Hello,
I’ve found the issue that cannot understand.
In the TorchScript doc said that we can use ModuleList as long as they are constant. It is possible to iterate over it, but cannot get the length of ModuleList
class SubModule(torch.nn.Module):
def __init__(self):
super(SubModule, self).__init__()
self.weight = nn.Parameter(torch.randn(2))
def forward(self, input):
return self.weight + input
class MyModule(torch.nn.Module):
__constants__ = ['mods']
def __init__(self, x):
super(MyModule, self).__init__()
self.mods = torch.nn.ModuleList([SubModule() for i in range(10)])
def forward(self, v):
print(len(self.mods))
return v
m = torch.jit.script(MyModule(3))
m(torch.rand(3))
Gives an error:
~/anaconda2/envs/pytorch-nightly/lib/python3.7/site-packages/torch/jit/_recursive.py in create_methods_from_stubs(concrete_type, stubs)
278 rcbs = [m.resolution_callback for m in stubs]
279 defaults = [get_default_args(m.original_method) for m in stubs]
--> 280 concrete_type._create_methods(defs, rcbs, defaults)
281
282 def create_script_module_for_tracing(nn_module, stubs):
RuntimeError:
Tried to access nonexistent attribute or method '__len__' of type '__torch__.torch.jit.___torch_mangle_65._ConstModuleList'. Did you forget to initialize an attribute in __init__()?:
at <ipython-input-26-4c61e0830c6c>:17:14
def forward(self, v):
print(len(self.mods))
~~~ <--- HERE
return v