question: return the number of non-zero elements in this vector . concode_field_sep double sq_gamma concode_elem_sep int[] keys concode_elem_sep double norm concode_elem_sep double[] values concode_elem_sep int size concode_elem_sep int total_size concode_field_sep double jaccard concode_elem_sep double qgram concode_elem_sep int intersection concode_elem_sep double[] toArray concode_elem_sep String toString concode_elem_sep int union concode_elem_sep void sampleDIMSUM concode_elem_sep double dotProduct concode_elem_sep double dotProduct concode_elem_sep double cosineSimilarity concode_elem_sep double norm
target: int function ( ) { return this . size ; }