I just got this message when trying to run a feed forward torch.nn.Conv2d, getting the following stacktrace:
---------------------------------------------------------------------------
RuntimeError                              Traceback (most recent call last)
<ipython-input-26-04bd4a00565d> in <module>
      3 
      4 # call training function
----> 5 losses = train(D, G, n_epochs=n_epochs)

<ipython-input-24-b539315e0aa0> in train(D, G, n_epochs, print_every)
     46                 real_images = real_images.cuda()
     47 
---> 48             D_real = D(real_images)
     49             d_real_loss = real_loss(D_real, True) # smoothing label 1 => 0.9
     50 

~/anaconda3/lib/python3.7/site-packages/torch/nn/modules/module.py in __call__(self, *input, **kwargs)
    548             result = self._slow_forward(*input, **kwargs)
    549         else:
--> 550             result = self.forward(*input, **kwargs)
    551         for hook in self._forward_hooks.values():
    552             hook_result = hook(self, input, result)

<ipython-input-14-bf68e57c25ff> in forward(self, x)
     48         """
     49 
---> 50         x = self.leaky_relu(self.conv1(x))
     51         x = self.leaky_relu(self.conv2(x))
     52         x = self.leaky_relu(self.conv3(x))

~/anaconda3/lib/python3.7/site-packages/torch/nn/modules/module.py in __call__(self, *input, **kwargs)
    548             result = self._slow_forward(*input, **kwargs)
    549         else:
--> 550             result = self.forward(*input, **kwargs)
    551         for hook in self._forward_hooks.values():
    552             hook_result = hook(self, input, result)

~/anaconda3/lib/python3.7/site-packages/torch/nn/modules/container.py in forward(self, input)
     98     def forward(self, input):
     99         for module in self:
--> 100             input = module(input)
    101         return input
    102 

~/anaconda3/lib/python3.7/site-packages/torch/nn/modules/module.py in __call__(self, *input, **kwargs)
    548             result = self._slow_forward(*input, **kwargs)
    549         else:
--> 550             result = self.forward(*input, **kwargs)
    551         for hook in self._forward_hooks.values():
    552             hook_result = hook(self, input, result)

~/anaconda3/lib/python3.7/site-packages/torch/nn/modules/conv.py in forward(self, input)
    347 
    348     def forward(self, input):
--> 349         return self._conv_forward(input, self.weight)
    350 
    351 class Conv3d(_ConvNd):

~/anaconda3/lib/python3.7/site-packages/torch/nn/modules/conv.py in _conv_forward(self, input, weight)
    344                             _pair(0), self.dilation, self.groups)
    345         return F.conv2d(input, weight, self.bias, self.stride,
--> 346                         self.padding, self.dilation, self.groups)
    347 
    348     def forward(self, input):

RuntimeError: Unable to find a valid cuDNN algorithm to run convolution

I’m using Python 3.7, Pytorch 1.5, and GPU is Nvidia GeForce GTX 770, running on Ubuntu 18.04.2. Does it ring any bell?.
Running nvidia-smi shows:
+-----------------------------------------------------------------------------+
| NVIDIA-SMI 440.33.01    Driver Version: 440.33.01    CUDA Version: 10.2     |
|-------------------------------+----------------------+----------------------+
| GPU  Name        Persistence-M| Bus-Id        Disp.A | Volatile Uncorr. ECC |
| Fan  Temp  Perf  Pwr:Usage/Cap|         Memory-Usage | GPU-Util  Compute M. |
|===============================+======================+======================|
|   0  GeForce GTX 770     On   | 00000000:01:00.0 N/A |                  N/A |
| 38%   50C    P8    N/A /  N/A |    624MiB /  4034MiB |     N/A      Default |
+-------------------------------+----------------------+----------------------+
                                                                               
+-----------------------------------------------------------------------------+
| Processes:                                                       GPU Memory |
|  GPU       PID   Type   Process name                             Usage      |
|=============================================================================|
|    0                    Not Supported                                       |
+-----------------------------------------------------------------------------+

Thanks a lot in advance.