CN106250924A - A kind of newly-increased category detection method based on multi-instance learning - Google Patents

A kind of newly-increased category detection method based on multi-instance learning Download PDF

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CN106250924A
CN106250924A CN201610600041.3A CN201610600041A CN106250924A CN 106250924 A CN106250924 A CN 106250924A CN 201610600041 A CN201610600041 A CN 201610600041A CN 106250924 A CN106250924 A CN 106250924A
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吴建鑫
魏秀参
叶翰嘉
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Nanjing University
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Abstract

The present invention discloses a kind of newly-increased category detection method based on multi-instance learning, and the crucial example in many examples " being wrapped " first with crucial example detection algorithm more ripe in multi-instance learning extracts;Afterwards, for each known class, the crucial example of its correspondence being combined into one " the super bag of classification ", all examples not simultaneously being identified as crucial example form one " the super bag of unit ";Subsequently, the distance wrapped between super bag just can be determined by follow-up metric learning.In the practical stage, for the bag of known class, surpass bag according to its closest classification and judge its concept classification;And for the bag of newly-increased classification, owing to there is not the super bag of the classification of its correspondence, should be the super bag of unit apart from its nearest super Bao Ze, so can determine that it is newly-increased classification according to this situation.

Description

A kind of newly-increased category detection method based on multi-instance learning
Technical field
The present invention relates to machine learning, application technology, particularly to multi-instance learning, newly-increased classification monitoring technology, tolerance Study, is that one both can carry out automatic concept classification prediction/classification to existing classification, can detect newly-increased classification simultaneously Robust multi-instance learning algorithm.
Background technology
It is considered as most promising machine learning approach from sample learning.If using the ambiguousness of training sample as The criteria for classifying, then at present the research in this field is substantially set up under three kinds of learning frameworks, i.e. supervised learning, unsupervised learning and strong Chemistry is practised.
Supervised learning is by learning the training example with concept labelling, outside as correctly as possible to training set The concept labelling of example be predicted.The most all of training sample is all markd, and therefore its ambiguousness is minimum.Non-prison Educational inspector practises by learning the training example not having concept labelling, to find the structure hidden in data.The most all of instruction Practicing sample is all not have markd, and therefore its ambiguousness is the highest.Intensified learning by there is no concept labelling but with a delay The training example that award or effectiveness (can be considered the concept labelling of delay) are associated learns, to obtain certain from state to action Mapping.The most all of training sample is all markd, but unlike supervised learning, labelling is to postpone, therefore The ambiguousness of intensified learning is between supervised learning and unsupervised learning.
The nineties in 20th century middle and late stage, researchers are in the research to pharmaceutically active forecasting problem, it is proposed that many examples The concept of study.In this type of learns, " bag " that training set is had concept labelling by several forms, and comprises some in each bag There is no the example of concept labelling.If at least an example is under the jurisdiction of certain concept classification in a bag, then this is coated and is labeled as this Classification;If a bag is not belonging to certain concept classification, then any one example in this bag is not the most subordinate to the category.By to training The study of bag, it is desirable to the concept labelling of the bag outside training set is predicted by learning system as correctly as possible.
Compared with supervised learning, the training example in multi-instance learning does not has concept labelling, during this is with supervised learning All training examples have concept labelling different;Compared with unsupervised learning, in multi-instance learning, training package is to have concept labelling , these are the most different from not having any concept labelling in the training sample of unsupervised learning;And compared with intensified learning, many examples Habit does not has again the concept that timeliness postpones.The more important thing is, in conventional various learning frameworks, a sample is exactly one and shows Example, i.e. sample and example are one-to-one relationships;And in multi-instance learning, a sample (i.e. bag) contains multiple example, I.e. sample and example is the corresponding relation of one-to-many.Therefore, the ambiguousness of training sample and supervised learning in multi-instance learning, non- Supervised learning, intensified learning ambiguousness the most different, this allows for conventional learning method and is difficult to solve well problems. Owing to multi-instance learning has the character of uniqueness and is widely applied prospect, belong to a blind area of conventional machine learning research, Therefore it is considered as a kind of new learning framework.
The application scenarios of existing multi-instance learning algorithm is all classification kind and fixed number of static environment, rather than concept The Open Dynamic environment that classification is variable.As, when building image classification system based on multi-instance learning, at the number of training stage " elephant ", " fox " and " bird " three kinds of image concept classifications are only comprised according to concentrating.The system practical stage occurs newly the most most probably Image category, such as Tiger.Now, existing multi-instance learning algorithm can only simply by belong to newly-increased classification sample (as The picture of tiger) it is divided into a certain class (such as " fox ") of known class mistakenly, system thus can be made at Open Dynamic Environment lost efficacy.Therefore, multi-instance learning needs a kind of Robust learning algorithm that can detect newly-increased classification.
