Gradient chart view for regression solutions

[bburlacu]

As the name suggests, this view contains a chart plotting the gradient of the target variable with respect to a chosen input variable. The user may then vary the input value (by means of mouse interaction with the chart) in order to see how the target response changes.

The gradient chart supports synchronisation of backing data using a shared modifiable dataset, allowing the user to get a complete view of the target variation by arranging side by side multiple charts corresponding to different input variables.

Additional features:

• Responses for variables that are not used in the model should be grayed-out or hidden. Thos, methods for querying the actual used inputs for a regression model are implemented.
• If a model can estimate the variance of a sample (e.g. Gaussian process), the confidence interval should be shown.

Example gradient chart:

Known issues of the RegressionSolutionTargetResponseGradientView:

• Zooming does not realign the density information.
• Resizing with enabled density information will not update the density information and the density chart may be incorrectly aligned with the gradient chart. Re-checking a variable or changing the density combo box fixes this.
• Resizing do not change the height of the GradientCharts, to achieve the default 4/3 width/height-aspect any variable can be re-checked.
• Drag/Drop an additional solution onto a GradientChart does not update all other GradientCharts in the TargetResponseView.

[bburlacu]

r13780: Initial commit implementing gradient view and chart.

[bburlacu]

r13783: Fix text annotations.

[bburlacu]

r13808: Start implementing table layout panel for gradient charts in a separate view.

[pfleck]

r13810: Branched HeuristicLab.Algorithms.DataAnalysis.Views plugin. r13811: Updated project references.

[pfleck]

r13812: Added an new View for GaussianProcessSolutions to be able to interactively show the gradients and confidence intervals for user-input ranges.

[pfleck]

r13816:

• Fixed typo in class/filename.
• Added new control that shows density information adjacent to the trackbar.

[bburlacu]

r13817: Added RegressionSolutionTargetResponseGradientView and updated GradientChart.

[bburlacu]

r13818: Fixed small bug when the values are not correctly rendered in the chart initially. removed unused variable limits from view.

[pfleck]

r13819 Branched HeuristicLab.Algorithms.DataAnalysis and HeuristicLab.Problems.DataAnalysis.

[bburlacu]

r13820: Added flags for controlling the display of legend, axis labels, or vertical cursor on the chart.

[pfleck]

r13823:

• Added new interface IConfidenceBoundRegressionModel and IConfidenceBoundRegressionSolution for regression models/solutions that support confidence information on estimated samples.
• Renamed GetEstimatedVariance to GetEstimatedVariances to be consistent with GetEstimatedValues.

[pfleck]

r13824:

• Added new Model property in IConfidenceBoundRegressionSolution.
• Added ConfidenceBoundRegressionSolution base and methods to it from GaussianProcessRegressionSolution.
• Replaced RegressionSolutionGradientView with GaussianProcessRegressionSolutionInteractiveRangeEstimatorView. Also moved DensityTrackbar to Problems.DataAnalysis.Views Plugin.
• DensityTrackbar initial position is now where the density is highest.

[bburlacu]

r13825: Fix small bug showing the vertical annotation.

[bburlacu]

r13828: Simplify code and ensure charts are sorted according to the variable order in the list view.

[bburlacu]

r13829: Speed up response calculation in the GradientChart by using an internal dataset to store variable values.

[bburlacu]

r13830: Removed unused Configure method in the GradientChart.

[pfleck]

r13831

• merged recent trunk changes for GetUsedVariablesForPrediction method.
• Merged chart from RegressionSolutionGradientView and existing GradientChart.
• Used the GradientChart in the RegressionSolutionGradientView.

[pfleck]

r13836 Implemented correct coloring when multiple solutions are added for comparison with respect potential overlapping confidence intervals.

[pfleck]

r13837:

• Reverted UpdateAutomatically property.
• Made UpdateChart method async to avoid blocking the GUI thread.
• Changed Content type of RegressionSolutionGradientView to IRegressionSolution.

[pfleck]

r13840 Implemented cancellation of chart update when new update is called during calculation.

[pfleck]

r13842

• Reduced memory consumption greatly by reusing existing datapoints from existing series instead of creating new series on update.
• Rearranged methods and properties in GradientChart.
• Added properties to set fixed axis limits instead of calculation.

[pfleck]

r13843 Implemented "sync" y-axis for Target Response Gradient View.

[pfleck]

r13845

• All used variables of a model are initially checked when opening the Target Response Gradient View.
• Fixed a bug on axis scaling.

[pfleck]

r13846

• Added a manual y-axis control.
• Fixed bug with dragging the cursor in the GradientChart out of the chart.

[pfleck]

r13850

• Extracted DensityChart from DensityTrackbar.
• Added DensityChart to RegressionSolutionTargetResponseView with different options (none/training/test/all).
• Moved RegressionSolutionGradientView and RegressionSolutionTargetResponseView to subfolder.

[pfleck]

r13853

• Added GradientChartConfigurationDialog to allow setup x/y axis and drawing steps.
• Added "calculating pending"-icon only after 100ms to avoid flickering.
• Fixed some small issues.

[pfleck]

r13855

• Added validation in GradientChartConfigurationDialog and DensityTrackbar.
• Added optional configuration button for GradientChart.

[pfleck]

r13856

• Generalized GaussianProcessRegressionSolution...Views to ConfidenceBasedRegressionSolution...Views.
• Added "all" column for variances.