Interactions between neural network-based intra prediction modes and regular intra prediction modes

A method of video decoding, comprising:

• obtaining, for a current coding block, information representative of a neural network-based prediction mode and a block context;
• generating a neural network-based predictor for the current coding block based on the block context and the neural network-based prediction mode;
• determining, based on a plurality of pixels that neighbor the current coding block, a non-neural network-based intra prediction mode that corresponds to the generated neural network-based predictor;
• determining an intra prediction index associated with the determined non-neural network-based intra prediction mode;
• adding the intra prediction index to a most probable mode (MPM) list of a neighboring block of the current coding block;
• determining a prediction mode for the neighboring block based on the MPM list;
• and
• decoding the neighboring block based on the prediction mode.

A method of video encoding, comprising:

• obtaining, for a current coding block, information representative of a neural network-based prediction mode and a block context;
• generating a neural network-based predictor for the current coding block based on the block context and the neural network-based prediction mode;
• determining, based on a plurality of pixels that neighbor the current coding block, a non-neural network-based intra prediction mode that corresponds to the generated neural network-based predictor;
• determining an intra prediction index associated with the determined non-neural network-based intra prediction mode;
• adding the intra prediction index to a most probable mode (MPM) list of a neighboring block of the current coding block;
• determining a prediction mode for the neighboring block based on the MPM list;
• and
• encoding the neighboring block based on the prediction mode.