java.lang.NullPointerException during Apply Model

reyvababtista
reyvababtista Altair Community Member
in Community Q&A

Hi, I'm getting java.lang.NullPointerException error when applying a Fast Large Margin model. Does anyone know how to fix this? Thanks!

ERROR MESSAGE

Apr 23

2025 1:45:47 PM SEVERE: Process failed: operator cannot be executed. Check the log messages...

Apr 23

2025 1:45:47 PM SEVERE: Here:

Apr 23

2025 1:45:47 PM SEVERE: Process[1] (Process)

Apr 23

2025 1:45:47 PM SEVERE: subprocess 'Main Process'

Apr 23

2025 1:45:47 PM SEVERE: +- Retrieve HIDEMA1Scored_03.19.25_test[1] (Retrieve)

Apr 23

2025 1:45:47 PM SEVERE: +- Select Attributes[1] (Select Attributes)

Apr 23

2025 1:45:47 PM SEVERE: +- Set Role[1] (Set Role)

Apr 23

2025 1:45:47 PM SEVERE: +- Multiply[1] (Multiply)

Apr 23

2025 1:45:47 PM SEVERE: +- Retrieve HIDEMA1Scored_03.19.25_train[1] (Retrieve)

Apr 23

2025 1:45:47 PM SEVERE: +- Select Attributes (3)[1] (Select Attributes)

Apr 23

2025 1:45:47 PM SEVERE: +- Set Role (2)[1] (Set Role)

Apr 23

2025 1:45:47 PM SEVERE: +- Retrieve fast large margin[1] (Retrieve)

Apr 23

2025 1:45:47 PM SEVERE: ==> +- Apply Model[1] (Apply Model)

Apr 23

2025 1:45:47 PM SEVERE: +- Performance[0] (Performance)

Apr 23

2025 1:45:47 PM SEVERE: +- KernelSHAP[0] (Generate Interpretation)

