I think this will add more context. I am working with Neural ODEs using the torchdyn library, which is based on torchdiffeq. torchdiffeq recently added support for using SciPy ODE solvers
Here is the complete error log:
/Users/rasalghul/Desktop/OSS/torchdyn/torchdyn/models/neuralde.py:100: UserWarning: CUDA is not available with SciPy solvers.
warnings.warn(UserWarning("CUDA is not available with SciPy solvers."))
-c:14: UserWarning: Anomaly Detection has been enabled. This mode will increase the runtime and should only be enabled for debugging.
lsoda-- warning..internal t (=r1) and h (=r2) are
such that in the machine, t + h = t on the next step
(h = step size). solver will continue anyway
in above, r1 = 0.8615037536311D+00 r2 = 0.5194917220621D-16
lsoda-- warning..internal t (=r1) and h (=r2) are
such that in the machine, t + h = t on the next step
(h = step size). solver will continue anyway
in above, r1 = 0.8615037536311D+00 r2 = 0.5194917220621D-16
lsoda-- warning..internal t (=r1) and h (=r2) are
such that in the machine, t + h = t on the next step
(h = step size). solver will continue anyway
in above, r1 = 0.8615037536311D+00 r2 = 0.1298729305155D-16
lsoda-- warning..internal t (=r1) and h (=r2) are
such that in the machine, t + h = t on the next step
(h = step size). solver will continue anyway
in above, r1 = 0.8615037536311D+00 r2 = 0.1298729305155D-16
lsoda-- warning..internal t (=r1) and h (=r2) are
such that in the machine, t + h = t on the next step
(h = step size). solver will continue anyway
in above, r1 = 0.8615037536311D+00 r2 = 0.3246823262888D-17
lsoda-- warning..internal t (=r1) and h (=r2) are
such that in the machine, t + h = t on the next step
(h = step size). solver will continue anyway
in above, r1 = 0.8615037536311D+00 r2 = 0.8117058157221D-18
lsoda-- warning..internal t (=r1) and h (=r2) are
such that in the machine, t + h = t on the next step
(h = step size). solver will continue anyway
in above, r1 = 0.8615037536311D+00 r2 = 0.8117058157221D-18
lsoda-- warning..internal t (=r1) and h (=r2) are
such that in the machine, t + h = t on the next step
(h = step size). solver will continue anyway
in above, r1 = 0.8615037536311D+00 r2 = 0.8117058157221D-18
lsoda-- warning..internal t (=r1) and h (=r2) are
such that in the machine, t + h = t on the next step
(h = step size). solver will continue anyway
in above, r1 = 0.8615037536311D+00 r2 = 0.1062687637051D-17
lsoda-- warning..internal t (=r1) and h (=r2) are
such that in the machine, t + h = t on the next step
(h = step size). solver will continue anyway
in above, r1 = 0.8615037536311D+00 r2 = 0.2656719092627D-18
lsoda-- above warning has been issued i1 times.
it will not be issued again for this problem
in above message, i1 = 10
lsoda-- warning..internal t (=r1) and h (=r2) are
such that in the machine, t + h = t on the next step
(h = step size). solver will continue anyway
in above, r1 = 0.8615037536311D+00 r2 = 0.5194917220621D-16
lsoda-- warning..internal t (=r1) and h (=r2) are
such that in the machine, t + h = t on the next step
(h = step size). solver will continue anyway
in above, r1 = 0.8615037536311D+00 r2 = 0.5194917220621D-16
lsoda-- warning..internal t (=r1) and h (=r2) are
such that in the machine, t + h = t on the next step
(h = step size). solver will continue anyway
in above, r1 = 0.8615037536311D+00 r2 = 0.1298729305155D-16
lsoda-- warning..internal t (=r1) and h (=r2) are
such that in the machine, t + h = t on the next step
(h = step size). solver will continue anyway
in above, r1 = 0.8615037536311D+00 r2 = 0.1298729305155D-16
lsoda-- warning..internal t (=r1) and h (=r2) are
such that in the machine, t + h = t on the next step
(h = step size). solver will continue anyway
in above, r1 = 0.8615037536311D+00 r2 = 0.3246823262888D-17
lsoda-- warning..internal t (=r1) and h (=r2) are
such that in the machine, t + h = t on the next step
(h = step size). solver will continue anyway
in above, r1 = 0.8615037536311D+00 r2 = 0.8117058157221D-18
lsoda-- warning..internal t (=r1) and h (=r2) are
such that in the machine, t + h = t on the next step
(h = step size). solver will continue anyway
in above, r1 = 0.8615037536311D+00 r2 = 0.8117058157221D-18
lsoda-- warning..internal t (=r1) and h (=r2) are
such that in the machine, t + h = t on the next step
(h = step size). solver will continue anyway
in above, r1 = 0.8615037536311D+00 r2 = 0.8117058157221D-18
lsoda-- warning..internal t (=r1) and h (=r2) are
such that in the machine, t + h = t on the next step
(h = step size). solver will continue anyway
in above, r1 = 0.8615037536311D+00 r2 = 0.1062687637051D-17
lsoda-- warning..internal t (=r1) and h (=r2) are
such that in the machine, t + h = t on the next step
(h = step size). solver will continue anyway
in above, r1 = 0.8615037536311D+00 r2 = 0.2656719092627D-18
lsoda-- above warning has been issued i1 times.
