CN109408228B - Intelligent perception method for allocating tasks based on allocation of budget - Google Patents
Intelligent perception method for allocating tasks based on allocation of budget Download PDFInfo
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Abstract
A kind of intelligent perception method for allocating tasks based on allocation of budget collects perception task set Γ={ τ that task requester is submitted1,...,τi,...,τn, n is a limited natural number, task τi=(Bi,Qi), BiIt is to complete task τiMaster budget, be a limited positive real number, QiIt is task τiQuality requirement value, be a limited positive integer；Collect user's set U={ u1,...,uj,...,umAnd the user set in user ujCredit rating qj, j ∈ { 1 ..., m }；Calculate user ujComplete task τiCost cij, and determine user ujComplete task τiIncome wij；According to task τiQuality requirement QiWith user ujCredit rating qjTask in perception task set Γ is allocated, according to task allocation result, calculates and pays user's remuneration rj。
Description
Technical field
The invention belongs to a numerical data processing technology fields, and in particular to a kind of intelligent perception based on allocation of budget
Method for allocating tasks.
Background technique
In recent years, intelligent movable equipment (such as smart phone, tablet computer, smartwatch) is along with mobile computing and nothing
The rapid development of line communication technology is widely used, and storage, calculating, communication capacity are constantly reinforced, and be equipped with crowd
Multisensor (such as camera, microphone, gravimeter, GPS, gyroscope, temperature sensor, blood pressure sensor).In this base
On plinth, the mobile device that people are used using a large amount of ordinary users passes through Internet of Things/mobile Internet as basic sension unit
It cooperates, realizes perception task distribution and perception data Collection utilization, be finally completed extensive, complicated city and social feeling
Know task.In order to utilize perception, calculating and the storage resource of these intelligent movable equipment, intelligent perception meter sufficiently, at low cost
Calculation mode comes into being and is widely studied and applies.It is different from the perceptive mode based on Sensor Network and Internet of Things, gunz sense
Know emphasized with a large amount of ordinary users perceptually source using public widely distributed property, flexible mobility and chance connectivity into
Row perception, and provide intelligence auxiliary for city and social management and support.It can be applicable to many key areas, as intelligent transportation,
The numerous areas such as public safety, socialization recommendation, environmental monitoring, city public administration, thus obtained countries in the world government, produced
The highest attention of industry and academia.
One intelligent perception application system generally comprises 3 component parts: cloud platform (i.e. system), task requester and appoints
It has been engaged in winner.Task requester issues perception task (hereinafter referred task) demand to cloud platform, and receives task from cloud platform
As a result；Cloud platform is mainly responsible for task publication, task distribution, perception data collection and Task Quality assessment；The complete winner of task, i.e.,
The common mobile subscriber (hereinafter referred user) for carrying intelligent movable equipment receives distributed task from cloud platform and is responsible for number
It according to perception and collects, and perception data is sent to cloud platform.In intelligent perception system, task distribution is to implement intelligent perception
Basis.Cloud platform needs the mission requirements submitted according to task requester, and combines the state of current online user, will be each
Task distribution (assigning) is to the numerous users for participating in intelligent perception, and the foundation of appointment is to realize specific optimization aim, such as most
Bigization task acceptance rate, maximization integral benefit etc..
From existing research achievement, current method for allocating tasks and system towards intelligent perception not yet consider with
Under several aspects: 1. platforms distribute to improve task receptance and system benefit the rational management of task budget；It is closed 2. choosing
The user of suitable credit rating and the quality requirement for meeting task by the cooperation of user, to save task budget.Existing
In method for allocating tasks, all tasks currently needed to be implemented are generally collected by platform, and send and need to be implemented to all users
Set of tasks, then according to the concrete condition of each user itself distribute task, generally assume that the budget of a task is only used
In the distribution of this task.In fact, the credit rating of user is limited, multiple users cooperate completion task then and can obtain more high-quality
The perception data of amount, therefore, the user of multiple and different credit ratings can complete appointing for a high quality demand by cooperating
Business.In addition, the resonable degree of task budget allocation can be improved in platform, for example platform can make full use of the surplus of task pre-
It calculates, assigns them to the insufficient task of partial budget, be expected to greatly improve task apportionment ratio while saving task budget.But
It is that current online method for allocating tasks not yet considers these factors, greatly limit intelligent perception applies model
It encloses.
