August 15, 2023

tClassify – Docs for ESB 6.x

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  4. tClassify – Docs for ESB 6.x

tClassify

Predicts which class an element belongs to, based on the classifier model generated
by a model training component.

tClassify uses a given classifier
model to analyse datasets incoming from its preceding component in order to classify the
elements in the datasets.

Depending on the Talend solution you
are using, this component can be used in one, some or all of the following Job
frameworks:

tClassify properties for Apache Spark Batch

These properties are used to configure tClassify running in the Spark Batch Job framework.

The Spark Batch
tClassify component belongs to the Machine Learning family.

The component in this framework is available when you have subscribed to any Talend Platform product with Big Data or Talend Data
Fabric.

Basic settings

Schema and Edit
Schema

A schema is a row description. It defines the number of fields (columns) to
be processed and passed on to the next component. The schema is either Built-In or stored remotely in the Repository.

Click Edit schema to make changes to the schema.
If the current schema is of the Repository type, three
options are available:

  • View schema: choose this option to view the
    schema only.

  • Change to built-in property: choose this
    option to change the schema to Built-in for
    local changes.

  • Update repository connection: choose this
    option to change the schema stored in the repository and decide whether to propagate
    the changes to all the Jobs upon completion. If you just want to propagate the
    changes to the current Job, you can select No
    upon completion and choose this schema metadata again in the [Repository Content] window.

Note that the schema of this component is read-only. Its single column LABEL is used to load the class names from the classifier model
for use in the classification process.

Model on filesystem

Select this radio box if the model to be used is stored on a file system. The button for
browsing does not work with the Spark Local mode; if you
are using the Spark Yarn or the Spark Standalone mode, ensure that you have properly configured the connection in
a configuration component in the same Job, such as tHDFSConfiguration.

In the HDFS
folder field that is displayed, enter the HDFS URI in which this model is
stored.

Model computed in the current Job

Select this radio box and then select the model training component that is used in the
same Job to create the model to be used.

Usage

Usage rule

This component is used as an intermediate step.

Spark Connection

You need to use the Spark Configuration tab in
the Run view to define the connection to a given
Spark cluster for the whole Job. In addition, since the Job expects its dependent jar
files for execution, you must specify the directory in the file system to which these
jar files are transferred so that Spark can access these files:

  • Yarn mode: when using Google
    Dataproc, specify a bucket in the Google Storage staging
    bucket     field in the Spark
    configuration     tab; when using other distributions, use a
    tHDFSConfiguration
    component to specify the directory.

  • Standalone mode: you need to choose
    the configuration component depending on the file system you are using, such
    as tHDFSConfiguration
    or tS3Configuration.

This connection is effective on a per-Job basis.

Related scenario

For a scenario in which tClassify is used, see Creating a classification model to filter spam.

tClassify properties for Apache Spark Streaming

These properties are used to configure tClassify running in the Spark Streaming Job framework.

The Spark Streaming
tClassify component belongs to the Machine Learning family.

The component in this framework is available only if you have subscribed to Talend Real-time Big Data Platform or Talend Data
Fabric.

Basic settings

Schema and Edit
Schema

A schema is a row description. It defines the number of fields (columns) to
be processed and passed on to the next component. The schema is either Built-In or stored remotely in the Repository.

Click Edit schema to make changes to the schema.
If the current schema is of the Repository type, three
options are available:

  • View schema: choose this option to view the
    schema only.

  • Change to built-in property: choose this
    option to change the schema to Built-in for
    local changes.

  • Update repository connection: choose this
    option to change the schema stored in the repository and decide whether to propagate
    the changes to all the Jobs upon completion. If you just want to propagate the
    changes to the current Job, you can select No
    upon completion and choose this schema metadata again in the [Repository Content] window.

Note that the schema of this component is read-only. Its single column LABEL is used to load the class names from the classifier model
for use in the classification process.

Model on filesystem

Select this radio box if the model to be used is stored on a file system. The button for
browsing does not work with the Spark Local mode; if you
are using the Spark Yarn or the Spark Standalone mode, ensure that you have properly configured the connection in
a configuration component in the same Job, such as tHDFSConfiguration.

In the HDFS
folder field that is displayed, enter the HDFS URI in which this model is
stored.

Usage

Usage rule

This component is used as an intermediate step.

Spark Connection

You need to use the Spark Configuration tab in
the Run view to define the connection to a given
Spark cluster for the whole Job. In addition, since the Job expects its dependent jar
files for execution, you must specify the directory in the file system to which these
jar files are transferred so that Spark can access these files:

  • Yarn mode: when using Google
    Dataproc, specify a bucket in the Google Storage staging
    bucket     field in the Spark
    configuration     tab; when using other distributions, use a
    tHDFSConfiguration
    component to specify the directory.

  • Standalone mode: you need to choose
    the configuration component depending on the file system you are using, such
    as tHDFSConfiguration
    or tS3Configuration.

This connection is effective on a per-Job basis.

Related scenarios

No scenario is available for the Spark Streaming version of this component
yet.

Document get from Talend https://help.talend.com
Thank you for watching.
Docs 6.x
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