Class ConfusionMatrix
source code
object --+
|
ConfusionMatrix
The confusion matrix between a list of reference values and a
corresponding list of test values. Entry [r,t] of this matrix is a count of the number of times that
the reference value r corresponds to the test value
t. E.g.:
>>> ref = 'DET NN VB DET JJ NN NN IN DET NN'.split()
>>> test = 'DET VB VB DET NN NN NN IN DET NN'.split()
>>> cm = ConfusionMatrix(ref, test)
>>> print cm['NN', 'NN']
3
Note that the diagonal entries (Ri=Tj) of this matrix corresponds to correct values; and
the off-diagonal entries correspond to incorrect values.
|
|
__init__(self,
reference,
test,
sort_by_count=False)
Construct a new confusion matrix from a list of reference values and
a corresponding list of test values. |
source code
|
|
int
|
__getitem__(self,
(li, lj))
Returns:
The number of times that value li was expected and value
lj was given. |
source code
|
|
|
|
|
|
|
|
|
|
pp(self,
show_percents=False,
values_in_chart=True)
Returns:
A multi-line string representation of this confusion matrix. |
source code
|
|
|
|
|
|
Inherited from object:
__delattr__,
__getattribute__,
__hash__,
__new__,
__reduce__,
__reduce_ex__,
__setattr__
|
|
|
_values
A list of all values in reference or test.
|
|
|
_indices
A dictionary mapping values in self._values to their indices.
|
|
|
_confusion
The confusion matrix itself (as a list of lists of counts).
|
|
|
_max_conf
The greatest count in self._confusion (used for
printing).
|
|
|
_total
The total number of values in the confusion matrix.
|
|
|
_correct
The number of correct (on-diagonal) values in the matrix.
|
|
Inherited from object:
__class__
|
__init__(self,
reference,
test,
sort_by_count=False)
(Constructor)
| source code
|
Construct a new confusion matrix from a list of reference values and a
corresponding list of test values.
- Parameters:
reference (list) - An ordered list of reference values.test (list) - A list of values to compare against the corresponding reference
values. - Raises:
ValueError - If reference and length do not have the
same length. - Overrides:
object.__init__
|
__getitem__(self,
(li, lj))
(Indexing operator)
| source code
|
- Returns:
int
- The number of times that value
li was expected and
value lj was given.
|
|
repr(x)
- Overrides:
object.__repr__
- (inherited documentation)
|
__str__(self)
(Informal representation operator)
| source code
|
str(x)
- Overrides:
object.__str__
- (inherited documentation)
|
pp(self,
show_percents=False,
values_in_chart=True)
| source code
|
- Returns:
- A multi-line string representation of this confusion matrix.
|