In Keras, losses are functions that are used to measure the difference between the predicted output of a neural network and the actual output. The "losses" module in Keras provides several options for loss functions, such as mean squared error, categorical cross-entropy, and binary cross-entropy.
Here's an example of how to use the losses module in Keras:
pythonfrom keras.models import Sequential
from keras.layers import Dense
from keras.losses import mean_squared_error
model = Sequential()
model.add(Dense(64, input_dim=100, activation='relu'))
model.add(Dense(32, activation='relu'))
model.add(Dense(1, activation='sigmoid'))
model.compile(loss=mean_squared_error, optimizer='adam')
In the example above, we are creating a sequential model with three dense layers. The first layer has 64 units and is activated using the 'relu' activation function. The second layer has 32 units and is also activated using the 'relu' activation function. The third and final layer has one unit and is activated using the sigmoid function.
We have specified the mean squared error loss function using the "loss" parameter in the "compile" method. The "optimizer" parameter specifies the optimizer that will be used to minimize the loss during training.
By default, Keras uses the mean squared error loss function for regression problems and the categorical cross-entropy loss function for multi-class classification problems. However, you can choose to use any of the loss functions available in the "losses" module for your specific problem.
Loss functions help the neural network to learn by providing feedback on the performance of the model during training. The goal of the neural network is to minimize the loss function, which means that the predicted output of the model should be as close as possible to the actual output.
Keywords: Keras losses, loss functions, mean squared error, categorical cross-entropy, binary cross-entropy, neural network training, model performance, how to use Keras losses.
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