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Clojure

(ns examples.tpt
(:require [clojure.string :as string]
[clojure.java.io :as io]
[taoensso.tufte :as tufte :refer (defnp p profiled profile)]
[com.owoga.trie :as trie]
[com.owoga.tightly-packed-trie :as tpt]
[com.owoga.trie.math :as math]
[com.owoga.tightly-packed-trie.encoding :as encoding]
[com.owoga.prhyme.util :as util]
[com.owoga.prhyme.data.dictionary :as dict]
[clojure.zip :as zip]
[cljol.dig9 :as d]))
(tufte/add-basic-println-handler! {})
(defn xf-file-seq [start end]
(comp (remove #(.isDirectory %))
(drop start)
(take end)))
(defn dark-corpus-file-seq [start end]
(let [xf (comp (remove #(.isDirectory %))
(drop start)
(take end))
documents (file-seq (io/file "dark-corpus"))]
(transduce xf conj documents)))
(def re-word
"Regex for tokenizing a string into words
(including contractions and hyphenations),
commas, periods, and newlines."
#"(?s).*?([a-zA-Z\d]+(?:['\-]?[a-zA-Z]+)?|,|\.|\n)")
(defn pad-tokens
"Pads the beginning with n - 1 <s> tokens and
the end with 1 </s> token."
[tokens n]
(vec (concat (vec (repeat (max 1 (dec n)) "<s>")) tokens ["</s>"])))
(defn tokenize-line
[line]
(->> line
(string/trim)
(re-seq re-word)
(mapv second)
(mapv string/lower-case)))
(defn text->ngrams
"Takes text from a file, including newlines.
Pads lines with <s> and </s> for start/end of line.
Pads beginning with n - 1 <s>s"
[text n]
(->> text
util/clean-text
(#(string/split % #"\n+"))
(remove empty?)
(mapv tokenize-line)
(mapv #(pad-tokens % n))
(mapv #(partition n 1 %))
(mapv #(mapv vec %))
(reduce #(into %1 %2) [])))
(defn n-to-m-grams
"Exclusive of m, similar to range."
[n m text]
(loop [i n
r []]
(cond
(= i m)
r
:else
(recur (inc i)
(into r (text->ngrams text i))))))
(declare ->TrieKey)
(deftype TrieKey [key]
clojure.lang.IPersistentStack
(peek [self]
(let [x (last (seq self))]
(if (.equals "" x)
nil
(Integer/parseInt x))))
(pop [self]
(TrieKey. (string/replace key #"(.*):.*$" "$1")))
clojure.lang.ISeq
(first [self]
(let [x (first (seq self))]
(if (.equals x "")
nil
(Integer/parseInt x))))
(next [self]
(TrieKey. (string/replace key #".*?:(.*)" "$1")))
(more [self]
(let [xs (string/split key #":")]
(if (.equals xs "") '() (into (->TrieKey "") (rest xs)))))
(cons [self o]
(TrieKey.
(cond
(.equals key "") ":"
(.equals key ":") (str key o)
:else (str key ":" o))))
clojure.lang.IPersistentCollection
(count [self]
(count (seq self)))
(empty [self]
(TrieKey. ""))
(equiv [self o]
(.equals self o))
clojure.lang.Seqable
(seq [self]
(if (.equals "" key)
nil
(seq (string/split key #":")))))
(defmethod print-method TrieKey [trie-key ^java.io.Writer w]
(print-method (.key trie-key) w))
(defmethod print-dup TrieKey [trie-key ^java.io.Writer w]
(print-ctor trie-key (fn [o w] (print-dup (.key trie-key) w)) w))
(defn trie-key
([]
(->TrieKey ""))
([coll]
(->TrieKey (string/join ":" coll))))
(def trie-database (atom nil))
(defn stateful-transducer [xf]
(let [trie (volatile! (trie/make-trie))
database (atom {})
next-id (volatile! 1)]
(fn
([] (xf))
([result]
(reset! trie-database @database)
(xf result))
([result input]
(let [ngrams-ids
(mapv
(fn [ngrams]
(mapv
(fn [ngram]
(let [gram-ids (mapv
(fn [gram]
(let [gram-id (get @database gram @next-id)]
(when (.equals gram-id @next-id)
(swap! database
#(-> %
(assoc gram gram-id)
(assoc gram-id gram)))
(vswap! next-id inc))
gram-id))
ngram)
ngram-id (get database gram-ids @next-id)]
gram-ids))
ngrams))
input)]
(vswap!
trie
(fn [trie ngrams-ids]
(reduce
(fn [trie [ngram-ids _]]
(update trie ngram-ids (fnil #(update % 1 inc) [(peek ngram-ids) 0])))
trie
ngrams-ids))
ngrams-ids))))))
(defn prep-ngram-for-trie
"The tpt/trie expects values conjed into an ngram
to be of format '(k1 k2 k3 value)."
[ngram]
(clojure.lang.MapEntry. (vec ngram) ngram))
(defn seq-of-nodes->sorted-by-count
"Sorted first by the rank of the ngram, lowest ranks first.
Sorted second by the frequency of the ngram, highest frequencies first.
