8. The method of claim 1 , wherein: the set of audio samples includes two or more collected keyword audio samples; and the set of phoneme sequence candidates generated from decoding the two or more collected keyword audio samples include two or more phoneme sequence candidates; and the method including: integrating the phoneme sequence candidates into a linear structure, including: mapping the corresponding phonemes of the phoneme sequence candidates to an edge of the linear structure; and categorizing the edges corresponding to similar phonemes into a same slot of the linear structure, wherein the slots form a linear connection relation with each other; and selecting a path of the linear structure, wherein the phonemes corresponding to the edges of the selected path comprise the keyword phoneme sequence.
8. The method of claim 1 , wherein: the set of audio samples includes two or more collected keyword audio samples; and the set of phoneme sequence candidates generated from decoding the two or more collected keyword audio samples include two or more phoneme sequence candidates; and the method including: integrating the phoneme sequence candidates into a linear structure, including: mapping the corresponding phonemes of the phoneme sequence candidates to an edge of the linear structure; and categorizing the edges corresponding to similar phonemes into a same slot of the linear structure, wherein the slots form a linear connection relation with each other; and selecting a path of the linear structure, wherein the phonemes corresponding to the edges of the selected path comprise the keyword phoneme sequence. 9. The method of claim 8 , wherein selecting the path from the linear structure includes: calculating an occurrence frequency for the phoneme corresponding to each edge of the linear structure; calculating a score for each path of the linear structure by summing the occurrence frequencies of the phonemes corresponding to each edge in a respective path; sorting the scores for the paths of the linear structure from high to low, and selecting the first N paths as alternative paths, wherein N is an integer larger than 1; and calculating a confidence measure for each of the N alternative paths, and selecting one of the N alternative paths according to corresponding calculated confidences measures, wherein the phonemes corresponding to the edges of the selected one of the N alternative paths comprise the keyword phoneme sequence.