Hierarchical encoding of time-series data features

A non-transitory computer readable storage medium encoding instructions thereon that, in response to execution by a computer device, cause the computing device to perform operations comprising:

• identifying, by the computing device, a first codeword in a first level codebook to represent short-timescale information of frames in a time-based data item segmented at intervals;
• identifying a second codeword in a second level codebook to represent long-timescale information of the frames;
• determining, for each frame, a tensor product of the first codeword and the second codeword of the corresponding frame;
• and
• generating a third codebook based on the tensor products to add long-timescale information context to the short-timescale information of the frames.

A computing device comprising:

• a memory;
• and
• a processor coupled to the memory, wherein the processor is configured to:
• identify a first codeword in a first codebook to represent short-timescale information of frames in a time-based data item segmented at intervals;
• identify a second codeword in a second codebook to represent long-timescale information of the frames;
• and
• generate a third codebook based on the first codeword and the second codeword for the frames to add long-timescale information context to the short-timescale information of the frames.

A method comprising:

• computing, by a computing device, a short-timescale vectorial representation for frames in a time-based data item segmented at intervals;
• creating at least one long-timescale vectorial representation for the frames in the time-based data item;
• and
• identifying, for the frames in the time-based data item, codewords in a codebook using the short-timescale vectorial representation and the at least one long-timescale vectorial representation for a corresponding frame;
• and
• generating a contextual representation of the time-based data item using the codewords for the frames to represent structure of the short-timescale information of the time-based data item in context of the long-timescale information of the time-based data item.