it will not be issued again for this problem
in above message, i1 = 10
lsoda-- warning..internal t (=r1) and h (=r2) are
such that in the machine, t + h = t on the next step
(h = step size). solver will continue anyway
in above, r1 = 0.8615037536311D+00 r2 = 0.5194917220621D-16
lsoda-- warning..internal t (=r1) and h (=r2) are
such that in the machine, t + h = t on the next step
(h = step size). solver will continue anyway
in above, r1 = 0.8615037536311D+00 r2 = 0.5194917220621D-16
lsoda-- warning..internal t (=r1) and h (=r2) are
such that in the machine, t + h = t on the next step
(h = step size). solver will continue anyway
in above, r1 = 0.8615037536311D+00 r2 = 0.1298729305155D-16
lsoda-- warning..internal t (=r1) and h (=r2) are
such that in the machine, t + h = t on the next step
(h = step size). solver will continue anyway
in above, r1 = 0.8615037536311D+00 r2 = 0.1298729305155D-16
lsoda-- warning..internal t (=r1) and h (=r2) are
such that in the machine, t + h = t on the next step
(h = step size). solver will continue anyway
in above, r1 = 0.8615037536311D+00 r2 = 0.3246823262888D-17
lsoda-- warning..internal t (=r1) and h (=r2) are
such that in the machine, t + h = t on the next step
(h = step size). solver will continue anyway
in above, r1 = 0.8615037536311D+00 r2 = 0.8117058157221D-18
lsoda-- warning..internal t (=r1) and h (=r2) are
such that in the machine, t + h = t on the next step
(h = step size). solver will continue anyway
in above, r1 = 0.8615037536311D+00 r2 = 0.8117058157221D-18
lsoda-- warning..internal t (=r1) and h (=r2) are
such that in the machine, t + h = t on the next step
(h = step size). solver will continue anyway
in above, r1 = 0.8615037536311D+00 r2 = 0.8117058157221D-18
lsoda-- warning..internal t (=r1) and h (=r2) are
such that in the machine, t + h = t on the next step
(h = step size). solver will continue anyway
in above, r1 = 0.8615037536311D+00 r2 = 0.1062687637051D-17
lsoda-- warning..internal t (=r1) and h (=r2) are
such that in the machine, t + h = t on the next step
(h = step size). solver will continue anyway
in above, r1 = 0.8615037536311D+00 r2 = 0.2656719092627D-18
lsoda-- above warning has been issued i1 times.
