add baseline mean from train

baseline_mean_from_train/run.py

@@ -0,0 +1,14 @@
+import pandas as pd
+
+r = pd.read_csv('../train/expected.tsv', header = None)
+mean = str(float(r.mean()))
+
+with open('dev-0/out.tsv','w') as f_out, open('../dev-0/in.tsv', 'r') as f_in:
+    pass
+    for line in f_in:
+        f_out.write(mean + '\n')
+
+with open('test-A/out.tsv','w') as f_out, open('../test-A/in.tsv', 'r') as f_in:
+    pass
+    for line in f_in:
+        f_out.write(mean + '\n')