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import os

from keras import backend as K
from keras import callbacks
from keras import layers
from keras import models
from keras.wrappers.scikit_learn import KerasClassifier
import pandas as pd
import tensorflow as tf
from sklearn import metrics

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import torch
import torch.nn as nn
import torch.nn.functional as F

# Focal loss implementation inspired by
# https://github.com/c0nn3r/RetinaNet/blob/master/focal_loss.py
# https://github.com/doiken23/pytorch_toolbox/blob/master/focalloss2d.py
class MultiClassBCELoss(nn.Module):
    def __init__(self,
                 use_weight_mask=False,

Ab1992ao