AWS Rekonition custom label

I have a query regarding Amazon Rekognition Custom Labels. In amazon rekonition custom labels page it says "For the first three months of using of Amazon Rekognition Custom Labels, the AWS Free Tier includes up to 4 free inference hours and 10 free training hours per month." Free for the first 3 months and while i created the project in the custom label and trying to train the model it shows the message "You are charged for the amount of time it takes to successfully train your model and for the amount of time your model runs. You aren't charged if model training fails." Will it be free of cost or it will be charged.