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Common Errors in PyTorch and How to Fix Them

This series of tutorials helps you get through common errors that you may encounter when working with PyTorch.

1 How to Resolve "RuntimeError: CUDA out of memory" in PyTorch

2 Dealing with "UserWarning: The given NumPy array is not writable" in PyTorch

3 Addressing "RuntimeError: Expected object of scalar type Float but got Double" in PyTorch

4 Fixing "IndexError: index out of range in self" in PyTorch

5 PyTorch - Overcoming "RuntimeError: cuDNN error: CUDNN_STATUS_EXECUTION_FAILED"

6 PyTorch - Understanding "UserWarning: Using a target size that is different to the input size"

7 PyTorch - Troubleshooting " RuntimeError: Given groups=1, weight of size ... not divisible by groups"

8 Solving "RuntimeError: One of the differentiated Tensors does not require grad" in PyTorch

9 PyTorch - UserWarning Detected call of `lr_scheduler.step()` before `optimizer.step()` - call optimizer.step() before lr_scheduler.step()`

10 Handling "RuntimeError: Trying to backward through the graph a second time" in PyTorch

11 Interpreting "DataLoader worker (pid(s) ...) exited unexpectedly" in PyTorch

12 Resolving "RuntimeError: size mismatch" in PyTorch linear layers

13 Fixing "RuntimeError: CUDA error: invalid device function" in PyTorch GPU Kernels

14 Addressing "UserWarning: To copy construct from a tensor, it is recommended to use `tensor.clone().detach()`" in PyTorch

15 Eliminating "RuntimeError: cudnn RNN backward can only be called in training mode" in PyTorch RNNs

16 Working Around "DeprecationWarning: 'torch.float64' is deprecated" in PyTorch Codebases

17 Preventing "RuntimeError: Gradient tensor is not of the same shape as output tensor" in PyTorch Backprop

18 Dealing with "RuntimeError: expected scalar type Long but found Float" in PyTorch Indexing Operations

19 Solving "UserWarning: nn.functional.sigmoid is deprecated" in PyTorch Activations

20 Handling "RuntimeError: The size of tensor a (X) must match the size of tensor b (Y) at non-singleton dimension" in PyTorch Operations

21 Understanding "UserWarning: The operator 'aten::...' is not currently supported on the target backend" in PyTorch JIT Compilation

22 Overcoming "RuntimeError: cudnn RNN backward: no valid convolution algorithm found in CuDNN" in PyTorch Recurrent Networks

23 Fixing "UserWarning: Named tensors and all their associated APIs are an experimental feature" in PyTorch Tensor Operations

24 Resolving "RuntimeError: No grad accumulator for a saved leaf!" in PyTorch Gradient Calculations

25 Addressing "UserWarning: CUDA initialization: Found no NVIDIA driver on your system" in PyTorch GPU Setup

26 Troubleshooting "RuntimeError: Input type (torch.cuda.FloatTensor) and weight type (torch.FloatTensor) should be the same" in PyTorch

27 Dealing with "UserWarning: torch.nn.utils.clip_grad_norm is now deprecated" in PyTorch Gradient Clipping

28 Solving "RuntimeError: Error(s) in loading state_dict for Model" in PyTorch Model Checkpoints

29 Avoiding "UserWarning: Using a non-full backward hook on a non-leaf tensor is deprecated" in PyTorch Hooks

30 Fixing "RuntimeError: Trying to differentiate twice through the same graph" in PyTorch Backpropagation

31 Preventing "UserWarning: Was asked to gather along dimension 0, but all input tensors were scalars" in PyTorch Data Parallel

32 Handling "RuntimeError: invalid argument 0: Sizes of tensors must match except in dimension 0" in PyTorch Tensor Concatenation

33 Interpreting "UserWarning: Detected discrepancy between CPU and GPU implementations of operator" in PyTorch

34 Resolving "RuntimeError: subgradients at zero points are not well-defined" in PyTorch Optimizers

35 Working Around "UserWarning: PyTorch is using a deprecated CUDA interface" in PyTorch GPU Integration

36 Eliminating "RuntimeError: bool value of Tensor with more than one value is ambiguous" in PyTorch Conditionals

37 Addressing "UserWarning: floor_divide is deprecated, and will be removed in a future version" in PyTorch Tensor Arithmetic

38 Troubleshooting "RuntimeError: mat1 dim 1 must match mat2 dim 0" in PyTorch Matrix Multiplications

39 Dealing with "UserWarning: RNN module weights are not part of single contiguous chunk of memory" in PyTorch Recurrent Layers

40 Solving "RuntimeError: CUDA error: misaligned address" in PyTorch GPU Operations

41 Avoiding "UserWarning: Using a target size that is different from input size is deprecated" in PyTorch Loss Functions

42 Fixing "RuntimeError: CUDA error: an illegal memory access was encountered" in PyTorch Kernels

43 Preventing "UserWarning: To copy construct from a tensor, it is recommended to use `clone()`" in PyTorch Tensor Operations

