Add CLI option for Error Grid interval

[sjvrijn]

This should also be included in the results folder naming scheme.

Since the Error Grids are not used for fixed strategy experiments, it can/should be omitted in those cases.
Once included when saving, it should also be included in the results parsing.

A small bit of WIP to implement this:

--- a/scripts/experiments/2020-11-05-simple-mfbo.py
+++ b/scripts/experiments/2020-11-05-simple-mfbo.py
@@ -91,8 +91,12 @@ def main(args):
         print(func.name)
 
         for idx, cost_ratio, experiment in product(range(args.niters), args.cost_ratio, args.experiment):
+
+            if experiment != 'fixed':
+                experiment = f'{experiment}-egi{args.eg_interval}'
             kwargs['seed_offset'] = idx
             kwargs['cost_ratio'] = cost_ratio
+            kwargs['eg_interval'] = args.eg_interval
             kwargs['run_save_dir'] = save_dir / FOLDER_NAME_TEMPLATE.format(
                 func_name=func.name,
                 name=experiment,
@@ -134,6 +138,8 @@ if __name__ == '__main__':
                         help="Stop optimization when optimum reached based on function's `x_opt`")
     parser.add_argument('--cache-models', action='store_true',
                         help="Cache models when building an error grid. NOTE: requires 200+GB RAM")
+    parser.add_argument('--eg-interval', type=int, default=[1], nargs='*',
+                        help="Error Grid Sampling interval, ignored . Default: 1")
     arguments = parser.parse_args()