Summary of the invention
Goal of the invention: current multi-instance learning algorithm all existing classification sample can only be carried out concept classification prediction/point Class, under the scene having newly-increased classification to occur, simple for newly-increased classification sample and mistake can only be divided into known class by existing algorithm One in not.For the problems referred to above, present invention firstly provides and solve the newly-increased classification detection under multi-instance learning scene Task, turns to its form the framework of a metric learning, and proposes many examples new class detection learning algorithm of correspondence.Concrete next Say, the crucial example extraction in many examples " being wrapped " first with crucial example detection algorithm more ripe in multi-instance learning Out.These are so-called " crucial examples " refers in " bag " those examples that may decide that the corresponding concept labelling wrapped.Afterwards, For each known class, the crucial example of its correspondence is combined into one " the super bag of classification ", is not identified as key simultaneously and shows All examples of example form one " the super bag of unit ".Subsequently, wrapping the distance between super bag just can be by follow-up metric learning Determine.Wherein, classification surpasses wraps the classification for concept classification, and the super Bao Ze of unit is for increasing the detection of classification newly.On training rank Section, for the sample (bag) of known class, its some crucial example is wrapped the classification of its correspondence is super, additionally some Example is in the super bag of unit.But in order to obtain more preferable discriminant classification ability, it is known that the bag of class surpasses the distance of bag with corresponding classification should For minimum, the distance surpassing bag with unit is taken second place, and surpass the distance of bag with other classification should be bigger.In the system practical stage, for Know the bag of classification, bag can be surpassed according to its closest classification and judge its concept classification;And for the bag of newly-increased classification, by In the super bag of the classification that there is not its correspondence, should be the super bag of unit apart from its nearest super Bao Ze, so can come according to this situation Determine that it is newly-increased classification.
Technical scheme: a kind of newly-increased category detection method based on multi-instance learning, including multi-instance learning disaggregated model Training step and disaggregated model prediction steps;
Described many example classification model training step particularly as follows:
Step 1.1, on existing many sample datas, utilizes existing crucial example detection algorithm from each many examples bag XiThe crucial example that middle extraction is corresponding;
Step 1.2, the crucial example that the bag being under the jurisdiction of identical concept classification is extracted composition " the super bag of classification " Sc(c =1 ..., C).It addition, be not detected as all examples composition " the super bag of the unit " S of crucial example0
Step 1.3, definition bag to the distance of super bag is: the weighted sum of each example in super bag to bag beeline, its In, the beeline of example to bag is example to the minimum euclidean distance of example in bag, and in super bag, the weight of each example is by spending Amount study determines according to training data training.Described super bag both can be the super bag of classification, it is also possible to be the super bag of unit.
Step 1.4, according to the distance of bag to super bag, utilization measure learns described weight.In order to ensure this system There are enough discriminant classification abilities and new class power of test, in metric learning, need to meet following condition: (1) bag is to its corresponding class The distance Chao do not wrapped is minimum;(2) bag is second little to the super distance wrapped of unit;(3) bag surpasses the distance of bag more than front to other classification Both.On this basis, the training of model is carried out.
Many example classification model prediction step particularly as follows:
Step 2.1, the tolerance obtained in utilization measure learning process calculates the many examples bag in test set respectively to classification Super bag and unit surpass the distance of bag;
Step 2.2, according to the concept classification of calculated range estimation test set many examples bag.
Described from each many examples bag XiThe crucial example that middle extraction is corresponding, particularly as follows: according to multi-instance learning it is assumed that If bag XiIt is under the jurisdiction of in concept classification c, then XiIn at least an example be subordinate to c;If bag XiIt is not affiliated with in concept classification c, then XiIn any one example be all not affiliated with c.After utilizing existing crucial example extraction algorithm, wrap XiIn example be i.e. divided into Crucial example (indicates bag XiConcept classification ownership) and non-key example.
The described crucial example super bag of composition classification that the bag being under the jurisdiction of identical concept classification is extracted, particularly as follows: After the bag belonging to concept classification c is extracted its crucial example, by these crucial example one set of composition, it is denoted asWhereinFor i-th key example, VcFor being under the jurisdiction of the number of the crucial example of classification c, ScIt is general Read the super bag of classification corresponding to classification c.Similarly, the super package definition of all non-key examples composition is the super bag of unit, is denoted asWhereinFor the example of the super bag of composition unit, it is the non-key example of i-th in the super bag of unit.
Described bag is specially to the distance of super bag Wherein VkFor super bag SkIn example numbers, C represents the number of classification,ForAt bag XiIn arest neighbors,Table Show super bag SkIn the v example, MkFor the parameter that obtained by metric learning (i.e. from XiTo SkTolerance).
