Implementing sparse distributed memory

A device, comprising:

• first circuitry comprising a plurality of cells arranged in first subsets, each first subset comprising multiple cells of the plurality of cells of the first circuitry, wherein the first circuitry is configured to:
• receive a first input vector for a write operation;
• and
• calculate, according to a first match criterion, a similarity between the first subsets of the first circuitry and the first input vector;
• second circuitry coupled to the first circuitry and configured to output a first activation signal based on the first match criterion;
• and
• third circuitry coupled to the second circuitry and comprising cells arranged in second subsets, each cell of the third circuitry associated with a corresponding value, the third circuitry configured to:
• receive the first activation signal;
• and
• selectively activate one or more first selected subsets of the second subsets in response to the first activation signal by incrementing or decrementing the corresponding values of the cells of the one or more first selected subsets based on the first input vector.

A method, comprising:

• receiving, by a first circuitry of a device, a first input vector for a write operation, the first circuitry comprising a plurality of first subsets;
• calculating, by the first circuitry, a similarity between the first input vector and the plurality of first subsets according to a first match criterion;
• outputting, by a second circuitry coupled to the first circuitry, a first activation signal based on the first match criterion;
• receiving, by a third circuitry coupled to the second circuitry, the first activation signal;
• and
• selectively activating, by the third circuitry, one or more first selected subsets of second subsets of the third circuitry in response to the first activation signal, wherein the selective activation comprises incrementing or decrementing corresponding values of cells of the one or more first selected subsets based on the first input vector.