it will not be issued again for this problem
in above message, i1 = 10
lsoda-- warning..internal t (=r1) and h (=r2) are
such that in the machine, t + h = t on the next step
(h = step size). solver will continue anyway
in above, r1 = 0.8615037536311D+00 r2 = 0.5194917220621D-16
lsoda-- warning..internal t (=r1) and h (=r2) are
such that in the machine, t + h = t on the next step
(h = step size). solver will continue anyway
in above, r1 = 0.8615037536311D+00 r2 = 0.5194917220621D-16
lsoda-- warning..internal t (=r1) and h (=r2) are
such that in the machine, t + h = t on the next step
(h = step size). solver will continue anyway
in above, r1 = 0.8615037536311D+00 r2 = 0.1298729305155D-16
lsoda-- warning..internal t (=r1) and h (=r2) are
such that in the machine, t + h = t on the next step
(h = step size). solver will continue anyway
in above, r1 = 0.8615037536311D+00 r2 = 0.1298729305155D-16
lsoda-- warning..internal t (=r1) and h (=r2) are
such that in the machine, t + h = t on the next step
(h = step size). solver will continue anyway
in above, r1 = 0.8615037536311D+00 r2 = 0.3246823262888D-17
lsoda-- warning..internal t (=r1) and h (=r2) are
such that in the machine, t + h = t on the next step
(h = step size). solver will continue anyway
in above, r1 = 0.8615037536311D+00 r2 = 0.8117058157221D-18
lsoda-- warning..internal t (=r1) and h (=r2) are
such that in the machine, t + h = t on the next step
(h = step size). solver will continue anyway
in above, r1 = 0.8615037536311D+00 r2 = 0.8117058157221D-18
lsoda-- warning..internal t (=r1) and h (=r2) are
such that in the machine, t + h = t on the next step
(h = step size). solver will continue anyway
in above, r1 = 0.8615037536311D+00 r2 = 0.8117058157221D-18
lsoda-- warning..internal t (=r1) and h (=r2) are
such that in the machine, t + h = t on the next step
(h = step size). solver will continue anyway
in above, r1 = 0.8615037536311D+00 r2 = 0.1062687637051D-17
lsoda-- warning..internal t (=r1) and h (=r2) are
such that in the machine, t + h = t on the next step
(h = step size). solver will continue anyway
in above, r1 = 0.8615037536311D+00 r2 = 0.2656719092627D-18
lsoda-- above warning has been issued i1 times.
it will not be issued again for this problem
in above message, i1 = 10
lsoda-- warning..internal t (=r1) and h (=r2) are
such that in the machine, t + h = t on the next step
(h = step size). solver will continue anyway
in above, r1 = 0.8615037536311D+00 r2 = 0.5194917220621D-16
lsoda-- warning..internal t (=r1) and h (=r2) are
such that in the machine, t + h = t on the next step
(h = step size). solver will continue anyway
in above, r1 = 0.8615037536311D+00 r2 = 0.5194917220621D-16
lsoda-- warning..internal t (=r1) and h (=r2) are
such that in the machine, t + h = t on the next step
(h = step size). solver will continue anyway
in above, r1 = 0.8615037536311D+00 r2 = 0.1298729305155D-16
lsoda-- warning..internal t (=r1) and h (=r2) are
such that in the machine, t + h = t on the next step
(h = step size). solver will continue anyway
in above, r1 = 0.8615037536311D+00 r2 = 0.1298729305155D-16
lsoda-- warning..internal t (=r1) and h (=r2) are
such that in the machine, t + h = t on the next step
(h = step size). solver will continue anyway
in above, r1 = 0.8615037536311D+00 r2 = 0.3246823262888D-17
lsoda-- warning..internal t (=r1) and h (=r2) are
such that in the machine, t + h = t on the next step
(h = step size). solver will continue anyway
in above, r1 = 0.8615037536311D+00 r2 = 0.8117058157221D-18
lsoda-- warning..internal t (=r1) and h (=r2) are
such that in the machine, t + h = t on the next step
(h = step size). solver will continue anyway
in above, r1 = 0.8615037536311D+00 r2 = 0.8117058157221D-18
lsoda-- warning..internal t (=r1) and h (=r2) are
such that in the machine, t + h = t on the next step
(h = step size). solver will continue anyway
in above, r1 = 0.8615037536311D+00 r2 = 0.8117058157221D-18
lsoda-- warning..internal t (=r1) and h (=r2) are
such that in the machine, t + h = t on the next step
(h = step size). solver will continue anyway
in above, r1 = 0.8615037536311D+00 r2 = 0.1062687637051D-17
lsoda-- warning..internal t (=r1) and h (=r2) are
such that in the machine, t + h = t on the next step
(h = step size). solver will continue anyway
in above, r1 = 0.8615037536311D+00 r2 = 0.2656719092627D-18
lsoda-- above warning has been issued i1 times.
it will not be issued again for this problem
in above message, i1 = 10
lsoda-- at t (=r1) and step size h (=r2), the
corrector convergence failed repeatedly
or with abs(h) = hmin
in above, r1 = 0.8881958337303D+00 r2 = 0.7908523116782D-36
/Users/rasalghul/anaconda3/envs/Juniper/lib/python3.7/site-packages/scipy/integrate/_ode.py:1351: UserWarning: lsoda: Repeated convergence failures (perhaps bad Jacobian or tolerances).
self.messages.get(istate, unexpected_istate_msg)))
capi_return is NULL
Call-back cb_f_in_lsoda__user__routines failed.
