Group 13 - mercedestrenz

[spencergerlach]

Submitting Author: Spencer Gerlach (@spencergerlach)
All current maintainers: (@tieandrews, @kellywujy, @mozhao0331)
Package Name: mercedestrenz
One-Line Description of Package: Explores Mercedes-Benz used vehicle prices and predicts prices based on vehicle attributes.
Repository Link: https://github.com/UBC-MDS/mercedestrenz
Version submitted: v1.0.0
Editor: Ty Andrews, Spencer Gerlach, Kelly Wu, Morris Zhao
Reviewer 1: Eyre Hong
Reviewer 2: Dhruvi Nishar
Reviewer 3: Caroline Tang
Reviewer 4: Jonah Hamilton
Archive: TBD
Version accepted: TBD
Date accepted (month/day/year): TBD

---

Description

• Include a brief paragraph describing what your package does: Show various information about used Mercedes-Benz vehicles, and provide useful functions for comparison of different vehicles and prediction of vehicle price based on various attributes.

Scope

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  • Who is the target audience and what are scientific applications of this package?

    • The target audience for this package is people in the market for buying a used vehicle (Mercedes-Benz), that are looking to understand the current market, easily see a list of available cars that suit their needs, and to predict the price of a vehicle with certain desired traits. This can also be used in a similar fashion for people looking to sell their vehicle, as they may also want to know the current market, and predict how much they should sell their vehicle for.

  • Are there other Python packages that accomplish the same thing? If so, how does yours differ?

    • Our package is specific to Mercedes-Benz enthusiasts. It is completely unique in that sense, as the data used to train the prediction model and show market summaries is specifically used Mercedes-Benz vehicles.

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[eyrexh]

Package Review

Please check off boxes as applicable, and elaborate in comments below. Your review is not limited to these topics, as described in the reviewer guide

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For packages also submitting to JOSS

• The package has an obvious research application according to JOSS's definition in their submission requirements.

Note: Be sure to check this carefully, as JOSS's submission requirements and scope differ from pyOpenSci's in terms of what types of packages are accepted.

The package contains a paper.md matching JOSS's requirements with:

• A short summary describing the high-level functionality of the software
• Authors: A list of authors with their affiliations
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• References: With DOIs for all those that have one (e.g. papers, datasets, software).

Final approval (post-review)

• The author has responded to my review and made changes to my satisfaction. I recommend approving this package.

Estimated hours spent reviewing:
1 hr

Review Comments

1. The project is overall well designed with a function that stores all the datasets to save time. The functions themselves are well organized and easy to apply. Also, it is great to include the input value error controlling. Well done!
2. However, I do suggest the workflow should be mentioned in the README and Example Usage files for people to have a clear idea that listing_search () and plot_mercedes_price() require the load_sample_mercedes_listings() to run first.
3. The README file has a different usage section than the Example Usage file with some incorrect lines: from mercedestrenz.modelling import train_mercedes_price_prediction_model
   No mercedestrenz.modelling module can be found. The Example Usage file is correct with from mercedestrenz.train import train_mercedes_price_prediction_model. This might misguide people to using the package so highly recommend fixing it.
4. The Example Usage file only contains 3 functions and does not have the function predict_mercedes_price(). I highly recommend adding it inside.
5. The code coverage is 88% and the reason is the helper function export_mercedes_price_model in the train.py and test.py haven't been tested. I understand it will be hard to test the joblib model files. However, some other lines like

if type(version) is not str:
--
78 | raise TypeError("version must be a string of form 'vX'")

in predict_mercedes_price might be a good idea to cover in the test since it only checks the input is a string type.

Overall it is a well-done project just the formatting and workflow might need further improvement. Great jobs!

[xXJohamXx]

Package Review

Please check off boxes as applicable, and elaborate in comments below. Your review is not limited to these topics, as described in the reviewer guide

• As the reviewer I confirm that there are no conflicts of interest for me to review this work (If you are unsure whether you are in conflict, please speak to your editor before starting your review).

Documentation

The package includes all the following forms of documentation:

• A statement of need clearly stating problems the software is designed to solve and its target audience in README.
• Installation instructions: for the development version of the package and any non-standard dependencies in README.
• Vignette(s) demonstrating major functionality that runs successfully locally.
• Function Documentation: for all user-facing functions.
• Examples for all user-facing functions.
• Community guidelines including contribution guidelines in the README or CONTRIBUTING.
• Metadata including author(s), author e-mail(s), a url, and any other relevant metadata e.g., in a pyproject.toml file or elsewhere.

