made changes from PR comments

Author: ELin2025

amber/operator-requirements.txt

@@ -24,3 +24,4 @@ torch==2.8.0
 scikit-learn==1.5.0
 transformers==4.57.3
 boto3==1.40.53
+scikit-image==0.26.0

common/workflow-operator/src/main/scala/org/apache/texera/amber/operator/visualization/ternaryContour/TernaryContourOpDesc.scala

@@ -69,7 +69,7 @@ class TernaryContourOpDesc extends PythonOperatorDescriptor {
     OperatorInfo(
       userFriendlyName = "Ternary Contour",
       operatorDescription =
-        "A ternary contour plot shows how a measured value changes across all mixtures of three components that always sum to a constant (usually 100%).",
+        "Shows how a measured value changes across all mixtures of three components that sum to a constant",
       operatorGroupName = OperatorGroupConstants.VISUALIZATION_SCIENTIFIC_GROUP,
       inputPorts = List(InputPort()),
       outputPorts = List(OutputPort(mode = OutputMode.SINGLE_SNAPSHOT))
@@ -81,7 +81,6 @@ class TernaryContourOpDesc extends PythonOperatorDescriptor {
     val outputSchema = Schema()
       .add("html-content", AttributeType.STRING)
     Map(operatorInfo.outputPorts.head.id -> outputSchema)
-    Map(operatorInfo.outputPorts.head.id -> outputSchema)
   }
 
   /** Returns a Python string that drops any tuples with missing values */
@@ -120,7 +119,6 @@ class TernaryContourOpDesc extends PythonOperatorDescriptor {
       pyb"""
          |from pytexera import *
          |
-         |import plotly.express as px
          |import plotly.io
          |import plotly.figure_factory as ff
          |import numpy as np