Computes the co-occurrences present in the documents in the input directory and writes the {@link SemanticSpace} to the provided writer.
@param inputDirs one or more a directories in the Hadoop file system thatcontain all the documents to process
@param writer a writer to which the output {@link SemanticSpace} will bewritten upon completion of the map-reduce analysis.
@throws Exception if any exception occurs during the Hadoop processing orwhen writing the {@link SemanticSpace}
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