Assessment Title: Implementation and evaluation of case study

Cardiff School of Computer Science and Informatics
Coursework Assessment Pro-forma
Module Code: CMT215
Module Title: Automated Reasoning
Lecturer: Hiroyuki Kido
Assessment Title: Implementation and evaluation of
case study
Date Set: 5th March 2021
Submission date and Time: 29th April at 9:30AM
Return Date: 27th May 2021
This coursework is worth 50% of the total marks available for this module.
If coursework is submitted late (and where there are no extenuating
circumstances):
1. If the assessment is submitted no later than 24 hours after the deadline,
the mark for the assessment will be capped at the minimum pass mark;
2. If the assessment is submitted more than 24 hours after the deadline,
a mark of 0 will be given for the assessment.
Your submission must include the official Coursework Submission Cover
sheet, which can be found here:
https://docs.cs.cf.ac.uk/downloads/coursework/Coversheet.pdf
Submission Instructions
Description Type Name
Cover sheet Compulsory One pdf file [Student number].pdf
Code for Part 1 Compulsory One Z3/Python file P1_[Student number].txt/py)
Code for Part 2 Compulsory One Z3/Python file P2_[Student number].txt/py)
Code for Part 3 Compulsory One Z3/Python file P3_[Student number].txt/py)
All of the files must be submitted via Learning Central. Any code submitted
will be run on a system equivalent to that available on the laptops
provided to the students on request and must be submitted as stipulated in
the instructions above. The code should run without any change.
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Any deviation from the submission instructions above (including the
number and types of files submitted) may result in a mark of zero for the
assessment or question part.
Staff reserve the right to invite students to a meeting to discuss coursework
submissions.
Assignment
The coursework asks you to solve constraint satisfaction problems using Z3
or Z3Py. It consists of three parts: (1) scheduling, (2) program correctness
and (3) novel problem.
Part 1: Scheduling [8 marks]
Provide Z3 or Z3Py code to solve the scheduling problem given as follows.
There are six jobs #1, #2, #3, #4, #5 and #6. All jobs are executed by
three persons A, B and C. Any solutions of the scheduling problem must
satisfy all of the following constraints.
(1) Each job should be executed by one of three persons A, B and C
without interruption.
(2) Each person can handle at most one job each time.
(3) Each job #i has running time 3 + i if person A or B executes it, and
4 + i otherwise.
(4) Job #3 should be executed by B after jobs #5 and #6 have been
completed.
(5) Each job should be done in time 0 to 15.
In the provided code, you may declare only three functions whose domains
and ranges are both the set of integers.
1. Function S maps each job to its start time.
2. Function E maps each job to its end time.
3. Function P maps each job to the person who executes it.
Explain a solution to the scheduling problem. The solution should be
obtained by running the code in the command-line interface with either of
the following commands.
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$ z3 -smt2 P1_[Student number].txt
$ python P1_[Student number].py
Here, P1_[Student number] is your file containing the code. The explanation
should include the output of the code and the information about who
executes which job, and when it starts and ends, for each job. The following
is an example explanation for job #1.
Job #1 is executed by person A from time 0 to time 4.
Insert the comment symbol (“;” in Z3 and “#” in Z3Py) at the beginning of
each line in which your explanation is provided. All the explanations should
be written at the very end of the file containing the code.
Part 2: Program Correctness [14 marks]
Provide Z3 or Z3Py code to establish the possibility that the following program
causes a crash.
1: a 1
2: b 1
3: for i 0; 15 do
4: if ? then
5: a a + i
6: b a + b
7: else
8: b b + 2i
9: a a + b
10: end if
11: if b = 1010 then
12: crash
13: end if
14: end for
Here, “ ” is an assignment operator and “?” is an unknown test that may
yield false or true in any situation.
Explain the constraints implemented in the code. The explanation should
be commented on right before the corresponding part of the code in the
source code file.
Demonstrate a crash by giving values of a and b, for all i specified in
the program. All of the values should be obtained by running the provided
code in the command-line interface with either of the following commands.
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$ z3 -smt2 P2_[Student number].txt
$ python P2_[Student number].py
Here, P2_[Student number] is your file containing the code. The crash
you demonstrate must be different from the crash the following example
demonstrates.
a = [1,2,3,5,20,24,73,134,141,359,368,378,1364,2374,2387,5812]
b = [1,1,4,9,15,39,49,61,202,218,586,964,986,1010,3397,3425]
The output of the code and all of the values should be written at the very
end of the file containing the code. Do not forget to insert the comment
symbol at the beginning of each line in which the explanation, output and
values are provided.
Part 3: Novel Problem [28 marks]
Give and explain a problem that is solvable using Z3 or Z3Py. The problem
should be of a different kind from Part 1 and Part 2, whereas it should be
of a similar size to them. The explanation should include a clear statement
of the problem. It should discuss what the problem is, why it is important,
and why it is hard. The explanation should also include a clear statement
of originality in the application of knowledge. It should discuss the main existing
approaches such as ideas, methods or techniques, and their strengths
and limitations. It should also discuss the key components of your approach
and its strengths and limitations. When you reference published literature,
follow the guidance on Referencing in Code available in Learning Materials
in COMSC-SCHOOL in Learning Central. The explanation should be
commented on at the very beginning of the source code file.
Provide Z3 or Z3Py code and a solution to the problem devised. Explain
the constraints implemented in the code and the output of the code from
the command-line interface. The explanation of the constraints should be
commented on right before the corresponding part of the code in the source
code file. The output and its explanation should be commented on at the
very end of the source code file.
Learning Outcomes Assessed
The coursework will allow the student to demonstrate their knowledge and
practical skills and to apply the principles taught in lectures in the context
of concrete applications. The coursework contributes to assess the following
learning outcomes:
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1. The ability to implement and evaluate automated reasoning approaches
to solve a given task
2. The ability to explain the basic principles underlying common automated
reasoning approaches
Criteria for Assessment
Credit will be awarded against the criteria shown in the marking below.
1. The code gives an output and the output is explained. (3 marks/part)
2. Functions/constants and constraints are correctly encoded. (5 marks/part)
3. Functions/constants and constraints are correctly extracted and explained.
(6 marks/part)
4. The statement of the problem is clear. The clarity is assessed against
the following aspects:
• What is the problem? (2 marks/part)
• Why is it important? (2 marks/part)
• Why is it hard? (2 marks/part)
5. The originality in the application of knowledge is explained. It is
assessed against the following aspects:
• What are the main existing approaches such as ideas, methods
or techniques to the problem? (2 marks/part)
• What are the strengths and limitations of the main existing approaches
to the problem? (2 marks/part)
• What are the key components of your approach to the problem?
(2 marks/part)
• What are the strengths and limitations of your approach to the
problem? (2 marks/part)
Criterion 1 Criterion 2 Criterion 3 Criterion 4 Criterion 5
Part 1 3 marks 5 marks N/A N/A N/A
Part 2 3 marks 5 marks 6 marks N/A N/A
Part 3 3 marks 5 marks 6 marks 6 marks 8 marks
18% 30% 24% 12% 16%
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The full marks for each item will only be awarded if the requested content
is fully presented. The examiner will have the discretion to award partial
marks for an item if it is partially present. The following indicates the level
of attainment against the appropriate award.
• Distinction (70-100%)
• Merit (60-69%)
• Pass (50-59%)
• Fail (0-50%)
Feedback
Feedback on your coursework will address the above criteria. Feedback and
marks will be returned by 27th May 2021 via Learning Central. Feedback
from this assignment will be useful for Dissertation CMT400 and the second
assessment in this module.
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