[W python_anomaly_mode.cpp:60] Warning: Error detected in AddmmBackward. Traceback of forward call that caused the error:
File "<string>", line 1, in <module>
File "/Users/rasalghul/anaconda3/envs/Juniper/lib/python3.7/site-packages/traitlets/config/application.py", line 664, in launch_instance
app.start()
File "/Users/rasalghul/anaconda3/envs/Juniper/lib/python3.7/site-packages/IPython/terminal/ipapp.py", line 356, in start
self.shell.mainloop()
File "/Users/rasalghul/anaconda3/envs/Juniper/lib/python3.7/site-packages/IPython/terminal/interactiveshell.py", line 564, in mainloop
self.interact()
File "/Users/rasalghul/anaconda3/envs/Juniper/lib/python3.7/site-packages/IPython/terminal/interactiveshell.py", line 555, in interact
self.run_cell(code, store_history=True)
File "/Users/rasalghul/anaconda3/envs/Juniper/lib/python3.7/site-packages/IPython/core/interactiveshell.py", line 2877, in run_cell
raw_cell, store_history, silent, shell_futures)
File "/Users/rasalghul/anaconda3/envs/Juniper/lib/python3.7/site-packages/IPython/core/interactiveshell.py", line 2922, in _run_cell
return runner(coro)
File "/Users/rasalghul/anaconda3/envs/Juniper/lib/python3.7/site-packages/IPython/core/async_helpers.py", line 68, in pseudo_sync_runner
coro.send(None)
File "/Users/rasalghul/anaconda3/envs/Juniper/lib/python3.7/site-packages/IPython/core/interactiveshell.py", line 3146, in run_cell_async
interactivity=interactivity, compiler=compiler, result=result)
File "/Users/rasalghul/anaconda3/envs/Juniper/lib/python3.7/site-packages/IPython/core/interactiveshell.py", line 3337, in run_ast_nodes
if (await self.run_code(code, result, async=asy)):
File "/Users/rasalghul/anaconda3/envs/Juniper/lib/python3.7/site-packages/IPython/core/interactiveshell.py", line 3417, in run_code
exec(code_obj, self.user_global_ns, self.user_ns)
File "<ipython-input-3-06ac8d953a44>", line 17, in <module>
loss.backward(retain_graph=False)
File "/Users/rasalghul/anaconda3/envs/Juniper/lib/python3.7/site-packages/torch/tensor.py", line 185, in backward
torch.autograd.backward(self, gradient, retain_graph, create_graph)
File "/Users/rasalghul/anaconda3/envs/Juniper/lib/python3.7/site-packages/torch/autograd/init.py", line 127, in backward
allow_unreachable=True) # allow_unreachable flag
File "/Users/rasalghul/anaconda3/envs/Juniper/lib/python3.7/site-packages/torch/autograd/function.py", line 78, in apply
return self._forward_cls.backward(self, *args)
File "/Users/rasalghul/Desktop/OSS/torchdyn/torchdyn/sensitivity/adjoint.py", line 208, in backward
rtol=rtol, atol=atol, method=method, options=options)
File "/Users/rasalghul/Desktop/OSS/torchdiffeq/torchdiffeq/_impl/odeint.py", line 67, in odeint
solution = solver.integrate(t)
File "/Users/rasalghul/Desktop/OSS/torchdiffeq/torchdiffeq/_impl/scipy_wrapper.py", line 36, in integrate
atol=self.atol,
File "/Users/rasalghul/anaconda3/envs/Juniper/lib/python3.7/site-packages/scipy/integrate/_ivp/ivp.py", line 576, in solve_ivp
message = solver.step()
File "/Users/rasalghul/anaconda3/envs/Juniper/lib/python3.7/site-packages/scipy/integrate/_ivp/base.py", line 181, in step
success, message = self._step_impl()
File "/Users/rasalghul/anaconda3/envs/Juniper/lib/python3.7/site-packages/scipy/integrate/_ivp/lsoda.py", line 150, in _step_impl
self.t_bound, solver.f_params, solver.jac_params)
File "/Users/rasalghul/anaconda3/envs/Juniper/lib/python3.7/site-packages/scipy/integrate/_ode.py", line 1346, in run
y1, t, istate = self.runner(*args)
File "/Users/rasalghul/anaconda3/envs/Juniper/lib/python3.7/site-packages/scipy/integrate/_ivp/base.py", line 138, in fun
return self.fun_single(t, y)
File "/Users/rasalghul/anaconda3/envs/Juniper/lib/python3.7/site-packages/scipy/integrate/_ivp/base.py", line 20, in fun_wrapped
return np.asarray(fun(t, y), dtype=dtype)
File "/Users/rasalghul/Desktop/OSS/torchdiffeq/torchdiffeq/_impl/scipy_wrapper.py", line 49, in np_func
f = func(t, y)
File "/Users/rasalghul/anaconda3/envs/Juniper/lib/python3.7/site-packages/torch/nn/modules/module.py", line 722, in _call_impl
result = self.forward(*input, **kwargs)
File "/Users/rasalghul/Desktop/OSS/torchdiffeq/torchdiffeq/_impl/misc.py", line 163, in forward
return -self.base_func(-t, y)
File "/Users/rasalghul/anaconda3/envs/Juniper/lib/python3.7/site-packages/torch/nn/modules/module.py", line 722, in _call_impl
result = self.forward(*input, **kwargs)
File "/Users/rasalghul/Desktop/OSS/torchdiffeq/torchdiffeq/_impl/misc.py", line 153, in forward
f = self.base_func(t, _flat_to_shape(y, (), self.shapes))
File "/Users/rasalghul/Desktop/OSS/torchdyn/torchdyn/sensitivity/adjoint.py", line 167, in solve_backward
dzds = self.f(s, z)
File "/Users/rasalghul/anaconda3/envs/Juniper/lib/python3.7/site-packages/torch/nn/modules/module.py", line 722, in _call_impl
result = self.forward(*input, **kwargs)
File "/Users/rasalghul/Desktop/OSS/torchdyn/torchdyn/models/defunc.py", line 51, in forward
else: x = self.m(x)
File "/Users/rasalghul/anaconda3/envs/Juniper/lib/python3.7/site-packages/torch/nn/modules/module.py", line 722, in _call_impl
result = self.forward(*input, **kwargs)
File "<ipython-input-1-16a4f604f5d6>", line 743, in forward
self.kernel_x = self.kernel(x)
File "/Users/rasalghul/anaconda3/envs/Juniper/lib/python3.7/site-packages/torch/nn/modules/module.py", line 722, in _call_impl
result = self.forward(*input, **kwargs)
File "/Users/rasalghul/anaconda3/envs/Juniper/lib/python3.7/site-packages/torch/nn/modules/container.py", line 117, in forward
input = module(input)
File "/Users/rasalghul/anaconda3/envs/Juniper/lib/python3.7/site-packages/torch/nn/modules/module.py", line 722, in _call_impl
result = self.forward(*input, **kwargs)
File "/Users/rasalghul/anaconda3/envs/Juniper/lib/python3.7/site-packages/torch/nn/modules/linear.py", line 91, in forward
return F.linear(input, self.weight, self.bias)
File "/Users/rasalghul/anaconda3/envs/Juniper/lib/python3.7/site-packages/torch/nn/functional.py", line 1674, in linear
ret = torch.addmm(bias, input, weight.t())
(function print_stack)
[W python_anomaly_mode.cpp:60] Warning: Error detected in autograd_adjointBackward. Traceback of forward call that caused the error:
File "<string>", line 1, in <module>
File "/Users/rasalghul/anaconda3/envs/Juniper/lib/python3.7/site-packages/traitlets/config/application.py", line 664, in launch_instance
app.start()
File "/Users/rasalghul/anaconda3/envs/Juniper/lib/python3.7/site-packages/IPython/terminal/ipapp.py", line 356, in start
self.shell.mainloop()
File "/Users/rasalghul/anaconda3/envs/Juniper/lib/python3.7/site-packages/IPython/terminal/interactiveshell.py", line 564, in mainloop
self.interact()
File "/Users/rasalghul/anaconda3/envs/Juniper/lib/python3.7/site-packages/IPython/terminal/interactiveshell.py", line 555, in interact
self.run_cell(code, store_history=True)
