Node Connectivity
There are 174 nodes that can be used as predessesor
for a node with an input port of type 
org.knime.core.node.port.AbstractPortObject.
Scatter Plot (JFreeChart)
The node visualize the input data by putting each data point to the position on the plot (X and Y value).
Table to Image
Converts an image contained in a table row to an image object.
Hierarchical Cluster Assigner
Creates an interactive JavaScript which displays the results of hierarchical clustering and enables cluster assignment.
Decision Tree to Image
Renders a decision tree view on an image (PNG).
Simple Regression Tree Learner
Learns a single regression tree.
Simple Regression Tree Learner Deprecated
Learns a single regression tree.
Random Forest Learner Deprecated
Learns an ensemble of decision trees (such as random forest variants).
Tree Ensemble Learner Deprecated
Learns an ensemble of decision trees (such as random forest variants).
Random Forest Learner (Regression) Deprecated
Learns an ensemble of regression trees.
Tree Ensemble Learner (Regression) Deprecated
Learns an ensemble of regression trees.