Hi Mirmal
Filter works fine if I want handle one of grouped dataframe. But I has
multiple grouped dataframe, I wish I can apply ML algorithm to all of them
in one job, but not in for loops.
Wenpei.
From: Nirmal Fernando <nir...@wso2.com>
To: Wen Pei Yu/China/IBM@IBMCN
Cc: User <user@spark.apache.org>
Date: 08/23/2016 01:55 PM
Subject: Re: Apply ML to grouped dataframe
On Tue, Aug 23, 2016 at 10:56 AM, Wen Pei Yu <yuw...@cn.ibm.com> wrote:
We can group a dataframe by one column like
df.groupBy(df.col("gender"))
On top of this DF, use a filter that would enable you to extract the
grouped DF as separated DFs. Then you can apply ML on top of each DF.
eg: xyzDF.filter(col("x").equalTo(x))
It like split a dataframe to multiple dataframe. Currently, we can only
apply simple sql function to this GroupedData like agg, max etc.
What we want is apply one ML algorithm to each group.
Regards.
Inactive hide details for Nirmal Fernando ---08/23/2016 01:14:48 PM---Hi
Wen, AFAIK Spark MLlib implements its machine learningNirmal Fernando
---08/23/2016 01:14:48 PM---Hi Wen, AFAIK Spark MLlib implements its
machine learning algorithms on top of
From: Nirmal Fernando <nir...@wso2.com>
To: Wen Pei Yu/China/IBM@IBMCN
Cc: User <user@spark.apache.org>
Date: 08/23/2016 01:14 PM
Subject: Re: Apply ML to grouped dataframe
Hi Wen,
AFAIK Spark MLlib implements its machine learning algorithms on top of
Spark dataframe API. What did you mean by a grouped dataframe?
On Tue, Aug 23, 2016 at 10:42 AM, Wen Pei Yu <yuw...@cn.ibm.com> wrote:
Hi Nirmal
I didn't get your point.
Can you tell me more about how to use MLlib to grouped dataframe?
Regards.
Wenpei.
Inactive hide details for Nirmal Fernando ---08/23/2016 10:26:36
AM---You can use Spark MLlib http://spark.apache.org/docs/late
Nirmal Fernando ---08/23/2016 10:26:36 AM---You can use Spark MLlib
http://spark.apache.org/docs/latest/ml-guide.html#announcement-dataframe-bas
From: Nirmal Fernando <nir...@wso2.com>
To: Wen Pei Yu/China/IBM@IBMCN
Cc: User <user@spark.apache.org>
Date: 08/23/2016 10:26 AM
Subject: Re: Apply ML to grouped dataframe
You can use Spark MLlib
http://spark.apache.org/docs/latest/ml-guide.html#announcement-dataframe-based-api-is-primary-api
On Tue, Aug 23, 2016 at 7:34 AM, Wen Pei Yu <yuw...@cn.ibm.com>
wrote:
Hi
We have a dataframe, then want group it and apply a ML
algorithm or statistics(say t test) to each one. Is
there any efficient way for this situation?
Currently, we transfer to pyspark, use groupbykey and
apply numpy function to array. But this wasn't an
efficient way, right?
Regards.
Wenpei.
--
Thanks & regards,
Nirmal
Team Lead - WSO2 Machine Learner
Associate Technical Lead - Data Technologies Team, WSO2 Inc.
Mobile: +94715779733
Blog: http://nirmalfdo.blogspot.com/
--
Thanks & regards,
Nirmal
Team Lead - WSO2 Machine Learner
Associate Technical Lead - Data Technologies Team, WSO2 Inc.
Mobile: +94715779733
Blog: http://nirmalfdo.blogspot.com/
--
Thanks & regards,
Nirmal
Team Lead - WSO2 Machine Learner
Associate Technical Lead - Data Technologies Team, WSO2 Inc.
Mobile: +94715779733
Blog: http://nirmalfdo.blogspot.com/
