simplify_ctc_greedy_decoder_seq_len.hpp

// Copyright (C) 2018-2021 Intel Corporation
// SPDX-License-Identifier: Apache-2.0
//
 
#pragma once
 
#include <memory>
 
#include <transformations_visibility.hpp>
 
#include <ngraph/pass/graph_rewrite.hpp>
 
namespace ngraph {
namespace pass {
 
class TRANSFORMATIONS_API SimplifyCTCGreedyDecoderSeqLen;
 
}  // namespace pass
}  // namespace ngraph
 
/**
 * @ingroup ie_transformation_common_api
 * @brief SimplifyCTCGreedyDecoder converts v6:CTCGreedyDecoderSeqLen into v0::CTCGreedyDecoder.
 *
 *            data[N, T, C]    seq_len[N]
 *                   \          /
 *            CTCGreedyDecoderSeqLen
 *
 * will be converted to
 *
 *           data[T, N, C]   seq_mask[T, N]
 *                    \         /
 *                  CTCGreedyDecoder
 *                    /         \
 *       class_index[N, T]    seq_len[N]
 *
 * The transformation works only for case when the blank_index input == C-1, where C is the number of classes.
 */
class ngraph::pass::SimplifyCTCGreedyDecoderSeqLen: public ngraph::pass::MatcherPass {
public:
    NGRAPH_RTTI_DECLARATION;
    SimplifyCTCGreedyDecoderSeqLen();
};