{"action":"created","comment":{"url":"https://api.github.com/repos/apache/spark/pulls/comments/172139633","pull_request_review_id":101105295,"id":172139633,"diff_hunk":"@@ -351,17 +359,21 @@ private[ml] object DefaultParamsReader {\n       timestamp: Long,\n       sparkVersion: String,\n       params: JValue,\n+      defaultParams: JValue,\n       metadata: JValue,\n       metadataJson: String) {\n \n     /**\n      * Get the JSON value of the [[org.apache.spark.ml.param.Param]] of the given name.\n      * This can be useful for getting a Param value before an instance of `Params`\n      * is available.\n+     *\n+     * @param isDefaultParam Whether the given param name is a default param. Default is false.\n      */\n-    def getParamValue(paramName: String): JValue = {\n+    def getParamValue(paramName: String, isDefaultParam: Boolean = false): JValue = {","path":"mllib/src/main/scala/org/apache/spark/ml/util/ReadWrite.scala","position":72,"original_position":72,"commit_id":"69648d67546b292037d26ef3a282bf26afd4863e","original_commit_id":"69648d67546b292037d26ef3a282bf26afd4863e","user":{"login":"WeichenXu123","id":19235986,"avatar_url":"https://avatars0.githubusercontent.com/u/19235986?v=4","gravatar_id":"","url":"https://api.github.com/users/WeichenXu123","html_url":"https://github.com/WeichenXu123","followers_url":"https://api.github.com/users/WeichenXu123/followers","following_url":"https://api.github.com/users/WeichenXu123/following{/other_user}","gists_url":"https://api.github.com/users/WeichenXu123/gists{/gist_id}","starred_url":"https://api.github.com/users/WeichenXu123/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/WeichenXu123/subscriptions","organizations_url":"https://api.github.com/users/WeichenXu123/orgs","repos_url":"https://api.github.com/users/WeichenXu123/repos","events_url":"https://api.github.com/users/WeichenXu123/events{/privacy}","received_events_url":"https://api.github.com/users/WeichenXu123/received_events","type":"User","site_admin":false},"body":"Should the logic be \"lookup params first, if not exist then lookup defaultParams\" ?\r\nIf so, we don't need the `isDefaultParam` param.","created_at":"2018-03-05T10:14:11Z","updated_at":"2018-03-05T10:34:00Z","html_url":"https://github.com/apache/spark/pull/20633#discussion_r172139633","pull_request_url":"https://api.github.com/repos/apache/spark/pulls/20633","author_association":"CONTRIBUTOR","_links":{"self":{"href":"https://api.github.com/repos/apache/spark/pulls/comments/172139633"},"html":{"href":"https://github.com/apache/spark/pull/20633#discussion_r172139633"},"pull_request":{"href":"https://api.github.com/repos/apache/spark/pulls/20633"}}},"pull_request":{"url":"https://api.github.com/repos/apache/spark/pulls/20633","id":169775198,"html_url":"https://github.com/apache/spark/pull/20633","diff_url":"https://github.com/apache/spark/pull/20633.diff","patch_url":"https://github.com/apache/spark/pull/20633.patch","issue_url":"https://api.github.com/repos/apache/spark/issues/20633","number":20633,"state":"open","locked":false,"title":"[SPARK-23455][ML] Default Params in ML should be saved separately in metadata","user":{"login":"viirya","id":68855,"avatar_url":"https://avatars1.githubusercontent.com/u/68855?v=4","gravatar_id":"","url":"https://api.github.com/users/viirya","html_url":"https://github.com/viirya","followers_url":"https://api.github.com/users/viirya/followers","following_url":"https://api.github.com/users/viirya/following{/other_user}","gists_url":"https://api.github.com/users/viirya/gists{/gist_id}","starred_url":"https://api.github.com/users/viirya/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/viirya/subscriptions","organizations_url":"https://api.github.com/users/viirya/orgs","repos_url":"https://api.github.com/users/viirya/repos","events_url":"https://api.github.com/users/viirya/events{/privacy}","received_events_url":"https://api.github.com/users/viirya/received_events","type":"User","site_admin":false},"body":"## What changes were proposed in this pull request?\r\n\r\nWe save ML's user-supplied params and default params as one entity in metadata. During loading the saved models, we set all the loaded params into created ML model instances as user-supplied params.\r\n\r\nIt causes some problems, e.g., if we strictly disallow some params to be set at the same time, a default param can fail the param check because it is treated as user-supplied param after loading.\r\n\r\nThe loaded default params should not be set as user-supplied params. We should save ML default params separately in metadata.\r\n\r\nFor backward compatibility, when loading metadata, if it is a metadata file from previous Spark, we shouldn't raise error if we can't find the default param field.\r\n\r\n## How was this patch tested?\r\n\r\nPass existing tests and added 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