keras/src/callbacks/tensorboard.py/TensorBoard/_log_embeddings
class TensorBoard:    def _log_embeddings(self, epoch):
        embeddings_ckpt = os.path.join(
            self._log_write_dir,
            "train",
            f"keras_embedding.ckpt-{epoch}.weights.h5",
        )
        self.model.save_weights(embeddings_ckpt)