python-3.xamazon-web-servicesamazon-comprehend

Calculate AWS Comprehend Sentiment cost

I'd like to programmatically estimate the cost to call the AWS Comprehend Sentiment API. I searched SO and the AWS calculators but couldn't find a way. Also, I'm sure the costs for the amount of text I'll be sending will be small but I really want to know.

Based on the pricing info here I wrote the code below. Is it correct?

text = ["What a horrible rainy day today", 
        "What a great day today", 
        "This is a neutral statement"]

numChars = sum(len(i) for i in text)

#Sentiment is measured in units of 100 characters, with a 3 unit (300 character) minimum charge per request.
numUnits = int(math.ceil(numChars / 100))

# Up to 10M units
if numUnits < 10000000:
    pricePerunit = 0.0001
    sentimentCost = numUnits * pricePerunit

# From 10M-50M units
elif numUnits >= 10000000 and numUnits <= 50000000:
    pricePerunit = 0.0001
    sentimentCost = 9999999 * pricePerunit

    pricePerunit = 0.00005
    sentimentCost = sentimentCost + ((numUnits - 10000000) * pricePerunit)

# Over 50M units.
elif numUnits > 50000000:
    pricePerunit = 0.0001
    sentimentCost = 9999999 * pricePerunit

    pricePerunit = 0.00005
    sentimentCost = sentimentCost + (40000000 * pricePerunit)

    pricePerunit = 0.000025
    sentimentCost = sentimentCost + ((numUnits - 49999999) * pricePerunit)

print("\nEstimated $ charges to call AWS Comprehend Sentiment are: %0.5f\n" % sentimentCost)
Solution

  • No, this calculation is not correct. Specifically: