Why Each Step of Recurrent Network Has Its Own Workspace? C++

C++
1

Hi,

I am reading caffe2 c++ codes: operators/rnn/recurrent_network_op.h.
In RecurrentNetworkOp::DoRunWIthType, the Op created a collection of workspaces, one for each t. Why each time step needs unique workspace? Seemed the hidden_state and cell_state and other recurrent states (both forward pass and backward pass) have been assigned enough storage for states of all the time steps?

Thank you very much!

2

Maybe for parallel execution and storage of output of internal operator of each step.