Therefore, to adapt to extensive intelligent perception application scenarios, while the task apportionment ratio of platform is improved, is considering task
Quality requirement and user credit rating between relationship and platform in the case where the rational allocation of task budget, design
A kind of intelligent perception method for allocating tasks based on allocation of budget is very necessary.
Summary of the invention
Technical problem to be solved by the present invention lies in existing intelligent perception method for allocating tasks is overcome, one is provided
Kind design is rationally, task apportionment ratio is high, saves the intelligent perception method for allocating tasks based on allocation of budget of task budget.
Solving technical solution used by above-mentioned technical problem is a kind of intelligent perception task distribution based on allocation of budget
Method, which is characterized in that comprise the steps of:
(1) perception task set Γ={ τ that task requester is submitted is collected1,...,τi,...,τn, i ∈ 1 ...,
N }, n is a limited natural number, task τi=(Bi,Qi), BiIt is to complete task τiMaster budget, be a limited positive reality
Number, QiIt is task τiQuality requirement value, be a limited positive integer；
(2) user's set U={ u is collected1,...,uj,...,umAnd the user set in user ujCredit rating qj, j
∈ { 1 ..., m }, m are a limited natural number；
(3) user u is calculatedjComplete task τiCost cij, and determine user ujComplete task τiIncome wij；
(4) according to task τiQuality requirement QiWith budget BiAnd user ujCredit rating qjTo perception task set Γ
In task be allocated, it is specific that distribute formula as follows:
In formula, yiIndicate task τiWhether at the distribution of work, yi=1 indicates task τiAt the distribution of work, τi∈ Γ, yi=0 indicates
Task τiDistribution failure；xijIt indicates whether task τiDistribute to user uj, uj∈ U, xij=1 indicates task τiDistribute to use
Family uj, xij=0 indicates not by task τiDistribute to user uj, δ expression participation task τiThe sum of the remuneration of all users and task
The difference of master budget,
Unspent budget after indicating the previous task distribution of platform, is a positive real number, η ∈
(0,1) utilization rate of unspent budget is indicated；
(5) it according to task allocation result, calculates and pays user's remuneration rj；
As a kind of perferred technical scheme, the step (3) user ujComplete task τiCost cij,
cij=f (Qi,qj) (2)
In formula, qjFor user ujCredit rating, function f (Qi,qj) it is one non-negative with qjMonotonically increasing function；It is described
User ujComplete task τiIncome wij,
wij=g (Qi,qj) (3)
Function g (Qi,qj) it is one non-negative with qjMonotonically increasing function；
As a kind of perferred technical scheme, the formula (1) in the step (4) is an integer programming problem, is
It is efficient to solve the problems, such as that this is allocated by the following method:
S1: order set Γ ' is set of tasks to be allocated, Γ '=Γ when initial, for any task τi, τi∈ Γ ' is enabled
Q′iIndicate task τiRemaining quality requirement value, B 'iIndicate task τiResidual,
After indicating the previous task distribution of platform
Unspent budget, Q ' when initiali=Qi, B 'i=Bi,
Enable set
For remaining user set, set U' is optional
User's set, when initialSet
Expression can execute task τiUser set, initially
S2: judgement setIt is whether true, if so, according to the following formula
Find out a particular task τi*, particular task τi*It is initial special for the task that the quality requirement in unit budget is minimum
Determine task τi*Quality requirement value Q 'i*=Qi*, particular task τi*Residual B 'i*=Bi*, particular task τi*It is available
User's set
Otherwise, stop；
S3: one is found out according to the following formula closest to particular task τi*The user u of quality requirementj*,
In formula, ci*jIndicate user ujExecute distributed particular task τi*When the cost paid, wi*jIndicate user ujIt holds
The distributed particular task τ of rowi*When brought net earnings if can find turn to step S4；Otherwise, in set of tasks Γ
