PR fixing the issue #1391 (wrong contexts in the mgsm task)

[leocnj]

The issue reported in #1391 has been fixed.

For example, for mgsm_direct_en, new yaml file will be

!!@@##@@!! -- Example 1
Question: Roger has 5 tennis balls. He buys 2 more cans of tennis balls. Each can has 3 tennis balls. How many tennis balls does he have now?
Answer:Roger started with 5 balls. 2 cans of 3 tennis balls each is 6 tennis balls. 5 + 6 = 11. The answer is 11.

Question: If there are 3 cars in the parking lot and 2 more cars arrive, how many cars are in the parking lot?
Answer:There are 3 cars in the beginning, 2 more arrive, so now there should be 3 + 2 = 5 cars. The answer is 5.

Question: There were nine computers in the server room. Five more computers were installed each day, from monday to thursday. How many computers are now in the server room?
Answer:

For mgsm_native_cot_zh, the new yaml file will be

!!@@##@@!! -- Example 1
问题：罗杰有 5 个网球。他又买了 2 罐网球。每罐有 3 个网球。他现在有多少个网球？
逐步解答: 杰一开始有 5 个球。2 罐各 3 个网球就是 6 个网球。5 + 6 = 11。答案是 11。

问题：如果停车场里有 3 辆车，又来了 2 辆车，停车场里有多少辆车？
逐步解答: 开始有 3 辆车，又来了 2 辆，所以现在应该有 3 + 2 = 5 辆车。答案是 5。

问题：服务器机房里有九台电脑。从周一到周四，每天又安装了五台电脑。服务器机房里现在有多少台电脑？
逐步解答:

[CLAassistant]

All committers have signed the CLA.

[haileyschoelkopf]

Thanks very much for this PR! looks good to me, modulo the one nit I had on target delimiter.

Also flagging that we will want to re-look at MGSM to apply some of the better answer extraction from GSM in #1356 to it.

[haileyschoelkopf]

Thank you for this!

[thnkinbtfly]

Thanks very much for this PR! looks good to me, modulo the one nit I had on target delimiter.

Also flagging that we will want to re-look at MGSM to apply some of the better answer extraction from GSM in #1356 to it.

Working on it!