Described metric learning learns weight, is by the object function of distance one belt restraining of writing of bag to super bag, logical The solution crossing tradition alternative optimization solves and obtains desired parameters.
Described in model prediction step, the classifier calculated bag obtained during utilizing training, to the distance of super bag, has Body is: tolerance M that will arrive at model training step learningkBring into I.e. can obtain the bag distance to each super bag.
The described concept classification according to calculated range estimation test set many examples bag, if particularly as follows: bag is to certain class Chao not wrap ScClosest, then this bag is under the jurisdiction of concept classification c;If bag wraps S to unit is super0Closest, then this bag is under the jurisdiction of Newly-increased concept classification.
Beneficial effect: compared with prior art, the super bag of utilization structure provided by the present invention and metric learning judge Know that classification many examples bag detects newly-increased class method for distinguishing simultaneously, implementation process can make full use of flag data training many Learn-by-example grader, it is adaptable to have the scene that newly-increased classification occurs, can classify by sample datas many to known class, the most permissible The newly-increased classification of detection.It addition, under the scene occurred without newly-increased classification, the method for the invention still can obtain excellent performance.
Accompanying drawing explanation
Fig. 1 is many example classification model training workflow diagram of the embodiment of the present invention;
Fig. 2 is many example classification model prediction workflow diagram of the embodiment of the present invention.
Detailed description of the invention
Below in conjunction with specific embodiment, it is further elucidated with the present invention, it should be understood that these embodiments are merely to illustrate the present invention Rather than restriction the scope of the present invention, after having read the present invention, the those skilled in the art's various equivalences to the present invention The amendment of form all falls within the application claims limited range.
As shown in Figure 1-2, newly-increased category detection method based on multi-instance learning, instruct including multi-instance learning disaggregated model Practice step and disaggregated model prediction steps;
As it is shown in figure 1, described many example classification model training step particularly as follows:
Step 1.1, on existing many sample datas, utilizes existing crucial example detection algorithm from each many examples bag XiThe crucial example that middle extraction is corresponding;" crucial example " refers in " bag " that those may decide that showing of the corresponding concept labelling wrapped Example.
From each many examples bag XiThe crucial example that middle extraction is corresponding, if particularly as follows: according to multi-instance learning it is assumed that bag XiIt is under the jurisdiction of in concept classification c, then XiIn at least an example be subordinate to c;If bag XiIt is not affiliated with in concept classification c, then XiIn Any one example is all not affiliated with c.After utilizing existing crucial example extraction algorithm, wrap XiIn example be i.e. divided into key Example (indicates bag XiConcept classification ownership) and non-key example.
Step 1.2, the crucial example that the bag being under the jurisdiction of identical concept classification is extracted composition " the super bag of classification " Sc(c =1 ..., C).It addition, be not detected as all examples composition " the super bag of the unit " S of crucial example0
The crucial example super bag of composition classification that the bag being under the jurisdiction of identical concept classification is extracted, particularly as follows: to same Belong to after the bag of concept classification c extracts its crucial example, by these crucial examples one set of composition, be denoted asWhereinFor i-th key example, VcFor being under the jurisdiction of the number of the crucial example of classification c, ScIt is general Read the super bag of classification corresponding to classification c.Similarly, the super package definition of all non-key examples composition is the super bag of unit, is denoted as
Step 1.3, definition bag to the distance of super bag is: the weighted sum of each example in super bag to bag beeline, its In, the beeline of example to bag is example to the minimum euclidean distance of example in bag, and in super bag, the weight of each example is by spending Amount study determines according to training data training.
Described bag is specially to the distance of super bag Wherein VkFor super bag SkIn example numbers,ForAt bag XiIn arest neighbors, MkFor being obtained by metric learning Parameter (i.e. from XiTo SkTolerance), C represents the number of classification,Represent super bag SkIn the v example.
Metric learning learns weight, is by the object function of distance one belt restraining of writing of bag to super bag, by passing The solution of system alternative optimization solves and obtains desired parameters.
Step 1.4, according to the distance of bag to super bag, utilization measure learns described weight.In order to ensure this system There are enough discriminant classification abilities and new class power of test, in metric learning, need to meet following condition: (1) bag is to its corresponding class The distance Chao do not wrapped is minimum;(2) bag is second little to the super distance wrapped of unit;(3) bag surpasses the distance of bag more than front to other classification Both.On this basis, the training of model is carried out.
As in figure 2 it is shown, many example classification model prediction step particularly as follows:
Step 2.1, the super bag of many examples bag that the tolerance obtained during utilizing training calculates in test set respectively to classification With the distance that unit surpasses bag;Tolerance M that will arrive at model training step learningkBring into I.e. can obtain the bag distance to each super bag.
Step 2.2, according to the concept classification of calculated range estimation test set many examples bag: if bag surpasses to certain classification Bag ScClosest, then this bag is under the jurisdiction of concept classification c;If bag wraps S to unit is super0Closest, then this bag is under the jurisdiction of newly-increased Concept classification.

