Similar search queries and images

A system, comprising:

• one or more computers;
• and
• a computer-readable medium coupled to the one or more computers having instructions stored thereon which, when executed by the one or more computers, cause the one or more computers to perform operations comprising:
• generating, for each of a plurality of search queries, a selection vector for the search query, each selection vector including a plurality of vector elements, each vector element corresponding to a unique image, and the value of each vector element being a probability that the vector element's corresponding unique image will be selected in response to the unique image being presented as a search result for the search query;
• selecting a first search query and a second search query from the plurality of search queries;
• and
• determining, from selection vectors for the first and second search queries, a similarity measure that is a measurement of the similarity of the first search query to the second search query.

A non-transitory computer-readable medium storing machine instructions operable to cause one or more programmable processors to perform operations comprising:

• generating, for each of a plurality of search queries, a selection vector for the search query, each selection vector including a plurality of vector elements, each vector element corresponding to a unique image, and the value of each vector element being a probability that the vector element's corresponding unique image will be selected in response to the unique image being presented as a search result for the search query;
• selecting a first search query and a second search query from the plurality of search queries;
• and
• determining, from the selection vectors for the first and second search queries, a similarity measure that is a measurement of the similarity of the first search query to the second search query.