Readme file requirements
The package meets the readme requirements below:

• Package has a README.md file in the root directory.

The README should include, from top to bottom:

• The package name
• Badges for:
  • Continuous integration and test coverage,
  • Docs building (if you have a documentation website),
  • A repostatus.org badge,
  • Python versions supported,
  • Current package version (on PyPI / Conda).

NOTE: If the README has many more badges, you might want to consider using a table for badges: see this example. Such a table should be more wide than high. (Note that the a badge for pyOpenSci peer-review will be provided upon acceptance.)

• Short description of package goals.
• Package installation instructions
• Any additional setup required to use the package (authentication tokens, etc.)
• Descriptive links to all vignettes. If the package is small, there may only be a need for one vignette which could be placed in the README.md file.
  • Brief demonstration of package usage (as it makes sense - links to vignettes could also suffice here if package description is clear)
• Link to your documentation website.
• If applicable, how the package compares to other similar packages and/or how it relates to other packages in the scientific ecosystem.
• Citation information

Usability

Reviewers are encouraged to submit suggestions (or pull requests) that will improve the usability of the package as a whole.
Package structure should follow general community best-practices. In general please consider whether:

• Package documentation is clear and easy to find and use.
• The need for the package is clear
• All functions have documentation and associated examples for use
• The package is easy to install

Functionality

• Installation: Installation succeeds as documented.
• Functionality: Any functional claims of the software been confirmed.
• Performance: Any performance claims of the software been confirmed.
• Automated tests: Tests cover essential functions of the package and a reasonable range of inputs and conditions. All tests pass on the local machine.
• Continuous Integration: Has continuous integration setup (We suggest using Github actions but any CI platform is acceptable for review)
• Packaging guidelines: The package conforms to the pyOpenSci packaging guidelines.
  A few notable highlights to look at:
  • Package supports modern versions of Python and not End of life versions.
  • Code format is standard throughout package and follows PEP 8 guidelines (CI tests for linting pass)

For packages also submitting to JOSS

• The package has an obvious research application according to JOSS's definition in their submission requirements.

Note: Be sure to check this carefully, as JOSS's submission requirements and scope differ from pyOpenSci's in terms of what types of packages are accepted.

The package contains a paper.md matching JOSS's requirements with:

• A short summary describing the high-level functionality of the software
• Authors: A list of authors with their affiliations
• A statement of need clearly stating problems the software is designed to solve and its target audience.
• References: With DOIs for all those that have one (e.g. papers, datasets, software).

Final approval (post-review)

• The author has responded to my review and made changes to my satisfaction. I recommend approving this package.

Estimated hours spent reviewing: 1.5

---

Review Comments

Great work team! Your package works as expected and as you mentioned it is unique in its function!

• Under the functionality section "Code format is standard throughout package and follows PEP 8 guidelines (CI tests for linting pass)" is listed as a requirement to check for however from what I can see your ci-cd.yml file does not include a check for formatting. There are many pre-built github actions that can be use to check for code format so I recommend using one of those.

• In the usage section of the in the README and on the Read The Docs page there is an extra bracket on the end of the example for the plot_mercedes_price() function.

• I like that you have paired down how many features the prediction model uses to keep it simple for users, however I think it could be worthwhile to include some rationale/background in the README on why you chose the specific features to predict on.

• This is a very minor suggestion, for the predict_mercedes_price function I think adding some simple formatting to the output would increase the "user friendliness" of the function. Currently the only output is a number but you could add a dollar sign as we as a message like "For the you entered with the current predicted price is BLANK.

• In terms of future work for this package as the goal is to assist in buying/selling used Mercedes cars, including more data sources (not just craigslist) could help provide better accuracy/ a more representative overview of buying/selling. linked to this as time goes on, updating the data to the most current version would be beneficial to future users.

[dhruvinishar]

Package Review

Please check off boxes as applicable, and elaborate in comments below. Your review is not limited to these topics, as described in the reviewer guide

• As the reviewer I confirm that there are no conflicts of interest for me to review this work (If you are unsure whether you are in conflict, please speak to your editor before starting your review).

