metric_binary_accuracy: Model performance metrics

Description

Model performance metrics

Usage

metric_binary_accuracy(y_true, y_pred)
metric_binary_crossentropy(y_true, y_pred)
metric_categorical_accuracy(y_true, y_pred)
metric_categorical_crossentropy(y_true, y_pred)
metric_cosine_proximity(y_true, y_pred)
metric_hinge(y_true, y_pred)
metric_kullback_leibler_divergence(y_true, y_pred)
metric_mean_absolute_error(y_true, y_pred)
metric_mean_absolute_percentage_error(y_true, y_pred)
metric_mean_squared_error(y_true, y_pred)
metric_mean_squared_logarithmic_error(y_true, y_pred)
metric_poisson(y_true, y_pred)
metric_sparse_categorical_crossentropy(y_true, y_pred)
metric_squared_hinge(y_true, y_pred)
metric_top_k_categorical_accuracy(y_true, y_pred, k = 5)
metric_sparse_top_k_categorical_accuracy(y_true, y_pred, k = 5)

Arguments

y_true

True labels (tensor)

y_pred

Predictions (tensor of the same shape as y_true).

An integer, number of top elements to consider.

Custom Metrics

You can provide an arbitrary R function as a custom metric. Note that the y_true and y_pred parameters are tensors, so computations on them should use backend tensor functions. For example:

# create metric using backend tensor functions
K <- backend()
metric_mean_pred <- function(y_true, y_pred) {
  K$mean(y_pred) 
}
model 
  optimizer = optimizer_rmsprop(),
  loss = loss_binary_crossentropy,
  metrics = c('accuracy', 
              'mean_pred' = metric_mean_pred)
)

Note that a name ('mean_pred') is provided for the custom metric function. This name is used within training progress output.

Documentation on the available backend tensor functions can be found at https://rstudio.github.io/keras/articles/backend.html#backend-functions.