Running in colab

[mosheliv]

Hi,

I am trying to write a colab notebook that will solve puzzles easily for people with no GPU. This is where I got to so far: https://colab.research.google.com/drive/17SQJoHHT36t8fPOam-Kun35mNH4LoxSa?usp=sharing

I have passed many hurdles but now stuck on something I don't understand. it fails with:

    234 
    235                 query_vectors.extend(out.cpu().split(1, dim=0))
--> 236         query_tensor = torch.cat(query_vectors, dim=0)
    237         assert query_tensor.size(0) == len(questions)
    238         return query_tensor

NotImplementedError: There were no tensor arguments to this function (e.g., you passed an empty list of Tensors), but no fallback function is registered for schema aten::_cat.  This usually means that this function requires a non-empty list of Tensors, or that you (the operator writer) forgot to register a fallback function.  Available functions are [CPU, CUDA, QuantizedCPU, BackendSelect, Python, Named, Conjugate, Negative, ZeroTensor, ADInplaceOrView, AutogradOther, AutogradCPU, AutogradCUDA, AutogradXLA, AutogradLazy, AutogradXPU, AutogradMLC, AutogradHPU, AutogradNestedTensor, AutogradPrivateUse1, AutogradPrivateUse2, AutogradPrivateUse3, Tracer, AutocastCPU, Autocast, Batched, VmapMode, Functionalize].

CPU: registered at aten/src/ATen/RegisterCPU.cpp:21063 [kernel]
CUDA: registered at aten/src/ATen/RegisterCUDA.cpp:29726 [kernel]
QuantizedCPU: registered at aten/src/ATen/RegisterQuantizedCPU.cpp:1258 [kernel]
BackendSelect: fallthrough registered at ../aten/src/ATen/core/BackendSelectFallbackKernel.cpp:3 [backend fallback]
Python: registered at ../aten/src/ATen/core/PythonFallbackKernel.cpp:47 [backend fallback]
Named: registered at ../aten/src/ATen/core/NamedRegistrations.cpp:7 [backend fallback]
Conjugate: registered at ../aten/src/ATen/ConjugateFallback.cpp:18 [backend fallback]
Negative: registered at ../aten/src/ATen/native/NegateFallback.cpp:18 [backend fallback]
ZeroTensor: registered at ../aten/src/ATen/ZeroTensorFallback.cpp:86 [backend fallback]
ADInplaceOrView: fallthrough registered at ../aten/src/ATen/core/VariableFallbackKernel.cpp:64 [backend fallback]
AutogradOther: registered at ../torch/csrc/autograd/generated/VariableType_3.cpp:11380 [autograd kernel]
AutogradCPU: registered at ../torch/csrc/autograd/generated/VariableType_3.cpp:11380 [autograd kernel]
AutogradCUDA: registered at ../torch/csrc/autograd/generated/VariableType_3.cpp:11380 [autograd kernel]
AutogradXLA: registered at ../torch/csrc/autograd/generated/VariableType_3.cpp:11380 [autograd kernel]
AutogradLazy: registered at ../torch/csrc/autograd/generated/VariableType_3.cpp:11380 [autograd kernel]
AutogradXPU: registered at ../torch/csrc/autograd/generated/VariableType_3.cpp:11380 [autograd kernel]
AutogradMLC: registered at ../torch/csrc/autograd/generated/VariableType_3.cpp:11380 [autograd kernel]
AutogradHPU: registered at ../torch/csrc/autograd/generated/VariableType_3.cpp:11380 [autograd kernel]
AutogradNestedTensor: registered at ../torch/csrc/autograd/generated/VariableType_3.cpp:11380 [autograd kernel]
AutogradPrivateUse1: registered at ../torch/csrc/autograd/generated/VariableType_3.cpp:11380 [autograd kernel]
AutogradPrivateUse2: registered at ../torch/csrc/autograd/generated/VariableType_3.cpp:11380 [autograd kernel]
AutogradPrivateUse3: registered at ../torch/csrc/autograd/generated/VariableType_3.cpp:11380 [autograd kernel]
Tracer: registered at ../torch/csrc/autograd/generated/TraceType_3.cpp:11220 [kernel]
AutocastCPU: fallthrough registered at ../aten/src/ATen/autocast_mode.cpp:461 [backend fallback]
Autocast: fallthrough registered at ../aten/src/ATen/autocast_mode.cpp:305 [backend fallback]
Batched: registered at ../aten/src/ATen/BatchingRegistrations.cpp:1059 [backend fallback]
VmapMode: fallthrough registered at ../aten/src/ATen/VmapModeRegistrations.cpp:33 [backend fallback]
Functionalize: registered at ../aten/src/ATen/FunctionalizeFallbackKernel.cpp:52 [backend fallback]