[SPARK-29746][ML] Implement validateInputType in Normalizer/ElementwiseProduct/PolynomialExpansion

### What changes were proposed in this pull request?
This PR implements ```validateInput``` in ```ElementwiseProduct```, ```Normalizer``` and ```PolynomialExpansion```.

### Why are the changes needed?
```UnaryTransformer``` has abstract method ```validateInputType``` and call it in ```transformSchema```, but this method is not implemented in ```ElementwiseProduct```, ```Normalizer``` and ```PolynomialExpansion```.

### Does this PR introduce any user-facing change?
No

### How was this patch tested?
Existing tests

Closes #26388 from huaxingao/spark-29746.

Authored-by: Huaxin Gao <[email protected]>
Signed-off-by: Sean Owen <[email protected]>

Author: huaxingao

mllib/src/main/scala/org/apache/spark/ml/feature/ElementwiseProduct.scala

@@ -75,6 +75,11 @@ class ElementwiseProduct @Since("1.4.0") (@Since("1.4.0") override val uid: Stri
     }
   }
 
+  override protected def validateInputType(inputType: DataType): Unit = {
+    require(inputType.isInstanceOf[VectorUDT],
+      s"Input type must be ${(new VectorUDT).catalogString} but got ${inputType.catalogString}.")
+  }
+
   override protected def outputDataType: DataType = new VectorUDT()
 }
 

mllib/src/main/scala/org/apache/spark/ml/feature/Normalizer.scala

@@ -59,6 +59,11 @@ class Normalizer @Since("1.4.0") (@Since("1.4.0") override val uid: String)
     vector => normalizer.transform(OldVectors.fromML(vector)).asML
   }
 
+  override protected def validateInputType(inputType: DataType): Unit = {
+    require(inputType.isInstanceOf[VectorUDT],
+      s"Input type must be ${(new VectorUDT).catalogString} but got ${inputType.catalogString}.")
+  }
+
   override protected def outputDataType: DataType = new VectorUDT()
 }
 

mllib/src/main/scala/org/apache/spark/ml/feature/PolynomialExpansion.scala

@@ -68,6 +68,11 @@ class PolynomialExpansion @Since("1.4.0") (@Since("1.4.0") override val uid: Str
     PolynomialExpansion.expand(v, $(degree))
   }
 
+  override protected def validateInputType(inputType: DataType): Unit = {
+    require(inputType.isInstanceOf[VectorUDT],
+      s"Input type must be ${(new VectorUDT).catalogString} but got ${inputType.catalogString}.")
+  }
+
   override protected def outputDataType: DataType = new VectorUDT()
 
   @Since("1.4.1")