huaxingao opened a new pull request #27122: [SPARK-30452][ML][PySpark] Add 
predict and numFeatures in Python IsotonicRegressionModel
URL: https://github.com/apache/spark/pull/27122
 
 
   ### What changes were proposed in this pull request?
   Add ```predict``` and ```numFeatures``` in Python 
```IsotonicRegressionModel```
   
   ### Why are the changes needed?
   ```IsotonicRegressionModel``` doesn't extend ```JavaPredictionModel```,  so 
it doesn't get ```predict``` and ```numFeatures``` from the super class.
   
   
   ### Does this PR introduce any user-facing change?
   Yes. Python version of 
   ```
   IsotonicRegressionModel.predict
   IsotonicRegressionModel.numFeatures
   ```
   
   ### How was this patch tested?
   doctest
   

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