tf.keras.backend.categorical_focal_crossentropy

УСТАРЕЛО.

tf.keras.backend.categorical_focal_crossentropy(
    target, output, alpha=0.25, gamma=2.0, from_logits=False, axis=-1
)

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Code samples licensed under the Apache 2.0 License.
https://www.tensorflow.org/api_docs/python/tf/keras/backend/categorical_focal_crossentropy