>>> arwiki['metrics']
{'train': 0.745603, 'cv-train': 0.7466104, 'cv-test': 0.7256546}
>>> zhwiki['metrics']
{'train': 0.849384, 'cv-train': 0.8498268000000001, 'cv-test': 0.8434238000000001}
>>> plwiki['metrics']
{'train': 0.889403, 'cv-train': 0.8898400000000001, 'cv-test': 0.881623}
>>> nlwiki['metrics']
{'train': 0.880081, 'cv-train': 0.8805850000000001, 'cv-test': 0.8706782000000001}