mirror of https://github.com/hpcaitech/ColossalAI
92 lines
3.4 KiB
Python
92 lines
3.4 KiB
Python
import torch.nn
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from colossalai.gemini.memory_tracer import MemStats
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from colossalai.gemini.ophooks.runtime_mem_tracer_hook import GradMemStats, GradMemTracerHook, ParamMemTracerHook
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from colossalai.nn.parallel.data_parallel import _cast_float
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from colossalai.tensor.param_op_hook import ColoParamOpHookManager
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__all__ = ['RuntimeMemTracer']
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class RuntimeMemTracer():
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"""RuntimeMemTracer for the module training using ColoParameter.
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Trace non-model memory usage during fwd+bwd process.
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It is obtained by using a tensor with the same shape as the training process as the inputs
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and running an single fwd+bwd to trace the statistics.
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NOTE()
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1. The premise to use this tracer is that the target DNN execute the same operations at each iterations,
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2. Module buffers are viewed as non-model data.
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"""
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def __init__(self, module: torch.nn.Module, dtype: torch.dtype = torch.half):
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super().__init__()
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self.module = module
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self.dtype = dtype
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self._gradstat = GradMemStats()
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self._memstats = MemStats()
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self.param_op_hook = ParamMemTracerHook(self._memstats, self._gradstat)
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self.grad_hook = GradMemTracerHook(self._gradstat)
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self.cpu_param_data_dict = {}
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for p in module.parameters():
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p.data = p.data.to(dtype)
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self._cast_buffers_to_cuda_dtype()
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def __call__(self, *args, **kwargs):
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return self.forward(*args, **kwargs)
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def _backup_params(self):
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"""
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The function is called before forward. Backup model params on cpu.
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"""
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for p in self.module.parameters():
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self.cpu_param_data_dict[p] = torch.empty(p.data.shape, dtype=self.dtype, device="cpu")
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self.cpu_param_data_dict[p].copy_(p.data)
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def _restore_params(self):
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"""
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This function is called after backward. Restore model params.
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"""
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for p in self.module.parameters():
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p.data = torch.empty(p.data.shape, dtype=self.dtype, device="cpu", requires_grad=p.data.requires_grad)
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p.data.copy_(self.cpu_param_data_dict[p])
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self.cpu_param_data_dict.clear()
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def _pre_forward(self):
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self._clear_cuda_mem_info()
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self._backup_params()
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self.grad_hook.register_grad_hook(self.module)
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self.param_op_hook.mem_monitor.start()
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def forward(self, *args, **kwargs):
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args, kwargs = _cast_float(args, self.dtype), _cast_float(kwargs, self.dtype)
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self.module.zero_grad(set_to_none=True)
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self._pre_forward()
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with ColoParamOpHookManager.use_hooks(self.param_op_hook):
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outputs = self.module(*args, **kwargs)
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return outputs
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def backward(self, loss):
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with self.param_op_hook.switch_to_backward(), ColoParamOpHookManager.use_hooks(self.param_op_hook):
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loss.backward()
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self._post_backward()
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def _post_backward(self):
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cuda_volume = self.param_op_hook.mem_monitor.finish()
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self._memstats.append_non_model_data('cuda', cuda_volume - self._memstats.last_model_data('cuda'))
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self.grad_hook.remove_grad_hook()
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self._restore_params()
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def _clear_cuda_mem_info(self):
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self._memstats.clear()
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self._gradstat.clear()
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def _cast_buffers_to_cuda_dtype(self):
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for buffer in self.module.buffers():
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buffer.data = buffer.cuda()
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if torch.is_floating_point(buffer):
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buffer.data = buffer.data.to(self.dtype)
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