According to one embodiment, an information processing device includes: an encoder including a first layer and a second layer which are coupled in series; and a decoder. The encoder is configured to: generate, based on first data, a first key and a first value in the first layer, and a second key and a second value in the second layer; and generate, based on second data different from the first data, a first query in the first layer, and a second query in the second layer. The decoder is configured to: generate third data which is included in the first data and is not included in the second data, based on the first key, the first value, the first query, the second key, the second value, and the second query.