解释代码import tensorflow as tffrom kerasmodels import Modelfrom kerasapplicationsvgg16 import VGG16from keraslayers import Input Conv2D Concatenate UpSampling2D BatchNormalizationfrom east import cfgclas

The code imports necessary modules and defines a class named EAST. The EAST class has methods to define the EAST network architecture and quad_loss function. The EAST network is a deep learning model used for text detection and recognition. The quad_loss function is a custom loss function used to train the EAST network. The code also defines helper functions such as smooth_l1_loss and quad_norm to calculate the loss. Overall, the code is used to define and train the EAST network for text detection and recognition