Details
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Type:
Sub-task
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Status: Open
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Priority:
Major
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Resolution: Unresolved
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Affects Version/s: None
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Fix Version/s: None
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Component/s: None
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Labels:None
Description
This part aims to implement the parameter server for spark distributed backend. In general, we could launch a parameter server in a host to provide the pull and push service. For the moment, all the weights and biases are saved in a hashmap using a key, e.g., "global parameter". Each worker's gradients will be put into the hashmap seperately with a given key. And the exchange between server and workers will be implemented by netty RPC. Hence, we could easily broadcast the IP address and the port number to the workers. And then the workers can send the gradients and retrieve the new parameters via netty RPC. The server will also spawn a thread which retrieves the gradients by polling the hashmap using relevant keys and aggregates them. At last, it updates the global parameter in the hashmap.