Claims (7)

1. a newly-increased category detection method based on multi-instance learning, it is characterised in that: include multi-instance learning disaggregated model Training step and disaggregated model prediction steps;
Described many example classification model training step particularly as follows:
Step 1.1, on existing many sample datas, utilizes existing crucial example detection algorithm from each many examples bag XiIn The crucial example that extraction is corresponding;
Step 1.2, the crucial example that the bag being under the jurisdiction of identical concept classification is extracted composition " the super bag of classification " Sc(c= 1,…,C);It addition, be not detected as all examples composition " the super bag of the unit " S of crucial example0
Step 1.3, definition bag to the distance of super bag is: each example in super bag, to the weighted sum of bag beeline, wherein, is shown Example is example to the minimum euclidean distance of example in bag to the beeline of bag, and in super bag, the weight of each example is by metric learning Determine according to training data training;
Step 1.4, according to the distance of bag to super bag, utilization measure learns described weight;In order to ensure that this system has foot Enough discriminant classification abilities and new class power of test, need to meet following condition: (1) bag surpasses to its corresponding classification in metric learning The distance of bag is minimum;(2) bag is second to the distance of the super bag of unit;(3) bag surpasses the distance of bag more than the above two to other classification;? On the basis of this, carry out the training of model;
Many example classification model prediction step particularly as follows:
Step 2.1, the super bag of many examples bag that the tolerance obtained during utilizing training calculates in test set respectively to classification and unit The distance of super bag;
Step 2.2, according to the concept classification of calculated range estimation test set many examples bag.
2. newly-increased category detection method based on multi-instance learning as claimed in claim 1, it is characterised in that: described from each Many examples bag XiThe crucial example that middle extraction is corresponding, if particularly as follows: according to multi-instance learning it is assumed that bag XiIt is under the jurisdiction of concept class In other c, then XiIn at least an example be subordinate to c;If bag XiIt is not affiliated with in concept classification c, then XiIn any one example all It is not affiliated with c;After utilizing existing crucial example extraction algorithm, wrap XiIn example be i.e. divided into crucial example and non-key show Example.
3. newly-increased category detection method based on multi-instance learning as claimed in claim 1, it is characterised in that: described will be subordinate to In the crucial example super bag of composition classification that the bag of identical concept classification is extracted, particularly as follows: to belonging to concept classification c's After its crucial example of bag extraction, by these crucial example one set of composition, it is denoted asWhereinFor i-th Crucial example, VcFor being under the jurisdiction of the number of the crucial example of classification c, ScIt is the super bag of classification corresponding for concept classification c;Similarly, The super package definition of all non-key examples composition is the super bag of unit, is denoted as
4. newly-increased category detection method based on multi-instance learning as claimed in claim 1, it is characterised in that: described bag is to super The distance of bag is specially Wherein VkFor super bag SKIn Example numbers,ForAt bag XiIn arest neighbors, MkFor the parameter obtained by metric learning.
5. newly-increased category detection method based on multi-instance learning as claimed in claim 1, it is characterised in that: described tolerance Practise and learn weight, be by the object function of distance one belt restraining of writing of bag to super bag, by the solution of tradition alternative optimization Method solves and obtains desired parameters.
6. newly-increased category detection method based on multi-instance learning as claimed in claim 1, it is characterised in that: described at model In prediction steps, the classifier calculated bag obtained during utilizing training is to the distance of super bag, particularly as follows: will walk at model training Tolerance M that rapid learning arriveskBring into The most available Bag is to the distance of each super bag.
7. newly-increased category detection method based on multi-instance learning as claimed in claim 1, it is characterised in that: described according to meter The concept classification of the range estimation test set many examples bag obtained, if particularly as follows: bag wraps S to certain classification is supercClosest, Then this bag is under the jurisdiction of concept classification c;If bag wraps S to unit is super0Closest, then this bag is under the jurisdiction of newly-increased concept classification.
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