Middle this task of deletion, and enable yi*=0, i.e. particular task τi*Distribution failure, turns again to step S2；
S4: judge user uj*Execute particular task τi*Remuneration and particular task τi*Difference, that is, following formula of budget whether at
It is vertical,
(ci*j*+wi*j*)-B′i*≤δ (6)
C in formulai*j*Indicate user uj*Execute distributed particular task τi*When the total cost paid, wi*j*Indicate user uj*
Execute distributed particular task τi*When bring net earnings, if set up if turn to step S5；Otherwise, gather in available user
The middle deletion user u of U 'j*, turn again to step S3 and find new user；
S5: judge whether platform can utilize unspent budget
To help particular task τi*Complete distribution, i.e., following formula whether at
It is vertical,
If so, then user uj*Addition meets task τi*The user of quality requirement gathers
In, turn to step S6；It is no
It then, should be user uj*It is deleted from available user's set U', turns again to step S3 and find new user；
S6: by user uj*It is deleted from available user's set U', according to formula Q 'i*=Qi*′-qj*With formula B 'i*
=B 'i*-(ci*j*+wi*j*) update Q 'i*With B 'i*Value, then judge task τi*Quality requirement whether it is satisfied, i.e. formula Q 'i*≤
Whether 0 is true, if so, turn to step S7；If not, it turns to step S3 and continually looks for user；
S7: user's set
As execute task τi*A feasible user set, enable yi*=1, i.e. particular task
τi*At the distribution of work, x is enabledi*j*=1, i.e., by task τiDistribute to user uj*,Calculate unspent budgetEnable Γ '=Γ '-{ τi*,
The lower task of step S2 is turned again to be allocated.
As a kind of perferred technical scheme, for executing particular task τ in the step (5)i*User uj*It obtains
Remuneration rj*,
As user uj*Complete particular task τi*And after obtaining remuneration, by all xi*j*Value be set as 0,τi*∈
Γ, and by user uj*It is added in user's set U.
As a kind of perferred technical scheme, new when be collected into that task requester submitted in the step (1)
When perception task, new task is increased in set Γ；When an allocated task is completed, then by it from set Γ
It removes.
As a kind of perferred technical scheme, in the step (2) when detecting that user leaves system, by the user
It is deleted from set U；When being collected into new user, which is increased in set U.
Beneficial effects of the present invention are as follows:
1, the present invention considers the relationship between the quality requirement of task and user quality grade, since multiple users cooperate
Completion task can obtain higher-quality perception data, therefore under the constraint condition of task budget, according to the quality of task
Requirements complete perception task to choose the user collaboration of different quality grade, are expected to while meeting perception data quality big
Width saves task budget.
2, the present invention considers the influence that the budget of task distributes task, and proposing one kind can be improved task apportionment ratio
Method, the budget of task will be split as two parts by platform, and a part of budget is used to guarantee the normal allocation of this task, remaining
Partial budget the task that reasonable distribution can not be distributed to those because of budgetary shortfall will be carried out by platform.Institute in assigning process
There is task all equality of budgetary shortfall to obtain platform budget supplement, embodies the thought of fair allocat.This method for allocating tasks
Both promoted the budget of task more fully to be applied, and also more tasks can have been made by the distribution of work.
Detailed description of the invention
Fig. 1 is a kind of flow chart of the intelligent perception method for allocating tasks based on allocation of budget of the present invention.
Specific embodiment
The present invention is described in more detail with reference to the accompanying drawings and examples, but the present invention is not limited to following embodiment party
Formula.
