##import all library like tensorflow,keras,Sequential ,conv2d,........

classifier = Sequential()

#cnn model

classifier.add(conv2d(..............................................)

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there are a problem in sub code in the following say the classifier is not defined what is the correct code to training the cnn model ?

classifier.fit(train,

steps_per_epoch = len(train) ,

epochs=1,

validation_data = val,

validation_steps = len(val) )