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The dataset is a PostgreSQL dump file, compressed with 7zip. Finding the primary language for each project was tricky, and the results are inexact. Language detection was done purely on the basis of file extension. The map between the strings in the "primary" field and languages is as follows: ActionScript: "as" C++: "cpp" C: "c" Clojure: "clj" C#: "cs" Erlang: "erl" Go: "go" Haskell: "hs" Java: "java" Javscript: "js" Lisp: "lisp" Lua: "lua" Objective C: "m" Objective J: "j" PHP: "php" Ruby: "rb" Perl: "pl" Python: "py" Scala: "scala" The schema is as follows: CREATE TABLE author_repos ( id integer NOT NULL, repo_id integer NOT NULL, author_id integer NOT NULL, count integer -- Total # commits ); CREATE TABLE authors ( id integer NOT NULL, name character varying(100) NOT NULL -- Author email ); CREATE TABLE commits ( id integer NOT NULL, repo_id integer NOT NULL, author_id integer NOT NULL, age integer NOT NULL, -- Commit age in seconds, with 0 being the time of the first commit to the project message text, deletions integer, -- lines deleted insertions integer, -- lines inserted lines integer, -- deletions + insertions files integer, -- Number of files touched hash character varying(42) -- SHA hash ); CREATE TABLE extensions ( id integer NOT NULL, repo_id integer NOT NULL, ext character varying(6) NOT NULL, -- file extension count integer -- total number of lines ); CREATE TABLE repos ( id integer NOT NULL, "user" character varying(100) NOT NULL, name character varying(100) NOT NULL, watchers integer, -- github watchers forks integer, -- github forks "primary" character varying(6), -- primary language, calculated from extensions start integer, -- first commit, seconds since epoch "end" integer, -- last commit, seconds since epoch commitcount integer, -- total commits authorcount integer, -- total authors insertions integer, -- total lines inserted deletions integer, -- total lines deleted lines integer -- insertions + deletions );