In Fig. 1, the intelligent perception method for allocating tasks based on allocation of budget of the present embodiment is comprised the steps of:
(1) the perception task set that task requester is submitted is set as Γ={ τ1,τ2,τ3, task τi=(Bi,Qi), wherein i
∈ { 1,2,3,4 }, τ1=(4,75), τ2=(8,240), τ3=(5,110), τ4=(6,130)；
(2) user's set U={ u is collected1,u2,u3,u4,u5,u6, qjIt is user ujCredit rating, wherein j ∈ 1,2,
3,4 }, q1=3, q2=5, q3=3, q4=2, q5=3, q6=2；
(3) user u is calculatedjComplete task τiCost cij, and determine user ujComplete task τiIncome wij；
User ujComplete task τiCost cij,
cij=f (Qi,qj)=5Qi+10qj (1)
User ujComplete task τiIncome wij,
wij=g (Qi,qj)=Qi+2qj (2)
User u is calculated according to above formula (1) and (2)1,u2,u3,u4,u5,u6Execute task τ1,τ2,τ3,τ4Cost and receipts
Benefit is indicated with matrix respectively:
(4) according to task τiQuality requirement QiWith user ujCredit rating qjTo the task in perception task set Γ
It is allocated, specific distribution formula is as follows:
In formula, yiIndicate task τiWhether at the distribution of work, yi=1 indicates task τiAt the distribution of work, τi∈ Γ, yi=0 indicates
Task τiDistribution failure；xijIt indicates whether task τiDistribute to user uj, uj∈ U, xij=1 indicates task τiDistribute to use
Family uj, xij=0 indicates not by task τiDistribute to user uj, δ expression participation task τiThe sum of the remuneration of all users and task
The difference of master budget,
Unspent budget after indicating platform previous task distribution, is a positive real number, η ∈ (0,
1) utilization rate of unspent budget is indicated；
Above-mentioned formula (3) is an integer programming problem, in order to efficiently solve the problems, such as that this is allocated by the following method:
S1: order set Γ ' is set of tasks to be allocated, Γ '=Γ when initial, for any task τi,
τi∈ Γ ', enables Q 'iIndicate task τiRemaining quality requirement value, B 'iIndicate task τiResidual,
It indicates
Unspent budget after the previous task distribution of platform, Q ' when initiali=Qi, B 'i=Bi,Enable set
For remaining user
Set, set U ' is available user set, when initial
Set
Expression can execute task τiUser
Set, initially
S2: judgement set
It is whether true, if so, according to the following formula
Find out a particular task τi*, particular task τi*It is initial special for the task that the quality requirement in unit budget is minimum
Determine task τi*Quality requirement value Q 'i*=Qi*, particular task τi*Residual B 'i*=Bi*, particular task τi*It is available
User's set
Otherwise, stop；
SetThe minimum task τ of quality requirement in unit budget is found out according to formula (4)i*, acquire
τi*=τ2, initial particular task τ2Quality requirement value Q2'=Q2=8, particular task τ2Residual B2'=B2=240, it is special
Determine task τ2Available user's set
S3: one is found out according to the following formula closest to particular task τi*The user u of quality requirementj*,
In formula, ci*jIndicate user ujExecute distributed particular task τi*When the cost paid, wi*jIndicate user ujIt holds
The distributed particular task τ of rowi*When brought net earnings if can find turn to step S4；Otherwise, in set of tasks Γ
Middle this task of deletion, and enable yi*=0, i.e. particular task τi*Distribution failure, turns again to step S2；
τ is obtained by step S2i*=τ2, u is found out according to formula (5)j*=u2, turn to step S4；
S4: judge user uj*Execute particular task τi*Remuneration and particular task τi*Difference, that is, following formula of budget whether at
It is vertical,
(ci*j*+wi*j*)-B′i*≤δ (6)
C in formulai*j*Indicate user uj*Execute distributed particular task τi*When the total cost paid, wi*j*Indicate user uj*
Execute distributed particular task τi*When bring net earnings, if set up if turn to step S5；Otherwise, gather in available user
User u is deleted in U'j*, turn again to step S3 and find new user；
User u2Execute distributed particular task τ2When the total cost c that pays22, user u2Execute distributed particular task