File "/Users/rasalghul/anaconda3/envs/Juniper/lib/python3.7/site-packages/IPython/core/interactiveshell.py", line 2877, in run_cell
raw_cell, store_history, silent, shell_futures)
File "/Users/rasalghul/anaconda3/envs/Juniper/lib/python3.7/site-packages/IPython/core/interactiveshell.py", line 2922, in _run_cell
return runner(coro)
File "/Users/rasalghul/anaconda3/envs/Juniper/lib/python3.7/site-packages/IPython/core/async_helpers.py", line 68, in pseudo_sync_runner
coro.send(None)
File "/Users/rasalghul/anaconda3/envs/Juniper/lib/python3.7/site-packages/IPython/core/interactiveshell.py", line 3146, in run_cell_async
interactivity=interactivity, compiler=compiler, result=result)
File "/Users/rasalghul/anaconda3/envs/Juniper/lib/python3.7/site-packages/IPython/core/interactiveshell.py", line 3337, in run_ast_nodes
if (await self.run_code(code, result, async=asy)):
File "/Users/rasalghul/anaconda3/envs/Juniper/lib/python3.7/site-packages/IPython/core/interactiveshell.py", line 3417, in run_code
exec(code_obj, self.user_global_ns, self.user_ns)
File "<ipython-input-3-06ac8d953a44>", line 15, in <module>
out=net(batch[0])
File "/Users/rasalghul/anaconda3/envs/Juniper/lib/python3.7/site-packages/torch/nn/modules/module.py", line 722, in _call_impl
result = self.forward(*input, **kwargs)
File "<ipython-input-1-16a4f604f5d6>", line 911, in forward
activity_cur = self.activity_NODE(in_NODE)
File "/Users/rasalghul/anaconda3/envs/Juniper/lib/python3.7/site-packages/torch/nn/modules/module.py", line 722, in _call_impl
result = self.forward(*input, **kwargs)
File "<ipython-input-1-16a4f604f5d6>", line 799, in forward
y = self.neural_de(x)
File "/Users/rasalghul/anaconda3/envs/Juniper/lib/python3.7/site-packages/torch/nn/modules/module.py", line 722, in _call_impl
result = self.forward(*input, **kwargs)
File "/Users/rasalghul/Desktop/OSS/torchdyn/torchdyn/models/neuralde.py", line 139, in forward
out = odeint(x)
File "/Users/rasalghul/Desktop/OSS/torchdyn/torchdyn/models/neuralde.py", line 165, in _adjoint
return self.adjoint(self.defunc, x, self.s_span, rtol=self.rtol, atol=self.atol, **self.solver)
File "/Users/rasalghul/anaconda3/envs/Juniper/lib/python3.7/site-packages/torch/nn/modules/module.py", line 722, in _call_impl
result = self.forward(*input, **kwargs)
File "/Users/rasalghul/Desktop/OSS/torchdyn/torchdyn/sensitivity/adjoint.py", line 223, in forward
sol = self._wrapped_adjoint_func.apply(h0, flat_params, s_span)
(function print_stack)
---------------------------------------------------------------------------
RuntimeError Traceback (most recent call last)
<ipython-input-3-06ac8d953a44> in <module>
15 out=net(batch[0])
16 loss = nn.MSELoss()(out, batch[1])
---> 17 loss.backward(retain_graph=False)
18 print(i)
19
~/anaconda3/envs/Juniper/lib/python3.7/site-packages/torch/tensor.py in backward(self, gradient, retain_graph, create_graph)
183 products. Defaults to False.
184 """
--> 185 torch.autograd.backward(self, gradient, retain_graph, create_graph)
186
187 def register_hook(self, hook):
~/anaconda3/envs/Juniper/lib/python3.7/site-packages/torch/autograd/init.py in backward(tensors, grad_tensors, retain_graph, create_graph, grad_variables)
125 Variable._execution_engine.run_backward(
126 tensors, grad_tensors, retain_graph, create_graph,
--> 127 allow_unreachable=True) # allow_unreachable flag
128
129
RuntimeError: Function 'AddmmBackward' returned nan values in its 2th output.