Linear pool method

[lshandross]

No description provided.

[elray1]

For running unit tests, it may be necessary to modify the github workflow file to install dependencies. There is an example along these lines here.

[eahowerton]

One small detail to check:
If I understand correctly, simple_ensemble() will only calculate the linear pool ensemble correctly for cdf and pmf when they are defined on the same output_type_id values for all models. I don't see a check included in validate_ensemble_inputs() for this, but perhaps it's being validated somewhere else (if so, apologies and please ignore this comment!)

[elray1]

Thanks, Emily! You're right, we need to check that and we don't right now. We will add it :)

[elray1]

Notes on how to do the validation Emily suggested:

• Separate function that does this check, called from validate_ensemble_inputs
• What this function validates:
  • Within each group defined by a combination of values for task id variables and output type, all models provided the same set of output type ids.
  • Check only applies to the cdf, pmf, and quantile output types. It is required for these types to ensure that the resulting distribution is valid (i.e., cdf values are increasing, pmf values sum to 1, and there is not quantile crossing). The check is not relevant to the mean, median, and sample types.

[elray1]

misc minor updates