Dan Martin Reading time ~5 minutes

MLOPs intro

Machine Learning is used in practically every industry these days, which is associated with Artificial Intelligence. Machine learning is used in a variety of fields, including medicine, eCommerce, and science. It is not difficult to find the most up-to-date machine learning tools, methodologies, procedures, and systems to construct Machine Learning Models to address a problem. The major challenge is keeping these models up to date on such a large scale. This article will explain the rise of MLOps monitoring in 2022.

The current paradigm in machine learning development depends on the cooperation of 4 main areas of study: Big Data, Data Science, Computer Engineering, and Machine Learning.

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Adrian Matei (aka adixchen) Reading time ~1 minute

The simplest way

git remote -v

#result something similar to the following
origin  git@github.com:CodepediaOrg/codepediaorg.github.io.git (fetch)
origin  git@github.com:CodepediaOrg/codepediaorg.github.io.git (push)

Tip to get only the remote URL:

git config --get remote.origin.url

#result something similar to the following
git@github.com:CodepediaOrg/codepediaorg.github.io.git

In order to get more details about a particular remote, use the git remote show [remote-name] command

git remote show origin # here "origin" is the remote name

#result something similar to the following
* remote origin
  Fetch URL: git@github.com:CodepediaOrg/codepediaorg.github.io.git
  Push  URL: git@github.com:CodepediaOrg/codepediaorg.github.io.git
  HEAD branch: master
  Remote branches:
    _posts/2016-08-26-migrate-rest-api-from-jboss-eap6-to-eap7 tracked
    add_multiple_authors_functionality                         tracked
    dependabot/npm_and_yarn/bl-1.2.3                           tracked
    dependabot/npm_and_yarn/grunt-1.3.0                        tracked
    dependabot/npm_and_yarn/hosted-git-info-2.8.9              tracked
    dependabot/npm_and_yarn/ini-1.3.7                          tracked
    dependabot/npm_and_yarn/is-svg-4.3.1                       tracked
    dependabot/npm_and_yarn/lodash-4.17.21                     tracked
    dependabot/npm_and_yarn/path-parse-1.0.7                   new (next fetch will store in remotes/origin)
    dependabot/npm_and_yarn/websocket-extensions-0.1.4         tracked
    feature/add-copy-button-for-code-snippets                  tracked
    feature/add-scroll-up-for-posts                            tracked
    feature/mongo-commands-via-collections                     tracked
    gh-pages                                                   tracked
    master                                                     tracked
    post/multiple-authors-jekyll                               tracked
    refs/remotes/origin/dependabot/npm_and_yarn/lodash-4.17.19 stale (use 'git remote prune' to remove)
    run-grunt                                                  tracked
  Local branches configured for 'git pull':
    master    merges with remote master
    run-grunt merges with remote run-grunt
  Local refs configured for 'git push':
    master    pushes to master    (up to date)
    run-grunt pushes to run-grunt (up to date)

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Adrian Matei (aka adixchen) Reading time ~1 minute

Use the find method of the EntityManager, where the primary key is provided as the second parameter:

@Stateless
public class PartnerRepository {

  @Inject private EntityManager em;

  public Optional<Partner> find(String partnerNumber) {
    return Optional.ofNullable(em.find(Partner.class, partnerNumber));
  }
}

The entity looks something like the following, with partnerNumber as primary key:

@Entity
@Access(AccessType.FIELD)
@Table(name = "T_PARTNER")
public class Partner {

  @Id
  @NotNull
  @Column(name = "PARTNER_NUMBER", nullable = false)
  private Integer partnerNumer;

  //other fields ignored for readability
}

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Reading time ~1 minute

The native SQL query we want to map in JPA is similar to the following:

SELECT * FROM PARTNER where PARTNER_NUMBER IN ('id1', 'idn').

With JPA you can use a TypedQuery for example and set the expected list of the IN clause directly as query parameter

@Stateless
public class PartnerDataRepository {

	@Inject private EntityManager em;

	public List<PartnerData> findPartnerDataFromList(
		List<String> partnerNumbers) {
	  TypedQuery<PartnerData> query =
		  em.createNamedQuery(
			  PartnerData.FIND_PARTNER_DATA_IN_LIST, PartnerData.class);
	  query.setParameter(PartnerData.PARTNER_NUMBERS, partnerNumbers);

	  return query.getResultList();
	}
}

In the named query itself you can pass the parameter with : as you would when setting a “normal” parameter:

@Entity
@Access(AccessType.FIELD)
@Inheritance(strategy = InheritanceType.SINGLE_TABLE)
@Table(name = PartnerData.TABLE_NAME)
@NamedQueries({
  @NamedQuery(
      name = PartnerData.FIND_PARTNER_DATA_IN_LIST,
      query = "select m from PartnerData m where partnerNumber in :partnerNumbers")
})
public class PartnerData {
  public static final String TABLE_NAME = "PARTNER";

  public static final String PARTNER_NUMBERS = "partnerNumbers";
  public static final String FIND_PARTNER_DATA_IN_LIST =
      "findPartnerDataWithPartnerNumbers";

  //... rest ignored for brevity
}

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Adrian Matei (aka adixchen) Reading time ~1 minute

The native SQL query we want to map in JPA is similar to the following:

select *
from PARTNER
where EVENT_TIMESTAMP >= timestamp '2021-09-17 10:00:00'
  and EVENT_TIMESTAMP < timestamp '2021-09-17 11:00:00'

where the two timestamps should come as query parameters.

With JPA you can use a TypedQuery for example and set the LocalDateTime values to query parameters via the setParameter method:

@Stateless
public class PartnerDataRepository {

    @Inject private EntityManager em;

    public List<PartnerData> findPartnerDataWithinInterval(
      LocalDateTime fromDatetime, LocalDateTime toDatetime) {
        TypedQuery<PartnerData> query =
            em.createNamedQuery(
                PartnerData.FIND_PARTNER_DATA_IN_TIME_INTERVAL, PartnerData.class);

        query.setParameter(PartnerData.FROM_DATETIME, fromDatetime);
        query.setParameter(PartnerData.TO_DATETIME, toDatetime);

        return query.getResultList();
    }
}

In the named query itself you can directly pass the parameters before : as usual, and the implementation (in my case Hibernate) takes care of the rest :

@Entity
@Access(AccessType.FIELD)
@Inheritance(strategy = InheritanceType.SINGLE_TABLE)
@Table(name = PartnerData.TABLE_NAME)
@NamedQueries({
 @NamedQuery(
      name = PartnerKerndaten.FIND_PARTNER_DATA_IN_TIME_INTERVAL,
      query = "select m from PartnerData m where eventTimestamp >= :fromDatetime and eventTimestamp < :toDatetime")
})
public class PartnerData {
  public static final String TABLE_NAME = "PARTNER";

  public static final String FROM_DATETIME = "fromDatetime";
  public static final String TO_DATETIME = "toDatetime";

  public static final String FIND_PARTNER_DATA_IN_TIME_INTERVAL =
      "findPartnerDataWithinInterval";

  //... rest ignored for brevity
}

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