τ2When bring net earnings w22, due to c22=90, w22=18, B '2=240, δ=25, then (c22+w22)-B′2≤ δ is set up, and is turned
To step S5；
S5: judge whether platform can utilize unspent budgetTo help particular task τi*Complete distribution, i.e., following formula whether at
It is vertical,
If so, then user uj*Addition meets task τi*The user of quality requirement gathers
In, turn to step S6；It is no
It then, should be user uj*It is deleted from available user's set U', turns again to step S3 and find new user；
For user u2, η=0.8 is enabled, due to
c22+w22=90+18=108, then
Formula (7) is set up, by user u2Set is added
In, turn to step S6；
S6: by user uj*It is deleted from available user's set U', according to formula Q 'i*=Qi*′-qj*With formula B 'i*
=B 'i*-(ci*j*+wi*j*) update Q 'i*With B 'i*Value, then judge task τi*Quality requirement whether it is satisfied, i.e. formula Q 'i*≤
Whether 0 is true, if so, turn to step S7；If not, it turns to step S3 and continually looks for user；
User u is deleted in user's set U'2, update Qi' and Bi' value, Q2'=Q2'-q2=3, B2'=B2'-(c22+
w22)=240- (90+18)=132, due to Q2'=3, then formula Q2'≤0 is invalid, turns to step S3；
In step s3,
Turn to step S4；
In step s 4, for user u1, due to (c21+w21)-B2'=(70+14) -132=-48, δ=25, then formula
(6) it sets up, turns to step S5；
In step s 5, for user u1, whether judgment formula (7) is true, due to
c21+w21=70+14=84, then formula (7) is set up, by user u1Set is added
In, turn to step S6；
In step s 6, user u is deleted in user's set U'1, update Qi' and Bi' value, Q2'=Q2'-q1=0, B2'
=B2'-(c21+w21)=132- (70+14)=48, due to Q2'=0, then formula Q2'≤0 is set up, and step S7 is turned to；
S7: user's set
As execute task τi*A feasible user set, enable yi*=1, i.e. particular task
τi*At the distribution of work, x is enabledi*j*=1, i.e., by task τiDistribute to user uj*,
Calculate unspent budget
Enable Γ '=Γ '-{ τi*,
The lower task of step S2 is turned again to be allocated；
User's set U2 +As execute task τ2A feasible user set, enable y2=1, to any user
All enable x2j=1, calculate unspent budget
Enable Γ '=Γ '-{ τ2,
Turning to step S402 is that next task is allocated；
It is pointed out that task τ2It is that the user's set U for meeting quality requirement is had found under conditions of budget abundance2 +
Smoothly complete distribution；
In step s 2, gather
According to formula (4) find out one in unit budget quality requirement it is minimum
Task τi*, acquire τi*=τ3, initial particular task τ3Quality requirement value Q3'=Q3=5, particular task τ3Residual B3'
=B3=110, particular task τ3Available user's set
In step s3, u is found out according to formula (5)j*=u3, turn to step S4；
In step s 4, user u3Execute distributed particular task τ3When the total cost c that pays33, user u3Execution divides
With particular task τ3When bring net earnings w33, due to c33=55, w33=11, B '3=110, δ=25, then (c33+w33)-B′3
≤ δ is set up, and turns to step S5；
In step s 5, for user u3, due to
c33+w33=55+
11=66, then formula (7) is set up, by user u3Set is addedIn, turn to step S6；
In step s 6, user u is deleted in user's set U'3, then update Qi' and Bi' value, Q3'=Q3'-q3=5-3
=2, B3'=B3'-(c33+w33)=110-66=44, due to Q3'=2, then formula Q3'≤0 is invalid, turns to step S3；
In step s3, uj*=u4, turn to step S4；
In step s 4, for user u4, due to c34=45, w34=9, B '3=44, δ=25, then (c34+w34)-B′3≤δ
It sets up, turns to step S5；
In step s 5, for user u4, whether judgment formula (7) is true, due toc34+w34=45+9=54, then formula (7) is set up, by user u4Set is added
In, turn to step S6；
In step s 6, user u is deleted in user's set U'4, then update Qi' and Bi' value, Q3'=Q3'-q4=2-2
=0, B3'=B3'-(c34+w34)=44-54=-10, due to Q3'=0, then formula Q3'≤0 is set up, and step S7 is turned to；
In the step s 7, user's set U3 +As execute task τ3A feasible user set, enable y3=1, to appoint
One user
All enable x3j=1, calculate unspent budget
Enable Γ '=Γ '-
{τ3,
Turning to step S2 is that next task is allocated；
Task τ3Although budgetary shortfall, since platform is used to make up task budget using the budget of previous task surplus,
