Use TableRef instead of copying tables all the time

src/nim_word_prediction.nim

@@ -3,8 +3,8 @@ import parseopt, tables, strutils
 import neo
 
 proc predict(word:string, matrix:Matrix[uint16],
-             word2int:Table[string, int],
-             int2word:Table[int, string]):string =
+             word2int:TableRef[string, int],
+             int2word:TableRef[int, string]):string =
   if not word2int.hasKey(word):
     return ""
   let
@@ -20,8 +20,8 @@ proc predict(word:string, matrix:Matrix[uint16],
   return int2word[maxI]
 
 proc updateMatrix(matrix:var Matrix[uint16], word1:string, word2:string,
-                  word2int:var Table[string, int],
-                  int2word:var Table[int, string]) =
+                  word2int:var TableRef[string, int],
+                  int2word:var TableRef[int, string]) =
   if not word2int.hasKey(word1):
     let newIndex = len(word2int)
     word2int[word1] = newIndex
@@ -37,8 +37,8 @@ proc updateMatrix(matrix:var Matrix[uint16], word1:string, word2:string,
     matrix[w1, w2] += 1
 
 proc interactive(matrix:Matrix[uint16],
-                 word2int:Table[string, int],
-                 int2word:Table[int, string]) =
+                 word2int:TableRef[string, int],
+                 int2word:TableRef[int, string]) =
   echo "-= Interactive prediction =-"
   for line in stdin.lines:
     echo predict(line, matrix, word2int, int2word)
@@ -51,8 +51,8 @@ proc main() =
     word = "I"
     texts:seq[string]
     matrix = zeros(20000, 20000, uint16)
-    word2int = initTable[string, int]()
-    int2word = initTable[int, string]()
+    word2int = newTable[string, int]()
+    int2word = newTable[int, string]()
 
   # Parse arguments
   while true: