      built-in model, so no training is necessary. The Detect faces method does not support general biometric facial
      recognition.
      Supported image formats include .gif, .jpg, .png, and .tif. The maximum image size is 10 MB. The minimum
-     recommended pixel density is 32X32 pixels, but the service tends to perform better with images that are at least
-     224 x 224 pixels.
+     recommended pixel density is 32X32 pixels per inch.
 
      - parameter imagesFile: An image file (gif, .jpg, .png, .tif.) or .zip file with images. Limit the .zip file to
        100 MB. You can include a maximum of 15 images in a request.

        )

        // execute REST request
        request.responseObject(completionHandler: completionHandler)
    }

    /**

    /**
     Update a classifier.

     Update a custom classifier by adding new positive or negative classes (examples) or by adding new images to
     existing classes. You must supply at least one set of positive or negative examples. For details, see [Updating
     custom
     classifiers](https://cloud.ibm.com/docs/services/visual-recognition/customizing.html#updating-custom-classifiers).
     Encode all names in UTF-8 if they contain non-ASCII characters (.zip and image file names, and classifier and class
     names). The service assumes UTF-8 encoding if it encounters non-ASCII characters.
