/arch/epnn.py

@@ -12,39 +12,38 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-""" Elasto-Plastic Neural Network (EPNN)
-
-DEVELOPED AT:
-                    COMPUTATIONAL GEOMECHANICS LABORATORY
-                    DEPARTMENT OF CIVIL ENGINEERING
-                    UNIVERSITY OF CALGARY, AB, CANADA
-                    DIRECTOR: Prof. Richard Wan
-
-DEVELOPED BY:
-                    MAHDAD EGHBALIAN
-
-MIT License
-
-Copyright (c) 2022 Mahdad Eghbalian
-
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to deal
-in the Software without restriction, including without limitation the rights
-to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in all
-copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-SOFTWARE.
-"""
+# Elasto-Plastic Neural Network (EPNN)
+
+# DEVELOPED AT:
+#                     COMPUTATIONAL GEOMECHANICS LABORATORY
+#                     DEPARTMENT OF CIVIL ENGINEERING
+#                     UNIVERSITY OF CALGARY, AB, CANADA
+#                     DIRECTOR: Prof. Richard Wan
+
+# DEVELOPED BY:
+#                     MAHDAD EGHBALIAN
+
+# MIT License
+
+# Copyright (c) 2022 Mahdad Eghbalian
+
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+
+# The above copyright notice and this permission notice shall be included in all
+# copies or substantial portions of the Software.
+
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+# SOFTWARE.
 
 from typing import Tuple