MLF-STF communication

MLF can be used in combination with the PTV Optima Short-Term Forecast (STF) module, feeding the latter with its measure predictions, greatly enhancing the forecast quality of the simulation-based approach.

In this case is necessary to enable the communication between STF and MLF, acting on CommandlineTDE.csv file.

CommandlineTDE.csv

In the CommandlineTDE.csv it's necessary to set the datasource DS_TSTA_FORECAST:

DS_TSTA_FORECAST
webservice:https://<apache-load-balancer-ip-address>

It's not necessary to specify the port.

Example of Apache configuration with three Machine Learning Forecast servers

You can consider a configuration for:

Two application servers: AS1 and AS2
Three servers hosting Machine Learning Forecast (MLF): MLF1, MLF2, and MLF3
The node hosting Apache: Proxy1.

<VirtualHost _default_:443> 

# SSL configurations, can vary depending on the actual setup 

SSLEngine on 
SSLProxyEngine on 
SSLProxyVerify none 
SSLProxyCheckPeerCN off 
SSLProxyCheckPeerName off 
SSLProxyCheckPeerExpire off 
SSLCertificateFile "${SRVROOT}/conf/certificate.crt" 
SSLCertificateKeyFile "${SRVROOT}/conf/privateKey.key" 

# end SSL configurations 

RewriteEngine On 
ProxyPreserveHost On 
RewriteCond %{HTTP:Upgrade} =websocket [NC] 
RewriteRule /(.*)           wss://as1:8443/$1 [P,L] 

# managing MLF traffic 

<Proxy "balancer://mlf-api-processing-api"> 
	
	ProxySet lbmethod=bybusyness 
		BalancerMember "https://mlf1/mlf-api-processing-api" 			
		BalancerMember "https://mlf2/mlf-api-processing-api" 			
		BalancerMember "https://mlf3/mlf-api-processing-api" 
	
</Proxy> 
	
<Proxy "balancer://mlf-forecast-results-processing-api"> 

	ProxySet lbmethod=bybusyness 
		BalancerMember "https://mlf1/mlf-forecast-results-processing-api" 			
		BalancerMember "https://mlf2/mlf-forecast-results-processing-api" 		
		BalancerMember "https://mlf3/mlf-forecast-results-processing-api" 
	
</Proxy> 

ProxyPass /ml-forecast/ "balancer://mlf-api-processing-api/"
ProxyPassReverse /ml-forecast/ "balancer://mlf-api-processing-api/" 

ProxyPass /statistical-forecast-ws/ "balancer://mlf-forecast-results-processing-api"> 
ProxyPassReverse /statistical-forecast-ws/ "balancer://mlf-forecast-results-processing-api"> 

# end MLF management 

</VirtualHost>