13. A computer system for document analysis, the computer system comprising: one or more computer processors; one or more computer readable storage media; and program instructions stored on the computer readable storage media for execution by at least one of the one or more processors, the program instructions comprising: program instructions to receive a request to translate a document; program instructions to determine usage information corresponding to the document, wherein the usage information includes information corresponding to a current viewing session of the document for a user, and a mode of usage corresponding to the current viewing session of the document, the mode of usage indicating user activity that corresponds to how the user is currently interacting with the document in the current viewing session of the document, and the mode of usage indicating at least a speed at which the user is scrolling through the document, and wherein the usage information includes historical usage information corresponding to one or more previous viewing sessions of the document; and program instructions to determine one or more sections of the document to translate based on the determined usage information corresponding to the document, wherein the program instructions to determine one or more sections of the document to translate based on the determined usage information corresponding to the document, further comprise program instructions to: determine a probability corresponding to each section of the one or more sections of the document that indicate the probability that a user will access and view a respective section of the document, wherein the probabilities are determined based on at least: the determined usage information corresponding to the document, data indicating relationships of sections of the document, and browsing history of the document; and determine the one or more sections of the document to translate, wherein the one or more sections of the document to translate each have a determined corresponding probability exceeding a minimum threshold condition.
13. A computer system for document analysis, the computer system comprising: one or more computer processors; one or more computer readable storage media; and program instructions stored on the computer readable storage media for execution by at least one of the one or more processors, the program instructions comprising: program instructions to receive a request to translate a document; program instructions to determine usage information corresponding to the document, wherein the usage information includes information corresponding to a current viewing session of the document for a user, and a mode of usage corresponding to the current viewing session of the document, the mode of usage indicating user activity that corresponds to how the user is currently interacting with the document in the current viewing session of the document, and the mode of usage indicating at least a speed at which the user is scrolling through the document, and wherein the usage information includes historical usage information corresponding to one or more previous viewing sessions of the document; and program instructions to determine one or more sections of the document to translate based on the determined usage information corresponding to the document, wherein the program instructions to determine one or more sections of the document to translate based on the determined usage information corresponding to the document, further comprise program instructions to: determine a probability corresponding to each section of the one or more sections of the document that indicate the probability that a user will access and view a respective section of the document, wherein the probabilities are determined based on at least: the determined usage information corresponding to the document, data indicating relationships of sections of the document, and browsing history of the document; and determine the one or more sections of the document to translate, wherein the one or more sections of the document to translate each have a determined corresponding probability exceeding a minimum threshold condition. 15. The computer system of claim 13 , wherein the information corresponding to a current viewing session of the document includes patterns of usage corresponding to the current session.