Multiple control flow issues in ParameterInputDialog of Swan Implementation

[shashwatsridhar]

In the current implementation, the ParameterInputDialog for the Swan Implementation has three buttons - Cancel, Update Plot and Calculate. For one run of the algorithm, the Update Plot button must be clicked first in order to instantiate different Kmeans Solvers, and only then should the Calculate button be clicked. This is not clear from the design of the GUI itself, it's worth:

• greying out the Calculate button until the Update Plot is clicked (and the Solvers are successfully calculated)

Additionally, should be fixed so that the chosen_solver is not looked for unless _solvers is an empty list. It should essentially read:

if not self._solvers:

This should also fix the error which is raised when Cancel is pressed in the ParameterInputDialog.