Triplet semihard loss

Source: R/losses.R

Computes the triplet loss with semi-hard negative mining.

loss_triplet_semihard(margin = 1, name = NULL, ...)

Arguments

margin

Float, margin term in the loss definition. Default value is 1.0.
name

Optional name for the op.
...

additional arguments to pass

Value

triplet_loss: float scalar with dtype of y_pred.

Examples


if (FALSE) {
model = keras_model_sequential() %>%
  layer_conv_2d(filters = 64, kernel_size = 2, padding='same', input_shape=c(28,28,1)) %>%
  layer_max_pooling_2d(pool_size=2) %>%
  layer_flatten() %>%
  layer_dense(256, activation= NULL) %>%
  layer_lambda(f = function(x) tf$math$l2_normalize(x, axis = 1L))

model %>% compile(
  optimizer = optimizer_lazy_adam(),
  # apply triplet semihard loss
  loss = loss_triplet_semihard())
}