ng_prepare_data is to be susceptible to rounding errors #72

Describe the bug

ValueError: Found conflicting aggregate metrics that need to be corrected:

• resources_servers/aviary/data/gsm8k_validation_metrics_conflict.json

$ diff gsm8k_validation_metrics.json gsm8k_validation_metrics_conflict.json
49c49
< "Median": 2988.5,

    "Median": 2988.5000000000005,

Steps/Code to reproduce bug

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A helpful guide on on how to craft a minimal bug report http://matthewrocklin.com/blog/work/2018/02/28/minimal-bug-reports.

Expected behavior

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Environment overview (please complete the following information)

• Environment location: [Bare-metal, Docker, Cloud(specify cloud provider - AWS, Azure, GCP, Collab)]
• Method of install: [pip install or from source]. Please specify exact commands you used to install.
• If method of install is [Docker], provide docker pull & docker run commands used

Environment details

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• OS version
• PyTorch version
• Python version

Additional context

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