Data-preserving text redaction for text utterance data

A system, comprising:

• one or more processors;
• and
• memory that stores computer-executable instructions that are executable by the one or more processors to cause the system to:
• determine a first portion of utterance data and a second portion of the utterance data, wherein the second portion is classified as including potentially sensitive information;
• obtain a hierarchical representation of a corpus of words;
• add noise to the hierarchical representation at a position corresponding to at least the second portion to obtain a different position of the hierarchical representation, the different position of the hierarchical representation corresponding to a word, wherein the noise is determined at least in part by simulating a plurality of random walks through a hyperbolic distribution of the hierarchical representation;
• replace the second portion with the word to form redacted utterance data;
• and
• provide the redacted utterance data to be processed.

A non-transitory computer-readable storage medium storing thereon executable instructions that, as a result of being executed by one or more processors of a computer system, cause the computer system to at least:

• determine a portion of stored utterance data;
• probabilistically determine a first word that is a hypernym of a second word of the portion, wherein the first word is probabilistically determined as a result of applying a noise value to a Hyperbolic word embedding at a first value, the first value corresponding to the second word;
• determine a redacted utterance at least in part by replacing the second word of the portion of the utterance data with the first word;
• and
• store the redacted utterance.