The present disclosure provides a point cloud encoding method and system, a point cloud decoding method and system, a point cloud encoder, and a point cloud decoder. A prediction mode of attribute information of a current point is determined through geometric information of a point in a point cloud, so that a determination process of the prediction mode is decoupled from a reconstruction process of the attribute information of the point in the point cloud, the two processes can be performed in parallel, and thus the efficiency of encoding and decoding is improved.

Embodiments of this application disclose a data compression method and apparatus, a computer device, and a storage medium, and belong to the field of data storage technologies. The method includes: obtaining a to-be-compressed data stream, where the data stream includes a plurality of pieces of data; determining a plurality of types of data from the plurality of pieces of data based on context information of each of the plurality of pieces of data, where each of the plurality of types of data includes at least one of the plurality of pieces of data, or the context information of each piece of data indicates data before and/or after corresponding data in the data stream; and compressing at least one of the plurality of types of data.

An output stream can be generated of compressed textual data. A first portion of the output stream includes an indicator that compression is used and a second portion is the compressed textual data. The textual data can be compressed by processing each byte of an input text bit-by-bit in order from most significant bit to least significant bit to generate an n-byte length context and a word context. While processing each byte, a subsequent bit is predicted based on the n-byte length context and a corresponding prediction model, and the subsequent bit is predicted based on the word context and a corresponding prediction model. The predictions can be combined to generate a final prediction. If the final prediction determines the subsequent bit, then the subsequent bit can be skipped in the output stream. The output stream can be provided to another device over a communication interface.