Task τ3It is able to find the user's set U for meeting quality requirement3 +Smoothly complete distribution；
In step s 2, gather
According to formula (4) find out one in unit budget quality requirement it is minimum
Task τi*, acquire τi*=τ4, initial particular task τ4Quality requirement value Q4'=Q4=6, particular task τ4Residual B4'
=B4=130, particular task τ4Available user's set
In step s3, u is found out according to formula (5)j*=u5, turn to step S4；
In step s 4, user u5Execute distributed particular task τ5When the total cost c that pays45, user u5Execution divides
With particular task τ5When bring net earnings w45, c45=60, w45=12, B '4=130, δ=25, then (c45+w45)-B′4≤ δ at
It is vertical, turn to step S5；
In step s 5, for user u5, due toc45+w45=60+
12=72, then formula (7) is set up, by user u5Set is addedIn, turn to step S6；
In step s 6, user u is deleted in user's set U'5, then update Qi' and Bi' value, Q4'=Q4'-q5=6-3=
3, B4'=B4'-(c45+w45)=130-72=58, due to Q4'=3, then formula Q4'≤0 is invalid, turns to step S3；
In step s3, uj*=u6, turn to step S4；
In step s 4, for user u6, due to c46=50, w46=10, B '4=58, δ=25, then (c46+w46)-B′4≤
δ is set up, and turns to step S5；
In step s 5, for user u4, whether judgment formula (7) is true, due to
c46+w46=50+10=60, then formula (7) is set up, by user u6Collection is added
It closes
In, turn to step S6；
In step s 6, user u is deleted from user's set U'6, then update Qi' and Bi' value, Q4'=Q4'-q6=3-2
=1, B4'=B4'-(c46+w46)=68-60=8, due to Q4'=1, then formula Q4'≤0 is invalid, turns to step S3；
In step s3, task τ can be executed due to can not find new user4, therefore, task τ4It can not distribute, therefore enable
y4=0, and this task is deleted in set of tasks Γ, turn again to step S2；
Task τ4The user's set for meeting Task Quality demand due to can not find, is unable to complete distribution；
In step s 2, gather
Minimum times of quality requirement in unit budget is found out according to formula (4)
Be engaged in τi*, acquire τi*=τ1, initial particular task τ1Quality requirement value Q1'=Q1=4, particular task τ1Residual B1'=
B1=75, particular task τ1Available user's set
In step s3, u is found out according to formula (5)j*=u5, turn to step S4；
In step s 4, user u5Execute distributed particular task τ1When the total cost c that pays15, user u5Execution divides
With particular task τ5When bring net earnings w15, c15=50, w15=10, B '1=75, δ=25, then (c15+w15)-B′1≤ δ at
It is vertical, turn to step S5；
In step s 5, for user u5, η=0.8 is enabled, due to
c15+
w15=60, then formula (7) is set up, by user u5Set is added
In, turn to step S6；
In step s 6, user u is deleted from user's set U'5, then update Qi' and Bi' value, Q1'=Q1'-q5=4-3
=1, B1'=B1'-(c15+w15)=75-60=15, due to Q1'=1, then formula Q1'≤0 is invalid, turns to step S3；
In step s3, uj*=u6, turn to step S4；
In step s 4, for user u6, due to c16=40, w16=8, B '1=15, δ=25, then (c16+w16)-B′1≤δ
It is invalid, turn to step S3；
In step s3, task τ can be executed due to can not find new user1, therefore, task τ1It can not distribute, therefore enable
y1=0, and this task is deleted in set of tasks Γ, turn again to step S2；
Task τ1Budgetary shortfall, and be more than the range that platform can make up task budget, therefore be unable to complete distribution；
In step s 2, gather
Then task is all assigned in set Γ；
(5) (8) are to execute task τ according to the following formulai*(τi*∈ Γ) user
Mete out rewards rj*,
Execute task τ2User collection be combined into U2 +, calculate to obtain r1=70+14=84, r2=90+18=108, by remuneration r1With
r2User u is paid respectively1With user u2, execute task τ2User collection be combined into
Calculate to obtain r3=55+11=66, r4=45+
9=54, by remuneration r3And r4User u is paid respectively3With user u4, remaining task and user are unallocated, no remuneration；As user uj*
Completion task simultaneously obtains remuneration τi*Afterwards, by all xi*j*Value be set as 0, whereinτi*∈ Γ, and by user uj*Add
In access customer set U, payt can also carry out again after relative users complete perception task and upload perception data.