44 Handling "RuntimeError: index out of range: Tried to access index X out of table with X rows" in PyTorch Embeddings

45 Resolving "UserWarning: Casting complex values to real discards the imaginary part" in PyTorch Complex Operations

46 Working Around "RuntimeError: Inconsistent tensor size" in PyTorch Tensor Transformations

47 Eliminating "RuntimeError: cuDNN error: CUDNN_STATUS_INTERNAL_ERROR" in PyTorch Training Sessions

48 Addressing "UserWarning: Using UTF-8 Locale on Windows" in PyTorch Logging

49 Troubleshooting "RuntimeError: cuda runtime error (59) : device-side assert triggered" in PyTorch GPU Code

50 Dealing with "UserWarning: volatile was removed and now has no effect" in PyTorch Variable Handling

51 Solving "RuntimeError: Error in Scatter/Gather kernel" in PyTorch Distributed Training

52 Avoiding "UserWarning: An unexpected prefix is detected: ... This pattern may lead to errors" in PyTorch Checkpoint Loading

53 Fixing "RuntimeError: one of the variables needed for gradient computation has been modified by an inplace operation" in PyTorch

54 Preventing "UserWarning: Something is off with your code or model, double-check shape assignments" in PyTorch Debugging

55 Handling "RuntimeError: The expanded size of the tensor (X) must match the existing size (Y) at non-singleton dimension" in PyTorch Broadcast

56 Resolving "UserWarning: Converting a tensor to a Python boolean might cause unintended behavior" in PyTorch Condition Checks

57 Working Around "RuntimeError: cuBLAS runtime error : resource allocation failed" in PyTorch GPU Operations

58 Eliminating "RuntimeError: Too many open files" in PyTorch DataLoader

59 Addressing "UserWarning: Using a target size that is different to the input size is deprecated and will result in an error" in PyTorch

60 Troubleshooting "RuntimeError: cudnn RNN backward: at least one of input sizes should be divisible by ... " in PyTorch RNN Layers

61 Dealing with "UserWarning: Detected overlapping indices in index_add" in PyTorch Tensor Updates

62 Solving "RuntimeError: DataLoader worker is killed by signal" in PyTorch Multiprocessing

63 Avoiding "UserWarning: Detected call of `lr_scheduler.step()` after `optimizer.step()`" in PyTorch Scheduler Calls

64 Fixing "RuntimeError: Probability tensor contains either NaN, Inf or element < 0 or > 1" in PyTorch Sampling

65 Preventing "UserWarning: Named Tensors are experimental and subject to change" in PyTorch Tensor APIs

66 Handling "RuntimeError: Sizes of tensors must match except in dimension 2" in PyTorch Concatenate Operations

67 Resolving "UserWarning: Non-finite values detected in gradient" in PyTorch Optimizers

68 Working Around "RuntimeError: cudnn RNN forward: no algorithm worked!" in PyTorch Recurrent Networks

69 Eliminating "RuntimeError: Expected all tensors to be on the same device" in PyTorch Multi-GPU Training

70 Addressing "UserWarning: Creating a tensor from a list of numpy.float64 is deprecated" in PyTorch Tensor Initialization

71 Troubleshooting "RuntimeError: weight should not contain inf or nan" in PyTorch Parameters

72 Dealing with "UserWarning: The detected CUDA version mismatches the one used to compile PyTorch" in PyTorch CUDA Setup

73 Solving "RuntimeError: result type Long can't be cast to the desired output type" in PyTorch Casting

74 Avoiding "UserWarning: torch.distributed is not initialized" in PyTorch Distributed Training

75 Fixing "RuntimeError: Tried to access weight at index X but maximum allowed is Y" in PyTorch Module Weights

76 Preventing "UserWarning: The operator 'aten::...' is not supported in mobile runtimes" in PyTorch Mobile Deployment

77 Handling "RuntimeError: Found dtype ... but expected ... for argument ... at position ..." in PyTorch Type Enforcement

78 Resolving "UserWarning: The value of the 'lr' parameter is zero or negative" in PyTorch Optimizer Configuration

79 Working Around "RuntimeError: CUDA error: no kernel image is available for execution on the device" in PyTorch GPU Compatibility

80 Eliminating "RuntimeError: Attempting to deserialize object on CUDA device X but torch.cuda.is_available() is False" in PyTorch Checkpoint Loading

81 Addressing "UserWarning: None of the inputs have requires_grad=True" in PyTorch Training Loops

82 Troubleshooting "RuntimeError: Trying to backward through the graph a second time, but the saved intermediate results have already been freed" in PyTorch

83 Dealing with "UserWarning: size_average and reduce args will be deprecated, please use reduction='mean'" in PyTorch Loss Functions

84 Solving "RuntimeError: The size of tensor a (X) must match the size of tensor b (Y) in PyTorch Binary Operations"

85 Avoiding "UserWarning: Metrics should be computed on the CPU to avoid OOM issues" in PyTorch Model Evaluation

86 Fixing "RuntimeError: Unable to find a valid cuDNN algorithm to run convolution" in PyTorch CNNs