LOL. yes indeed. Previous one from the Lloyds Banking Group and this one from TCS that provides services to the same company.

Just slightly different wording but the same content



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On Wed, 7 Apr 2021 at 17:54, Sean Owen <srowen@gmail.com> wrote:
I think this question was asked just a week ago? same company and setup.

https://mail-archives.apache.org/mod_mbox/spark-user/202104.mbox/%3CLNXP123MB2604758548BE38E8D3F369EC8A7B9%40LNXP123MB2604.GBRP123.PROD.OUTLOOK.COM%3E

On Wed, Apr 7, 2021 at 11:17 AM SRITHALAM, ANUPAMA (Risk Value Stream) <Anupama.Srithalam@lloydsbanking.com.invalid> wrote:

Classification: Limited


Hi Team,

 

We are trying to use Gradient Boosting Classification algorithm and in Python we tried using Sklearn library and in Pyspark we are using ML library.

 

We have around 45k dataset which is used for training and that dataset is taking around 3 to 4 hours in python but in Pyspark it is taking more than 18 hours for the same hyper parameters used between Python and Pyspark.

 

We tried Pyspark by repartitioning the dataframe and can see a little improvement in performance but still we are not able to get timings near to Python.

 

We have live run which need to evaluation predictions for 40million plus data and data resides in Hadoop. So it is difficult to get that huge amount to data to different system and convert to Pandas dataframe and run against Python.

 

So we are trying to train the same model against Pyspark so, that I can do the evaluation against trained model in Pyspark but, here the concern that we have is the time taken for training is very high and we want to check what will be the general approach followed in these kind of scenarios.

 

 

Thanks,

Anupama.

Lloyds Banking Group plc. Registered Office: The Mound, Edinburgh EH1 1YZ. Registered in Scotland no. SC95000. Telephone: 0131 225 4555.

Lloyds Bank plc. Registered Office: 25 Gresham Street, London EC2V 7HN. Registered in England and Wales no. 2065. Telephone 0207626 1500.

Bank of Scotland plc. Registered Office: The Mound, Edinburgh EH1 1YZ. Registered in Scotland no. SC327000. Telephone: 03457 801 801.

Lloyds Bank Corporate Markets plc. Registered office: 25 Gresham Street, London EC2V 7HN. Registered in England and Wales no. 10399850.

Scottish Widows Schroder Personal Wealth Limited. Registered Office: 25 Gresham Street, London EC2V 7HN. Registered in England and Wales no. 11722983.

Lloyds Bank plc, Bank of Scotland plc and Lloyds Bank Corporate Markets plc are authorised by the Prudential Regulation Authority and regulated by the Financial Conduct Authority and Prudential Regulation Authority.

Scottish Widows Schroder Personal Wealth Limited is authorised and regulated by the Financial Conduct Authority.

Lloyds Bank Corporate Markets Wertpapierhandelsbank GmbH is a wholly-owned subsidiary of Lloyds Bank Corporate Markets plc. Lloyds Bank Corporate Markets Wertpapierhandelsbank GmbH has its registered office at Thurn-und-Taxis Platz 6, 60313 Frankfurt, Germany. The company is registered with the Amtsgericht Frankfurt am Main, HRB 111650. Lloyds Bank Corporate Markets Wertpapierhandelsbank GmbH is supervised by the Bundesanstalt für Finanzdienstleistungsaufsicht.

Halifax is a division of Bank of Scotland plc.

HBOS plc. Registered Office: The Mound, Edinburgh EH1 1YZ. Registered in Scotland no. SC218813.


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