Apr 23

2025 1:45:47 PM SEVERE: java.lang.NullPointerException

PROCESS XML

<?xml version="1.0" encoding="UTF-8"?><process version="10.4.003">  <context>    <input/>    <output/>    <macros/>  </context>  <operator activated="true" class="process" compatibility="10.4.003" expanded="true" name="Process">    <parameter key="logverbosity" value="init"/>    <parameter key="random_seed" value="2001"/>    <parameter key="send_mail" value="never"/>    <parameter key="notification_email" value=""/>    <parameter key="process_duration_for_mail" value="30"/>    <parameter key="encoding" value="SYSTEM"/>    <process expanded="true">      <operator activated="true" class="retrieve" compatibility="10.4.003" expanded="true" height="68" name="Retrieve HIDEMA1Scored_03.19.25_test" width="90" x="112" y="85">        <parameter key="repository_entry" value="../data/HIDEMA1Scored_03.19.25_test"/>      </operator>      <operator activated="true" class="blending:select_attributes" compatibility="10.4.003" expanded="true" height="82" name="Select Attributes" width="90" x="313" y="34">        <parameter key="type" value="exclude attributes"/>        <parameter key="attribute_filter_type" value="a subset"/>        <parameter key="select_attribute" value=""/>        <parameter key="select_subset" value="ID␞IsNotDrinking␞TDRKNM_lag_1␞TDRKNM_lag_1_missing"/>        <parameter key="also_apply_to_special_attributes_(id,_label..)" value="false"/>      </operator>      <operator activated="true" class="blending:set_role" compatibility="10.4.003" expanded="true" height="82" name="Set Role" width="90" x="447" y="34">        <list key="set_roles">          <parameter key="IsDrinking" value="label"/>        </list>      </operator>      <operator activated="true" class="multiply" compatibility="10.4.003" expanded="true" height="103" name="Multiply" width="90" x="648" y="136"/>      <operator activated="true" class="retrieve" compatibility="10.4.003" expanded="true" height="68" name="Retrieve HIDEMA1Scored_03.19.25_train" width="90" x="112" y="238">        <parameter key="repository_entry" value="../data/HIDEMA1Scored_03.19.25_train"/>      </operator>      <operator activated="true" class="blending:select_attributes" compatibility="10.4.003" expanded="true" height="82" name="Select Attributes (3)" width="90" x="313" y="238">        <parameter key="type" value="exclude attributes"/>        <parameter key="attribute_filter_type" value="a subset"/>        <parameter key="select_attribute" value=""/>        <parameter key="select_subset" value="ID␞IsNotDrinking␞TDRKNM_lag_1␞TDRKNM_lag_1_missing"/>        <parameter key="also_apply_to_special_attributes_(id,_label..)" value="false"/>      </operator>      <operator activated="true" class="blending:set_role" compatibility="10.4.003" expanded="true" height="82" name="Set Role (2)" width="90" x="447" y="238">        <list key="set_roles">          <parameter key="IsDrinking" value="label"/>        </list>      </operator>      <operator activated="true" class="retrieve" compatibility="10.4.003" expanded="true" height="68" name="Retrieve fast large margin" width="90" x="581" y="34">        <parameter key="repository_entry" value="../model/fast large margin"/>      </operator>      <operator activated="true" class="apply_model" compatibility="10.4.003" expanded="true" height="82" name="Apply Model" width="90" x="782" y="85">        <list key="application_parameters"/>      </operator>      <operator activated="true" class="performance" compatibility="10.4.003" expanded="true" height="82" name="Performance" width="90" x="916" y="34">        <parameter key="use_example_weights" value="true"/>      </operator>      <operator activated="true" class="interpretation:generate_interpretation" compatibility="0.8.000" expanded="true" height="124" name="KernelSHAP" width="90" x="916" y="136">        <parameter key="algorithm" value="KernelSHAP"/>        <parameter key="sample_size" value="100"/>        <parameter key="redraw_local_samples" value="true"/>        <parameter key="explanation_algorithm" value="Correlation"/>        <parameter key="locality" value="0.2"/>        <parameter key="maximal_explaining_attributes" value="3"/>        <parameter key="use_local_random_seed" value="true"/>        <parameter key="local_random_seed" value="1992"/>      </operator>      <connect from_op="Retrieve HIDEMA1Scored_03.19.25_test" from_port="output" to_op="Select Attributes" to_port="example set input"/>      <connect from_op="Select Attributes" from_port="example set output" to_op="Set Role" to_port="example set input"/>      <connect from_op="Set Role" from_port="example set output" to_op="Multiply" to_port="input"/>      <connect from_op="Multiply" from_port="output 1" to_op="Apply Model" to_port="unlabelled data"/>      <connect from_op="Multiply" from_port="output 2" to_op="KernelSHAP" to_port="test"/>      <connect from_op="Retrieve HIDEMA1Scored_03.19.25_train" from_port="output" to_op="Select Attributes (3)" to_port="example set input"/>      <connect from_op="Select Attributes (3)" from_port="example set output" to_op="Set Role (2)" to_port="example set input"/>      <connect from_op="Set Role (2)" from_port="example set output" to_op="KernelSHAP" to_port="training"/>      <connect from_op="Retrieve fast large margin" from_port="output" to_op="Apply Model" to_port="model"/>      <connect from_op="Apply Model" from_port="labelled data" to_op="Performance" to_port="labelled data"/>      <connect from_op="Apply Model" from_port="model" to_op="KernelSHAP" to_port="mod"/>      <connect from_op="Performance" from_port="performance" to_port="result 1"/>      <connect from_op="KernelSHAP" from_port="importance" to_port="result 2"/>      <connect from_op="KernelSHAP" from_port="global weights" to_port="result 3"/>      <portSpacing port="source_input 1" spacing="0"/>      <portSpacing port="sink_result 1" spacing="0"/>      <portSpacing port="sink_result 2" spacing="0"/>      <portSpacing port="sink_result 3" spacing="0"/>      <portSpacing port="sink_result 4" spacing="0"/>    </process>  </operator></process>
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Answers

  • RolandJones
    RolandJones
    Altair Employee

    Hi @reyvababtista,

    It looks like this error occurs in the Generate Interpretation. Would you be able to share the inputs to the process so I can replicate on my side?

    Many thanks,

    Roland

  • reyvababtista
    reyvababtista Altair Community Member

    Hi @RolandJones,

    Please see the attached files. I’ve included the Fast Large Margin and SVM models, as they both exhibit the same error in my pipeline. These models were saved from Auto Model’s production steps using the attached training set.

    debug.zip
  • reyvababtista
    reyvababtista Altair Community Member

    Hi @RolandJones,

    Is there any update regarding this issue? Thank you so much for your time.

  • RolandJones
    RolandJones
    Altair Employee

    Hi @reyvababtista,

    Apologies for the delay. I've had a look at it seems like there's a mismatch between the types for the testing, and the data the model was trained on. You can see this in the Log panel if you turn it on in the top left > View > Show Panel > Log. I've attached the warnings below. I'd recommend as a first step, create a workflow including both the training of the model, and the generating of the interpretations, to see if that removes the error. I will also speak to the developers.

    Let me know how you get on. Best,

    Roland

    Example of one of the messages:

    Apr 29, 2025 8:23:02 PM WARNING: Kernel Model: The value types between training and application differ for attribute 'TSIT1_lag_1', training: real, application: polynominal

  • reyvababtista
    reyvababtista Altair Community Member
    edited April 29

    Hi @RolandJones,

    The warnings are there for other models I tried. However, other models are running fine on both training and testing sets, only Fast Large Margin and SVM that yield NullPointerException. Please let me know if you need anything else from me to help debug this problem. Thank you for looking into this.

    Rey

  • reyvababtista
    reyvababtista Altair Community Member

    Hi @RolandJones,

    Are there any updates regarding this issue yet? Thank you!

    Rey

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