This is the order that you'd populate a mapping of keys to IDs."
[trie]
(->> trie
trie/children
(map #(get % []))
(sort-by :count)
reverse))
(comment
(time
(def trie
(transduce (comp (xf-file-seq 0 250000)
(map slurp)
(map (partial n-to-m-grams 1 4))
(map (fn [ngrams] (map #(prep-ngram-for-trie %) ngrams)))
stateful-transducer)
conj
(file-seq (io/file "dark-corpus")))))
(take 20 trie)
)
(defn encode-fn [v]
(let [[value count] (if (seqable? v) v [nil nil])]
(if (nil? value)
(encoding/encode 0)
(byte-array
(concat (encoding/encode value)
(encoding/encode count))))))
(defn decode-fn [db]
(fn [byte-buffer]
(let [value (encoding/decode byte-buffer)]
(if (zero? value)
nil
[value (encoding/decode byte-buffer)]))))
(comment
(time
(def tightly-packed-trie
(tpt/tightly-packed-trie
trie
encode-fn
(decode-fn @trie-database))))
)
(defn key-get-in-tpt [tpt db ks]
(let [id (map #(get-in db [(list %) :id]) ks)
v (get tpt id)]
{id v}))
(defn id-get-in-tpt [tpt db ids]
(let [ks (apply concat (map #(get db %) ids))
v (get tpt ids)
id (get-in db [ks :id])]
{ks (assoc v :value (get db id))}))
(comment
(tpt/save-tightly-packed-trie-to-file "dark-corpus-tpt.bin" tightly-packed-trie)
(def loaded-tightly-packed-trie (tpt/load-tightly-packed-trie-from-file
"dark-corpus-tpt.bin"
(decode-fn @trie-database)))
[(first tightly-packed-trie)
(first loaded-tightly-packed-trie)]
(take-last 10 (.array (.byte-buffer loaded-tightly-packed-trie)))
;; => (-127 -124 -42 -23 28 -127 -124 -41 -90 9)
;; => (0 0 0 0 0 37 0 6 -124 -56 -128 -121 1 -17 -128 -118 -117 -128 -115 2)
(take-last 10 (.array (.byte-buffer tightly-packed-trie)))
;; => (-127 -124 -42 -23 28 -127 -124 -41 -90 9)
;; => (0 0 0 0 0 37 0 6 -124 -56 -128 -121 1 -17 -128 -118 -117 -128 -115 2)
(.byte-buffer loaded-tightly-packed-trie)
;; => #object[java.nio.HeapByteBuffer 0x21b8291a "java.nio.HeapByteBuffer[pos=8 lim=2548630 cap=2548630]"]
(.byte-buffer tightly-packed-trie)
;; => #object[java.nio.HeapByteBuffer 0x7dc15357 "java.nio.HeapByteBuffer[pos=8 lim=2548630 cap=2548630]"]
[(.key loaded-tightly-packed-trie)
(.address loaded-tightly-packed-trie)
(.limit loaded-tightly-packed-trie)]
;; => [0 2424838 2548630]
[(.key tightly-packed-trie)
(.address tightly-packed-trie)
(.limit tightly-packed-trie)]
;; => [0 2424838 2548630]
(->> (trie/lookup tightly-packed-trie [1])
(trie/children)
(map #(get % []))
(remove nil?)
(math/weighted-selection #(nth % 1))
first
(@trie-database))
(with-open [wtr (clojure.java.io/writer "database.bin")]
(let [lines (->> (seq @trie-database)
(map pr-str)
(map #(str % "\n")))]
(doseq [line lines]
(.write wtr line))))
(def trie-database
(atom (with-open [rdr (clojure.java.io/reader "database.bin")]
(into {} (map read-string (line-seq rdr))))))
(profile
{}
(def example-story
(loop [generated-text [(get @trie-database "<s>")]
i 0]
(if (> i 20)
generated-text
(let [children (loop [i 4]
(let [node (p :lookup
(trie/lookup
loaded-tightly-packed-trie
(vec (take-last i generated-text))))
children (p :seq-children (and node (trie/children node)))]
(cond
(nil? node) (recur (dec i))
(< i 0) (throw (Exception. "Error"))
(seq children) children
:else (recur (dec i)))))]
(recur
(conj
generated-text
(->> children
(map #(get % []))
(remove nil?)
(#(p :weighted-selection (math/weighted-selection
(fn [[_ c]] c)
%)))
first))
(inc i)))))))
(->> example-story
(map (fn [v] (get-in @trie-database [v])))
(string/join " ")
(#(string/replace % #" ([\.,\?])" "$1"))
((fn [txt]
(string/replace txt #"(^|\. |\? )([a-z])" (fn [[a b c]]
(str b (.toUpperCase c)))))))
(key-get-in-tpt
tightly-packed-trie
trie-database
'("<s>" "<s>" "the"))
;; => {(2 2 3) {:value 3263, :count 462}}
(id-get-in-tpt
tightly-packed-trie
trie-database
'(2 2 3)))
;; => {("<s>" "<s>" "the") {:value ("<s>" "<s>" "the"), :count 462}}