Compensation scheme for analog in-memory matrix multiplication

A computer-implemented method comprising:

• mapping values of a matrix to conductance values of a memory crossbar array;
• inputting, to memory cells of the memory crossbar array, analog voltage values of an activation vector;
• generating non-linear output values from the analog voltage values and the mapped conductance values;
• generating, via the memory cells of the memory crossbar array, time varying voltage values;
• and
• using the time varying voltage values to linearize the analog non-linear output values into analog linear output value and converting the analog linear output values to digital linear output values.

A computer program product comprising:

• one or more computer-readable storage media;
• and
• program instructions stored on the one or more computer-readable storage media to perform operations comprising:
• mapping values of a matrix to conductance values of a memory crossbar array;
• inputting, to the memory cells of the memory crossbar array, analog voltage values of an activation vector;
• generating non-linear output values from the analog voltage values and the mapped conductance values;
• generating, via the memory cells of the memory crossbar array, time varying voltage values;
• and
• using the time varying voltage values to linearize the analog non-linear output values into analog linear output value and converting the analog linear output values to digital linear output values.

A computing device comprising:

• a memory crossbar array comprising a plurality of columns of memory cells, each memory cell configured to store a value of a matrix to a conductance, the plurality of columns of memory cells comprising:
• groups of columns of memory cells, each column of memory cells in a group of memory cells configured to generate a non-linear output value from stored values of the matrix and analog input values of a vector;
• and
• dummy columns of memory cells, interleaved between and separate from the groups of columns of memory cells, each dummy column configured to generate a time varying voltage value for a portion of the groups of columns of memory cells adjacent to a corresponding dummy column;
• control logic circuitry configured to execute, via the plurality of columns of memory cells, analog in-memory computing for matrix vector multiplication by controlling each column of memory cells to:
• generate the non-linear output value from the stored values of the matrix and the analog input values of the vector;
• and
• generate, the time varying voltage value for the portion of the groups of columns of memory cells adjacent to the corresponding dummy column;
• and
• a plurality of analog to digital converters configured to use the time varying voltage values to linearize the non-linear output values into analog linear output values and convert the analog linear output values to digital linear output values.

A method comprising:

• configuring a memory crossbar array, comprising a plurality of columns of memory cells, to store a value of a matrix to a conductance in each memory cell;
• for the plurality of columns of memory cells, configuring each column of memory cells in a group of memory cells to generate a non-linear output value from the stored values of the matrix and analog input values of a vector;
• configuring each of a plurality of dummy columns of memory cells, interleaved between and separate from the groups of columns of memory cells, to generate a time varying voltage value for a portion of the groups of columns of memory cells adjacent to a corresponding dummy column;
• executing, via the plurality of columns of memory cells, analog in-memory computing for matrix vector multiplication by controlling:
• each column of memory cells to generate the non-linear output value from the stored values of the matrix and the analog input values of the vector;
• and
• each dummy column to generate, the time varying voltage value for the portion of the groups of columns of memory cells adjacent to the corresponding dummy column;
• and
• using the time varying voltage values to linearize the analog non-linear output values into analog linear output values and convert the analog linear output values to digital linear output values.