Question about NaN GPU counts and End Times

[ChamiLamelas]

Question 1:

In pai_task_table, I have noticed that 223965 of the 1261050 rows have NaN plan_gpu values.

Is there a reason for these values being marked as NaN? Is there any additional information that can be obtained from this?

It seems in cluster-trace-gpu-v2020/analysis/analysis.ipynb that these rows are dropped from analysis.

Question 2:

I noticed that 299948 other rows have NaN end_time values. This set of rows includes failed tasks.

For those failed tasks, what does a NaN end_time mean?