Add garbage collector.

Have added the garbage collector to the generator.

Author: drvinceknight

axelrod/result_set.py

@@ -1,6 +1,7 @@
 from collections import defaultdict
 import csv
 import tqdm
+import gc
 
 from numpy import mean, nanmedian, std
 
@@ -899,6 +900,7 @@ def read_match_chunks(self, progress_bar=False):
                     yield repetitions
                     repetitions = []
                     count = 0
+                    gc.collect()
 
         if progress_bar:
             progress_bar.close()