Changeset 7746:05b4e722448a in orange for orange/orngLookup.py


Ignore:
Timestamp:
03/15/11 15:43:30 (3 years ago)
Author:
lanz <lan.zagar@…>
Branch:
default
Convert:
4b7de0e1176842447ddbc886c83a82306226a81e
Message:

Emptied orngLookup.py and linked to Orange.classification.lookup.

File:
1 edited

Legend:

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Added
Removed
  • orange/orngLookup.py

    r1 r7746  
    1 import orange, orngMisc 
    2  
    3 def lookupFromBound(attribute, bound): 
    4     if not len(bound): 
    5         raise TypeError, "no bound attributes" 
    6     elif len(bound)<=3: 
    7         return apply([orange.ClassifierByLookupTable, orange.ClassifierByLookupTable2, orange.ClassifierByLookupTable3][len(bound)-1], [attribute] + list(bound)) 
    8     else: 
    9         return None 
    10  
    11      
    12 def lookupFromFunction(attribute, bound, function): 
    13     """ 
    14     Constructs ClassifierByExampleTable or ClassifierByLookupTable mirroring the given function 
    15     """ 
    16     lookup = lookupFromBound(attribute, bound) 
    17     if lookup: 
    18         lookup.lookupTable = [orange.Value(attribute, function(attributes)) for attributes in orngMisc.LimitedCounter([len(attr.values) for attr in bound])] 
    19         return lookup 
    20     else: 
    21         examples = orange.ExampleTable(orange.Domain(bound, attribute)) 
    22         for attributes in orngMisc.LimitedCounter([len(attr.values) for attr in dom.attributes]): 
    23             examples.append(orange.Example(dom, attributes + [function(attributes)])) 
    24         return orange.LookupLearner(examples) 
    25        
    26  
    27 def lookupFromExamples(examples, weight = 0, learnerForUnknown = None): 
    28     if len(examples.domain.attributes) <= 3: 
    29         lookup = lookupFromBound(examples.domain.classVar, examples.domain.attributes) 
    30         lookupTable = lookup.lookupTable 
    31         for example in examples: 
    32             ind = lookup.getindex(example) 
    33             if not lookupTable[ind].isSpecial() and (lookupTable[ind] <> example.getclass()): 
    34                 break 
    35             lookupTable[ind] = example.getclass() 
    36         else: 
    37             return lookup 
    38  
    39         # there are ambiguities; a backup plan is ClassifierByExampleTable, let it deal with them 
    40         return orange.LookupLearner(examples, weight, learnerForUnknown = learnerForUnknown) 
    41  
    42     else: 
    43         return orange.LookupLearner(examples, weight, learnerForUnknown = learnerForUnknown) 
    44          
    45          
    46 def printLookupFunction(func): 
    47     if isinstance(func, orange.Variable): 
    48         if not func.getValueFrom: 
    49             raise TypeError, "attribute '%s' does not have an associated function" % func.name 
    50         else: 
    51             func = func.getValueFrom 
    52  
    53     outp = "" 
    54     if isinstance(func, orange.ClassifierByExampleTable): 
    55     # XXX This needs some polishing :-) 
    56         for i in func.sortedExamples: 
    57             outp += "%s\n" % i 
    58     else: 
    59         boundset = func.boundset() 
    60         for a in boundset: 
    61             outp += "%s\t" % a.name 
    62         outp += "%s\n" % func.classVar.name 
    63         outp += "------\t" * (len(boundset)+1) + "\n" 
    64          
    65         lc = 0 
    66         if len(boundset)==1: 
    67             cnt = orngMisc.LimitedCounter([len(x.values)+1 for x in boundset]) 
    68         else: 
    69             cnt = orngMisc.LimitedCounter([len(x.values) for x in boundset]) 
    70         for ex in cnt: 
    71             for i in range(len(ex)): 
    72                 if ex[i]<len(boundset[i].values): 
    73                     outp += "%s\t" % boundset[i].values[ex[i]] 
    74                 else: 
    75                     outp += "?\t", 
    76             outp += "%s\n" % func.classVar.values[int(func.lookupTable[lc])] 
    77             lc += 1 
    78     return outp 
     1import orange 
     2from Orange.classification.lookup import \ 
     3     lookup_from_bound as lookupFromBound, \ 
     4     lookup_from_function as lookupFromFunction, \ 
     5     lookup_from_data as lookupFromExamples, \ 
     6     dump_lookup_function as printLookupFunction 
    797 
    808 
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