This chapter describes the input data file of the Evidence Visualizer. This file is a textual representation of the Evidence Classifier. The data file is generated automatically through the Tool Manager. In some instances you may want to edit this file in order to change label, attribute, or value names.
The Evidence Visualizer requires a data file containing the label and attributes, along with weights and probabilities. These are used to create the graphics. The data file is created when you run the Evidence Inducer using the Tool Manager. The format of the data file is:
#MineSet
<type> "<label>" <L>
"<label1>" <weight1> <probability1>
"<label2>" <weight2> <probability2>
:
"<labelL>" <weightL> <probabilityL>
<M>
<type> "<attrib1>" <N1> <importance1>
"<value1_1>" <weight1_1_1> <prob1_1_1> ... <weight1_1_L> <prob1_1_L>
"<value1_2>" <weight1_2_1> <prob1_2_1> ... <weight1_2_L> <prob1_2_L>
:
"<value1_N1>" <weight1_N1_1> <prob1_N1_1> ... <weight1_N1_L> <prob1_N1_L>
<type> "<attrib2>" <N2> <importance2>
"<value2_1>" <weight2_1_1> <prob2_1_1> ... <weight2_1_L> <prob2_1_L>
"<value2_2>" <weight2_2_1> <prob2_2_1> ... <weight2_2_L> <prob2_2_L>
:
"<value2_N2>" <weight2_N2_1> <prob2_N2_1> ... <weight2_N2_L> <prob2_N2_L>
:
:
:
"<attribM>" <NM> <importanceM>
"<valueM_1>" <weightM_1_1> <probM_1> ... <weightM_1_L> <probM_1_L>
"<valueM_1>" <weightM_2_1> <probM_2_2> ... <weightM_2_L> <probM_2_L>
:
"<valueM_NM>" <weightN1_NM_1> <probM_NM_1> ... <weightM_NM_L> <probM_NM_L>
history {
:
:
}
|
L is the number of label values, M is the number of attributes, and N is the number of values or bins for attribute i. The <>'s indicate variables. The actual file has numbers or strings. A NULL is considered a unique value if it is present in an attribute. If NULLs exist for an attribute, they always appear as the first value (that is, the first line following the attribute header) and are represented by “?”.
The <type> can be:
nominal, which is used for the label and currently implies a string-valued attribute (or an integer attribute).
enum, which is used for attributes binned in Tool Manager.
auto-enum, which is used for attributes that are discretized automatically by the inducer. If a type is not present, auto-enum is assumed.
Lines beginning with # are comments (and ignored by the program).
You can include an optional history section at the end of the file. It is used by the Tool Manager for drill through. Without this section, drill through is not possible (in the Evidence Visualizer or any other MineSet tool).
The weights are the number of records (or sum of weights) in the table with that particular attribute value (or range of values). Therefore, the sum of the weights for each attribute equals the total number of records in the table (unless record weighting was used). The probability is the number of weights for that attribute value divided by the total number of weights. If the data file was generated with Laplace correction turned on, the probability is only approximately the number of weights for that attribute value divided by the total number of weights. Thus, the probability value indicates the proportion of records with a particular label that have this attribute value instead of another value.
Data files must have an .eviviz extension. When starting the Evidence Visualizer, or when opening a file, you must specify the data file.
The following is a sample Evidence Visualizer data file, cars.eviviz. Windows users can find the file in the directory in which MineSet is installed, under the Examples\eviviz\examples directory. UNIX users find the file in /usr/lib/MineSet/eviviz/examples/cars.eviviz.
#MineSet #automatically generated NOMINAL "origin" 3 "Europe" 73 0.179803 "Japan" 79 0.194581 "US" 254 0.625616 6 AUTO_ENUM "mpg" 5 25.448 "?" 3 0.0410959 0 0 5 0.019685 "- 16.1" 0 0 0 0 87 0.34252 "16.1-21.05" 10 0.136986 5 0.0632911 77 0.30315 "21.05-30.95" 43 0.589041 28 0.35443 67 0.26378 "30.95+" 17 0.232877 46 0.582278 18 0.0708661 NOMINAL "cylinders" 5 29.1759 "8" 0 0 0 0 108 0.425197 "4" 66 0.90411 69 0.873418 72 0.283465 "6" 4 0.0547945 6 0.0759494 74 0.291339 "3" 0 0 4 0.0506329 0 0 "5" 3 0.0410959 0 0 0 0 AUTO_ENUM "horsepower" 4 22.3514 "?" 2 0.0273973 0 0 4 0.015748 "- 78.5" 40 0.547945 46 0.582278 25 0.0984252 "78.5-134" 31 0.424658 33 0.417722 131 0.515748 "134+" 0 0 0 0 94 0.370079 AUTO_ENUM "weightlbs" 4 28.5157 "- 2379.5" 43 0.589041 57 0.721519 30 0.11811 "2379.5-2959.5" 18 0.246575 22 0.278481 57 0.224409 "2959.5-3274" 9 0.123288 0 0 29 0.114173 "3274+" 3 0.0410959 0 0 138 0.543307 AUTO_ENUM "time_to_60" 3 10.0055 "- 13.45" 3 0.0410959 3 0.0379747 78 0.307087 "13.45-19.45" 52 0.712329 75 0.949367 162 0.637795 "19.45+" 18 0.246575 1 0.0126582 14 0.0551181 AUTO_ENUM "year" 1 2.84217e-14 "ignore" 73 1 79 1 254 1 |
Note that the sum of the probabilities corresponding to a particular label value for a given attribute always equals 1. Consider the attribute weightlbs, for label value US (the first one), we have .11811+.224409+.114173+.543307=1.0 . Also note that attributes mpg and horsepower have NULL values.
The eviviz datafile (*.eviviz) also accommodates loss matrices and optionally included Laplace factor. The next example .eviviz file contains both of these.
MineSet # MLC++ generated file for MineSet Evidence Visualizer. NOMINAL “edibility” 2 “edible” 5 0.621212121212 “poisonous” 3 0.378787878788 TOTAL 8 LAPLACE yes 0 LOSS 10 0 20 10 10000 0 3 NOMINAL “cap-shape” 6 47.6129309656 “bell” 1 0.195652173913 0 0.0333333333333 “conical” 0 0.0217391304348 0 0.0333333333333 “convex” 2 0.369565217391 2 0.566666666667 “flat” 2 0.369565217391 0 0.0333333333333 “knobbed” 0 0.0217391304348 1 0.3 “sunken” 0 0.0217391304348 0 0.0333333333333 NOMINAL “cap-surface” 4 27.8397591211 “fibrous” 2 0.386363636364 0 0.0357142857143 “grooves” 0 0.0227272727273 0 0.0357142857143 “scaly” 1 0.204545454545 2 0.607142857143 “smooth” 2 0.386363636364 1 0.321428571429 NOMINAL “cap-color” 10 47.6129309656 “brown” 1 0.18 1 0.264705882353 “buff” 0 0.02 0 0.0294117647059 “cinnamon” 0 0.02 0 0.0294117647059 “gray” 0 0.02 1 0.264705882353 “green” 0 0.02 0 0.0294117647059 “pink” 1 0.18 0 0.0294117647059 “purple” 0 0.02 0 0.0294117647059 “red” 1 0.18 0 0.0294117647059 “white” 1 0.18 1 0.264705882353 “yellow” 1 0.18 0 0.0294117647059 |
The Laplace matrix follows the form shown in the graphical user interface (GUI). See the description in the MineSet Enterprise Edition Reference Guide .