[💡SUG] Metrics for each session

[rowedenny]

Is your feature request related to a problem? Please describe. To make the significance testing, we need to outcome the metrics for each session separately and then do the significance testing. Yet, currently, the metrics are reported for a whole dataset.

Describe the solution you'd like Output a vector of metrics by each session

[2017pxy]

@rowedenny Hi, thanks for your suggestion. We will consider this feature in the future.