Aspects of the disclosure provide methods, apparatuses, and non-transitory computer-readable storage mediums for video encoding/decoding. Prediction information for a current block in a current picture is determined. The prediction information indicates that the current block is to be encoded in (1) an intra sub-partition (ISP) mode and (2) one of a planar intra prediction mode or a DC intra prediction mode. The current block is partitioned into a plurality of sub-partitions based on the ISP mode. Each sub-partition is associated with at least one different reference sample. Residual information for each sub-partition is generated based on the at least one different reference sample associated with the respective sub-partition. The current block is encoded based on the determined prediction information and the generated residual information of the plurality of sub-partitions.