Documentation

The package includes all the following forms of documentation:

• A statement of need clearly stating problems the software is designed to solve and its target audience in README.
• Installation instructions: for the development version of the package and any non-standard dependencies in README.
• Vignette(s) demonstrating major functionality that runs successfully locally.
• Function Documentation: for all user-facing functions.
• Examples for all user-facing functions.
• Community guidelines including contribution guidelines in the README or CONTRIBUTING.
• Metadata including author(s), author e-mail(s), a url, and any other relevant metadata e.g., in a pyproject.toml file or elsewhere.

Readme file requirements
The package meets the readme requirements below:

• Package has a README.md file in the root directory.

The README should include, from top to bottom:

• The package name
• Badges for:
  • Continuous integration and test coverage,
  • Docs building (if you have a documentation website),
  • A repostatus.org badge,
  • Python versions supported,
  • Current package version (on PyPI / Conda).

NOTE: If the README has many more badges, you might want to consider using a table for badges: see this example. Such a table should be more wide than high. (Note that the a badge for pyOpenSci peer-review will be provided upon acceptance.)

• Short description of package goals.
• Package installation instructions
• Any additional setup required to use the package (authentication tokens, etc.)
• Descriptive links to all vignettes. If the package is small, there may only be a need for one vignette which could be placed in the README.md file.
  • Brief demonstration of package usage (as it makes sense - links to vignettes could also suffice here if package description is clear)
• Link to your documentation website.
• If applicable, how the package compares to other similar packages and/or how it relates to other packages in the scientific ecosystem.
• Citation information

Usability

Reviewers are encouraged to submit suggestions (or pull requests) that will improve the usability of the package as a whole.
Package structure should follow general community best-practices. In general please consider whether:

• Package documentation is clear and easy to find and use.
• The need for the package is clear
• All functions have documentation and associated examples for use
• The package is easy to install

Functionality

• Installation: Installation succeeds as documented.
• Functionality: Any functional claims of the software been confirmed.
• Performance: Any performance claims of the software been confirmed.
• Automated tests: Tests cover essential functions of the package and a reasonable range of inputs and conditions. All tests pass on the local machine.
• Continuous Integration: Has continuous integration setup (We suggest using Github actions but any CI platform is acceptable for review)
• Packaging guidelines: The package conforms to the pyOpenSci packaging guidelines.
  A few notable highlights to look at:
  • Package supports modern versions of Python and not End of life versions.
  • Code format is standard throughout package and follows PEP 8 guidelines (CI tests for linting pass)

For packages also submitting to JOSS

• The package has an obvious research application according to JOSS's definition in their submission requirements.

Note: Be sure to check this carefully, as JOSS's submission requirements and scope differ from pyOpenSci's in terms of what types of packages are accepted.

The package contains a paper.md matching JOSS's requirements with:

• A short summary describing the high-level functionality of the software
• Authors: A list of authors with their affiliations
• A statement of need clearly stating problems the software is designed to solve and its target audience.
• References: With DOIs for all those that have one (e.g. papers, datasets, software).

Final approval (post-review)

• The author has responded to my review and made changes to my satisfaction. I recommend approving this package.

Estimated hours spent reviewing:

--- 1 hr

Review Comments

• Found this project to be very interesting and unique. Functions are well-designed and have great docstrings with unit tests. The tests in the testing folder are also very exhaustive.
• One of the imports in the Usage section throws an error when copied directly from the README file, maybe just a typo update.

• Github Project Structure looks great - all issues closed, in the completed tab.
• CI CD workflow integrates really well with the code and with the entire workflow.
• The visualisation of the predictions is a great feature that has been added.
• The predictions can be reported with the accuracy or error metrics for better understanding of how much we can trust the model.
• Overall great package!

[carolinetang77]

Package Review

Please check off boxes as applicable, and elaborate in comments below. Your review is not limited to these topics, as described in the reviewer guide

• As the reviewer I confirm that there are no conflicts of interest for me to review this work (If you are unsure whether you are in conflict, please speak to your editor before starting your review).

