1. A method for data filtering, comprising: segmenting a to-be-detected vector to obtain k to-be-detected sub-vectors; respectively performing an inner product operation on the k to-be-detected sub-vectors and corresponding detection vectors among preset k detection vectors to obtain k first operation results; determining a first operation result, wherein a value of the operation result is a maximum among the k first operation results; obtaining an identifier of a detection vector corresponding to the first operation result, wherein the detection vector corresponding to the first operation result is in a one-to-one correspondence to an identifier; mapping the to-be-detected vector to a preset data filter according to the identifier of the detection vector corresponding to the first operation result; and determining, using the data filter, whether to filter out the to-be-detected vector.