code: public CompareFacesResult withUnmatchedFaces(ComparedFace... unmatchedFaces) {
          if (this.unmatchedFaces == null) {
              setUnmatchedFaces(new java.util.ArrayList<ComparedFace>(unmatchedFaces.length));
          }
          for (ComparedFace ele : unmatchedFaces) {
              this.unmatchedFaces.add(ele);
          }
          return this;
      }
docs: <p>
  An array of faces in the target image that did not match the source image face.
  </p>
  <p>
  <b>NOTE:</b> This method appends the values to the existing list (if any). Use
  {@link #setUnmatchedFaces(java.util.Collection)} or {@link #withUnmatchedFaces(java.util.Collection)} if you want
  to override the existing values.
  </p>
  
  @param unmatchedFaces
  An array of faces in the target image that did not match the source image face.
  @return Returns a reference to this object so that method calls can be chained together.