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/*
* Copyright 2020 Amazon.com, Inc. or its affiliates. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License"). You may not use this file except in compliance
* with the License. A copy of the License is located at
*
* http://aws.amazon.com/apache2.0/
*
* or in the "license" file accompanying this file. This file is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES
* OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions
* and limitations under the License.
*/
package ai.djl.nn.core;
import java.io.IOException;
import java.util.Optional;
/**
* An {@link AbstractEmbedding} where each embedded item can be assigned an integer index.
*
* @param the type of the item that should be embedded
*/
public interface AbstractIndexedEmbedding extends AbstractEmbedding {
/**
* Encodes an object of input type into a byte array. This is used in saving and loading the
* {@link Embedding} objects.
*
* @param input the input object to be encoded
* @return the encoded byte array.
* @throws IOException if there is an error while encoding
*/
byte[] encode(T input) throws IOException;
/**
* Decodes the given byte array into an object of input parameter type.
*
* @param byteArray the byte array to be decoded
* @return the decode object of input parameter type
* @throws IOException if there was an error while decoding
*/
T decode(byte[] byteArray) throws IOException;
/**
* Embeds an item.
*
* @param item the item to embed
* @return the index of the item in the embedding
*/
long embed(T item);
/**
* Returns the item corresponding to the given index.
*
* @param index the index
* @return the item corresponding to the given index
*/
Optional unembed(long index);
}