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View Code? Open in Web Editor NEWPyTorch Implementation of Online Training of Spiking Recurrent Neural Networks with Phase-Change Memory Synapses
License: MIT License
PyTorch Implementation of Online Training of Spiking Recurrent Neural Networks with Phase-Change Memory Synapses
License: MIT License
We noticed a minor bug in the initial version of the 'xbar.reset()` function. This bug is an implementation error, and the paper results are obtained using this old version of the function.
Specifically, the bug causes the device to prevent reinitialization of the programming time variable,tp
, to the time of application of the RESET pulse and instead reinitialises tp
to 0.
This bug is not so critical because, during e-prop training experiments, we always SET the PCM device just after applying a RESET pulse, which has been updating (hence correcting) the tp
variable.
Old version (used in the paper)
def reset(self, mask, G0=0.1):
self.Pmem[mask] = 1
self.tp[mask] = 0
self.count[mask] = 0
self.G[mask] = torch.normal(G0, G0 * 0.1, ((torch.sum(mask),)), device=self.device).clamp(1e-2, self.Gmax)
self.tracker[mask[:,0,:,:]] = 0
Corrected version
def reset(self, tp, mask, G0=0.1):
''' Emulates a masked RESET operation on the PCM crossbar.
Args:
mask : Mask for selecting PCM device
G0 : Initial conductance value
'''
self.Pmem[mask] = 1
self.tp[mask] = tp # Please read Issue #1 for more details regarding the change in this line for replication of the results.
self.count[mask] = 0
self.G[mask] = torch.normal(G0, G0 * 0.1, ((torch.sum(mask),)), device=self.device).clamp(1e-2, self.Gmax)
self.tracker[mask[:,0,:,:]] = 0
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