Claims (1)
1. a kind of intelligent perception method for allocating tasks based on allocation of budget, which is characterized in that comprise the steps of:
(1) perception task set Γ={ τ that task requester is submitted is collected1,...,τi,...,τn, i ∈ { 1 ..., n }, n is
One limited natural number, task τi=(Bi,Qi), BiIt is to complete task τiMaster budget, be a limited positive real number, QiIt is
Task τiQuality requirement value, be a limited positive integer；
(2) user's set U={ u is collected1,...,uj,...,umAnd the user set in user ujCredit rating qj, j ∈
{ 1 ..., m }, m are a limited natural number；
(3) user u is calculatedjComplete task τiCost cij, and determine user ujComplete task τiIncome wij；
(4) according to task τiQuality requirement QiWith budget BiAnd user ujCredit rating qjTo in perception task set Γ
Task is allocated, and specific distribution formula is as follows:
In formula, yiIndicate task τiWhether at the distribution of work, yi=1 indicates task τiAt the distribution of work, τi∈ Γ, yi=0 indicates task τi
Distribution failure；xijIt indicates whether task τiDistribute to user uj, uj∈ U, xij=1 indicates task τiDistribute to user uj, xij
=0 indicates not by task τiDistribute to user uj, δ expression participation task τiThe sum of the remuneration of all users and task master budget
Difference,
Unspent budget after indicating the previous task distribution of platform, is a positive real number, η ∈ (0,1) is indicated
The utilization rate of unspent budget；
Formula (1) is an integer programming problem, is allocated by the following method:
S1: order set Γ ' is set of tasks to be allocated, Γ '=Γ when initial, for any task τi, τi∈ Γ ', enables Q 'i
Indicate task τiRemaining quality requirement value, B 'iIndicate task τiResidual,
After indicating the previous task distribution of platform
Unspent budget, Q ' when initiali=Qi, B 'i=Bi,
Enable set
For remaining user set, set U' is optional
User set, when initial
Set
Expression can execute task τiUser set, initially
S2: judgement set
It is whether true, if so, according to the following formula
Find out a particular task τi*, particular task τi*It is specific initial for the task that the quality requirement in unit budget is minimum
Be engaged in τi*Quality requirement value Q 'i*=Qi*, particular task τi*Residual B 'i*=Bi*, particular task τi*Available user
Set
Otherwise, stop；
S3: one is found out according to the following formula closest to particular task τi*The user u of quality requirementj*,
In formula, ci*jIndicate user ujExecute distributed particular task τi*When the cost paid, wi*jIndicate user ujExecution divides
The particular task τ matchedi*When brought net earnings if can find turn to step S4；Otherwise, it is deleted in set of tasks Γ
This task, and enable yi*=0, i.e. particular task τi*Distribution failure, turns again to step S2；
S4: judge user uj*Execute particular task τi*Remuneration and particular task τi*Whether difference, that is, following formula of budget is true,
(ci*j*+wi*j*)-B′i*≤δ
C in formulai*j*Indicate user uj*Execute distributed particular task τi*When the total cost paid, wi*j*Indicate user uj*It executes
Distributed particular task τi*When bring net earnings, if set up if turn to step S5；Otherwise, in available user's set U'
Delete user uj*, turn again to step S3 and find new user；
S5: judge whether platform can utilize unspent budget
To help particular task τi*Complete distribution, i.e., whether following formula is true,
If so, then user uj*Addition meets task τi*The user of quality requirement gathers
In, turn to step S6；Otherwise,
It should be user uj*It is deleted from available user's set U', turns again to step S3 and find new user；
S6: by user uj*It is deleted from available user's set U', according to formula Q 'i*=Qi*'-qj*With formula B 'i*=B
′i*-(ci*j*+wi*j*) update Q 'i*With B 'i*Value, then judge task τi*Quality requirement whether it is satisfied, i.e. formula Q 'i*≤ 0 is
No establishment, if so, turn to step S7；If not, it turns to step S3 and continually looks for user；
S7: user's set
As execute task τi*A feasible user set, enable yi*=1, i.e. particular task τi*At
The distribution of work enables xi*j*=1, i.e., by task τiDistribute to user uj*,
Calculate unspent budget
It enables
Γ '=Γ '-{ τi*,
The lower task of step S2 is turned again to be allocated；
(5) it according to task allocation result, calculates and pays user's remuneration rj, for executing particular task τi*User uj*It obtains
Remuneration rj*:
As user uj*Complete particular task τi*And after obtaining remuneration, by all xi*j*Value be set as 0,
τi*∈ Γ,
And by user uj*It is added in user's set U.
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