Create a unique run directory
Create a new uniquely named run directory within the specified
unique_run_dir(runs_dir = getOption("tfruns.runs_dir", "runs"), seconds_scale = 0)
Directory containing runs. Defaults to "runs" beneath the
current working directory (or to the value of the
Decimal scale for the seconds component of the timestamp. Defaults to 0 which results in only the rounded seconds value being used in the timestamp. Specify larger numbers to include a decimal component (useful if you need to create many unique run directories at the same time).
The directory name will be a timestamp (in GMT time). If a duplicate name is generated then the function will wait long enough to return a unique one.