"Infinity" value as "origin" for a Gauss function, scores NaN


(Nicola Dalmasso) #1

I have to score a property (download allowance for a broadband package
expressed in GB) which can have values like 1, 2, 10, 20 and Infinity.
I want to use a Gauss scoring function.

{
"gauss":{
"services.Broadband.downloadAllowance.value":{
"origin":"Infinity",
"scale":50
}
}
}

the _explain api returns this:

  • {
    • "value": "NaN",
    • "description": "function score, product of:",
    "details": [
    -
    {
    - "value": 1,
    - "description": "match filter: :"
    },
    -
    {
    - "value": "NaN",
    - "description": "Function for field
    services.Broadband.downloadAllowance.value:",
    -
    "details": [
    -
    {
    - "value": "NaN",
    - "description": "exp(-0.5*pow(MIN of:
    [Math.max(Math.abs(Infinity(=doc value) - Infinity(=origin))) -
    0.0(=offset), 0)],2.0)/1803.3688011112042)"
    }
    ]
    }
    ]
    }

It does recognize the Infinity word (it parses the query correctly) but
produces a NaN score.

Any suggestion to the approach to use?

For the sake of completeness, we are using a workaround, using another
field with a value of 999 when the value is Infinity, so the Gauss curve
works properly, but it's a workaround and we would like to be able to deal
with the "Infinity" value, which works great in Js.

Thanks for your time!

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(system) #2