Documentation

The package includes all the following forms of documentation:

• A statement of need clearly stating problems the software is designed to solve and its target audience in README.
• Installation instructions: for the development version of the package and any non-standard dependencies in README.
• Vignette(s) demonstrating major functionality that runs successfully locally.
• Function Documentation: for all user-facing functions.
• Examples for all user-facing functions.
• Community guidelines including contribution guidelines in the README or CONTRIBUTING.
• Metadata including author(s), author e-mail(s), a url, and any other relevant metadata e.g., in a pyproject.toml file or elsewhere.

Readme file requirements
The package meets the readme requirements below:

• Package has a README.md file in the root directory.

The README should include, from top to bottom:

• The package name
• Badges for:
  • Continuous integration and test coverage,
  • Docs building (if you have a documentation website),
  • A repostatus.org badge,
  • Python versions supported,
  • Current package version (on PyPI / Conda).

NOTE: If the README has many more badges, you might want to consider using a table for badges: see this example. Such a table should be more wide than high. (Note that the a badge for pyOpenSci peer-review will be provided upon acceptance.)

• Short description of package goals.
• Package installation instructions
• Any additional setup required to use the package (authentication tokens, etc.)
• Descriptive links to all vignettes. If the package is small, there may only be a need for one vignette which could be placed in the README.md file.
  • Brief demonstration of package usage (as it makes sense - links to vignettes could also suffice here if package description is clear)
• Link to your documentation website.
• If applicable, how the package compares to other similar packages and/or how it relates to other packages in the scientific ecosystem.
• Citation information

Usability

Reviewers are encouraged to submit suggestions (or pull requests) that will improve the usability of the package as a whole.
Package structure should follow general community best-practices. In general please consider whether:

• Package documentation is clear and easy to find and use.
• The need for the package is clear
• All functions have documentation and associated examples for use
• The package is easy to install

Functionality

• Installation: Installation succeeds as documented.
• Functionality: Any functional claims of the software been confirmed.
• Performance: Any performance claims of the software been confirmed.
• Automated tests: Tests cover essential functions of the package and a reasonable range of inputs and conditions. All tests pass on the local machine.
• Continuous Integration: Has continuous integration setup (We suggest using Github actions but any CI platform is acceptable for review)
• Packaging guidelines: The package conforms to the pyOpenSci packaging guidelines.
  A few notable highlights to look at:
  • Package supports modern versions of Python and not End of life versions.
  • Code format is standard throughout package and follows PEP 8 guidelines (CI tests for linting pass)

For packages also submitting to JOSS

• The package has an obvious research application according to JOSS's definition in their submission requirements.

Note: Be sure to check this carefully, as JOSS's submission requirements and scope differ from pyOpenSci's in terms of what types of packages are accepted.

The package contains a paper.md matching JOSS's requirements with:

• A short summary describing the high-level functionality of the software
• Authors: A list of authors with their affiliations
• A statement of need clearly stating problems the software is designed to solve and its target audience.
• References: With DOIs for all those that have one (e.g. papers, datasets, software).

Final approval (post-review)

• The author has responded to my review and made changes to my satisfaction. I recommend approving this package.

Estimated hours spent reviewing: 1

---

Review Comments

• Very interesting package! I definitely would consider using it if/when looking for a new (used) car and would be interested to see if it could be adapted to other types of cars :)
• There are some minor grammar mistakes in the first paragraph of the README, but nothing that really detracts from the overall point.
• The Usage section of the README looks like it needs to be updated; it imports functions from mercedestrenz.modelling but on ReadTheDocs it imports the same functions from mercedestrenz.train and mercedestrenz.predict.
• This is just a minor suggestion, but in the contribution section of the README, it would be helpful to have links to the CONTRIBUTING and CONDUCT files when mentioned.
• In the plot_mercedes_price() graph, it's really cool that you can see the comparison to the median market price! However, it would be nice if you could add the actual value of the median (either in the title or as a line on the density graph), so that the user isn't guessing at it.
• It's a bit unclear if train_mercedes_price_prediction_model is a function that can be used by anyone; the function is imported in both the README and on ReadtheDocs, but it's never used in the examples, and it doesn't seem like the prediction function uses this function directly. The documentation also mentions that you have 4 main functions, but 5 are imported in the examples. If this is a function that other people can use, I would recommend adding a section in the examples about how to use it (even if the code doesn't necessarily work).
• Overall the functions are excellently documented! They're all easy to understand and use :)