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# -*- coding: utf-8 -*-
"""MultiLabelCM module."""
from __future__ import division
from .errors import pycmVectorError, pycmMultiLabelError
from .params import *
from .cm import ConfusionMatrix
import numpy
class MultiLabelCM():
"""
Multilabel confusion matrix class.
>>> mlcm = MultiLabelCM([{'dog'}, {'cat', 'dog'}], [{'cat'}, {'cat'}])
>>> mlcm.actual_vector_multihot
[[0, 1], [1, 1]]
>>> mlcm.predict_vector_multihot
[[1, 0], [1, 0]]
"""
def __init__(
self,
actual_vector,
predict_vector,
sample_weight=None,
classes=None):
"""
Init method.
:param actual_vector: actual vector
:type actual_vector: python list or numpy array of sets
:param predict_vector: vector of predictions
:type predict_vector: python list or numpy array of sets
:param sample_weight: sample weights list
:type sample_weight: python list or numpy array
:param classes: ordered labels of classes
:type classes: list
"""
self.actual_vector = actual_vector
self.actual_vector_multihot = []
self.predict_vector = predict_vector
self.predict_vector_multihot = []
self.weights = None
self.classes = None
self.classwise_cms = {}
self.samplewise_cms = {}
__mlcm_vector_handler__(
self,
actual_vector,
predict_vector,
sample_weight,
classes)
__mlcm_assign_classes__(self, classes)
__mlcm_vectors_filter__(self)
def get_cm_by_class(self, class_name):
"""
Return confusion matrices based on classes.
:param class_name: target class name for confusion matrix
:type class_name: any valid type
:return: confusion matrix corresponding to the given class name
"""
if class_name not in self.classwise_cms:
try:
class_index = self.classes.index(class_name)
except ValueError:
raise pycmMultiLabelError(INVALID_CLASS_NAME_ERROR)
actual_vector_temp = []
predict_vector_temp = []
for item1, item2 in zip(
self.actual_vector_multihot, self.predict_vector_multihot):
actual_vector_temp.append(item1[class_index])
predict_vector_temp.append(item2[class_index])
cm = ConfusionMatrix(
actual_vector_temp,
predict_vector_temp,
sample_weight=self.weights)
self.classwise_cms[class_name] = cm
return cm
return self.classwise_cms[class_name]
def get_cm_by_sample(self, index):
"""
Return confusion matrices based on samples.
:param index: sample index for confusion matrix
:type index: int
:return: confusion matrix corresponding to the given sample number
"""
if index < 0 or index >= len(self.actual_vector):
raise pycmMultiLabelError(VECTOR_INDEX_ERROR)
if index not in self.samplewise_cms:
cm = ConfusionMatrix(
self.actual_vector_multihot[index],
self.predict_vector_multihot[index],
sample_weight=self.weights)
self.samplewise_cms[index] = cm
return cm
return self.samplewise_cms[index]
def __str__(self):
"""
Multilabel confusion matrix object string representation method.
:return: representation as str
"""
return self.__repr__()
def __repr__(self):
"""
Multilabel confusion matrix object representation method.
:return: representation as str
"""
return "pycm.MultiLabelCM(classes: " + str(self.classes) + ")"
def __len__(self):
"""
Multilabel confusion matrix object length method.
:return: length as int
"""
return len(self.classes)
def __mlcm_vector_handler__(
mlcm,
actual_vector,
predict_vector,
sample_weight,
classes):
"""
Handle multilabel object conditions for vectors.
:param mlcm: multilabel confusion matrix
:type mlcm: pycm.MultiLabelCM object
:param actual_vector: actual vector
:type actual_vector: python list or numpy array of sets
:param predict_vector: vector of predictions
:type predict_vector: python list or numpy array of sets
:param sample_weight: sample weights list
:type sample_weight: python list or numpy array
:param classes: ordered labels of classes
:type classes: list
:return: None
"""
if not isinstance(actual_vector, (list, numpy.ndarray)) or not \
isinstance(predict_vector, (list, numpy.ndarray)):
raise pycmVectorError(VECTOR_TYPE_ERROR)
if len(actual_vector) != len(predict_vector):
raise pycmVectorError(VECTOR_SIZE_ERROR)
if len(actual_vector) == 0 or len(predict_vector) == 0:
raise pycmVectorError(VECTOR_EMPTY_ERROR)
if not all(map(lambda x: isinstance(x, set), actual_vector)):
raise pycmVectorError(NOT_ALL_SET_VECTOR_ERROR)
if not all(map(lambda x: isinstance(x, set), predict_vector)):
raise pycmVectorError(NOT_ALL_SET_VECTOR_ERROR)
if classes is not None and len(set(classes)) != len(classes):
raise pycmVectorError(VECTOR_UNIQUE_CLASS_ERROR)
if isinstance(sample_weight, (list, numpy.ndarray)):
mlcm.weights = sample_weight
def __mlcm_assign_classes__(
mlcm,
classes):
"""
Assign multilabel object class.
:param mlcm: multilabel confusion matrix
:type mlcm: pycm.MultiLabelCM object
:param classes: ordered labels of classes
:type classes: list
:return: None
"""
mlcm.classes = classes
if classes is None:
mlcm.classes = sorted(
list(
set.union(
*mlcm.actual_vector,
*mlcm.predict_vector)))
def __mlcm_vectors_filter__(mlcm):
"""
Normalize multilabel object vectors.
:param mlcm: multilabel confusion matrix
:type mlcm: pycm.MultiLabelCM object
:param classes: ordered labels of classes
:type classes: list
:return: None
"""
mlcm.actual_vector_multihot = [__set_to_multihot__(
x, mlcm.classes) for x in mlcm.actual_vector]
mlcm.predict_vector_multihot = [__set_to_multihot__(
x, mlcm.classes) for x in mlcm.predict_vector]
def __set_to_multihot__(input_set, classes):
"""
Convert a set into a multi-hot vector based in classes.
:param input_set: input set
:type input_set: set
:param classes: ordered labels of classes
:type classes: list
:return: multi-hot vector as a list
"""
result = [0] * len(classes)
for i, x in enumerate(classes):
if x in input_set:
result[i] = 1
return result
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