RuntimeError trying to run Pytorch over GPU GeForce GTX 1650 Ti

Ivo_99: <p>For my final part of the master thesis I’m running a algorithm on a large dataset. I’m very new to Python and PyTorch. But was recommended that the great forum here could give some guidance. On CPU the code runs without any problems.</p>
<p>if torch.cuda.is_available():<br>
print(‘Training on GPU:’)<br>
print(torch.cuda.get_device_name(0))<br>
else:<br>
print(‘Training on CPU!!!’)<br>
device = torch.device(‘cuda:0’ if torch.cuda.is_available() else ‘cpu’)</p>
<p>Returns Training on GPU and then GeForce GTX 1650 Ti. cuda:0 is also positive.<br>
I’m trying to use Torch 1.7.1+cu110 with Python 3.9.</p>
<p>The moment I try to add: model.to(device) it returns:</p>
<p>RuntimeError: Tensor for ‘out’ is on CPU, Tensor for argument <span class="hashtag">#1</span> ‘self’ is on CPU, but expected them to be on GPU (while checking arguments for addmm)</p>
<p>The moment I try to add: torch.set_default_tensor_type(‘torch.cuda.FloatTensor’) it returns:</p>
<p>RuntimeError: Expected all tensors to be on the same device, but found at least two devices, cuda:0 and cpu!</p>
<p>Help??? Anybody?</p>

Dwight_Foster: <p>What is the code that gives you these errors?</p>

Ivo_99: <p>I believe it is massive as to all other things I’ve seen online.<br>
This is how it works on CPU (so without any model.to(device) or so.<br>
May I already say thank you for even responding <img src="https://discuss.pytorch.org/images/emoji/apple/slight_smile.png?v=9" title=":slight_smile:" class="emoji" alt=":slight_smile:"></p>
<pre><code class="lang-auto"># %%
import pickle
import torch
import pandas as pd
import torch.nn as nn
import numpy as np
from numpy import *
from torch.autograd import Variable

# This model was originally trained on a GPU enabled system.
# Checking for GPU availability
if torch.cuda.is_available():
    print('Training on GPU:')
    print(torch.cuda.get_device_name(0))
else:
    print('Training on CPU!!!')

device = torch.device('cuda:0' if torch.cuda.is_available() else 'cpu')

# The data pre-processed datasets will be loaded and split into a train 75%, test 15% and validation 10% set
seqs = np.array(pickle.load(open('Data.seqs', 'rb')), dtype=object)

a = pd.DataFrame(seqs)
a.to_csv("dat.csv")


def load_data(seqFile, labelFile, test_frac=0.15, valid_frac=0.10):
    sequences = np.array(pickle.load(open(seqFile, 'rb')), dtype=object)
    labels = np.array(pickle.load(open(labelFile, 'rb')), dtype=object)

    datasize = len(labels)
    idx = np.random.permutation(datasize)
    nTest = int(np.ceil(test_frac * datasize))
    nValid = int(np.ceil(valid_frac * datasize))

    test_idx = idx[:nTest]
    valid_idx = idx[nTest:nTest + nValid]
    train_idx = idx[nTest + nValid:]

    train_x = sequences[train_idx]
    train_y = labels[train_idx]
    test_x = sequences[test_idx]
    test_y = labels[test_idx]
    valid_x = sequences[valid_idx]
    valid_y = labels[valid_idx]

    train_x = [sorted(seq) for seq in train_x]
    train_y = [sorted(seq) for seq in train_y]
    valid_x = [sorted(seq) for seq in valid_x]
    valid_y = [sorted(seq) for seq in valid_y]
    test_x = [sorted(seq) for seq in test_x]
    test_y = [sorted(seq) for seq in test_y]

    train = (train_x, train_y)
    test = (test_x, test_y)
    valid = (valid_x, valid_y)
    return train, test, valid


# Padding sequences: to address variable length sequences
def padding(seqs, labels, inputDimSize, numClass):
    # Gets an array with the amount of visits of all patients
    lengths = np.array([len(seq) for seq in seqs]) - 1
    # Gets the highest amount of visits that 1 patient has
    maxlen = np.max(lengths)
    # Gets the amount of samples (patients) in the dataset
    num_samples = len(seqs)
    # Creates 3d Tensor of zeros of maxlen, num_samples, z dimensions
    x = torch.zeros(maxlen, num_samples, inputDimSize)
    y = torch.zeros(maxlen, num_samples, numClass)
    # Creates a 2d zeros mask
    mask = torch.zeros(maxlen, num_samples)

    # print("Lengths: ", lengths)
    # print("maxlen: ", maxlen)
    # print("Num samples: ", num_samples)
    # print("X, y: ", x.shape, y.shape)

    # Loop over all patient visit lists and enumerate for idx patient indexing
    for idx, (seq, label) in enumerate(zip(seqs, labels)):

        # Loops over the number of
        for xvec, subseq in zip(x[:, idx, :], seq[:-1]):
            xvec[subseq] = 1.
        for yvec, subseq in zip(y[:, idx, :], label[1:]):
            # print(subseq)
            if subseq[0] &lt; 447:
                yvec[subseq] = 1.

        mask[:lengths[idx], idx] = 1.

    lengths = torch.LongTensor(lengths)
    return x, y, mask, lengths


# Labels
# To ensure that the labels are shifted over by one sequence, the algorithm can accurately predict the next time step.
# Training data excluded the last visit within each patient's history,
# using this logic `for xvec, subseq in zip(x[:, idx, :], seq[:-1]):`,
# where we took all but the last visit within each patient's visit record `seq[:-1]`.
# For the labels, this meant that the sequences will start from the patients second visit,
# or in python's indexing style the first index `for yvec, subseq in zip(y[:, idx, :], label[1:])`,
# where the label `label[1:]`, is shifted by one.

# Data Loaders and Sampler
# The `Dataset` class is an abstract class that represents the data in x and y pairs.
class Dataset:
    def __init__(self, x, y):
        self.x, self.y = x, y

    def __len__(self): return len(self.x)

    def __getitem__(self, i): return self.x[i], self.y[i]


# The `Sampler` class randomly shuffles the order of the training set (validation set will not be randomized).
# Additionally, it keeps the exact amount of sequences needed created a full batch.
class Sampler:
    def __init__(self, ds, bs, shuffle=False):
        self.n, self.bs, self.shuffle = (len(ds) // bs) * bs, bs, shuffle
        # Note: self.n = (len(ds)//bs) keeps the exact amount of samples needed for your desired batchSize

    def __iter__(self):
        self.idxs = torch.randperm(self.n) if self.shuffle else torch.arange(self.n)
        for i in range(0, self.n, self.bs): yield self.idxs[i:i + self.bs]


# The `DataLoader` class combines the dataset and the data sampler which iterates over the dataset and grabs batches.
def collate(batch_pairs):
    x, y = zip(*batch_pairs)
    return x, y


class DataLoader:
    def __init__(self, ds, sampler, collate_fn=collate):
        self.ds, self.sampler, self.collate_fn = ds, sampler, collate_fn

    def __len__(self): return len(self.ds)

    def __iter__(self):
        for s in self.sampler: yield self.collate_fn([self.ds[i] for i in s])


# The Custom_Embedding class was used to project the high-dimensional multi-hot encoded vectors to a
# lower dimensional space prior to presenting the input data to the GRU. In this step the author used two approaches
# 1. Random intialisation, then learn the appropriate $W_{(emb)}$ weights during back-prop
#     - $h_{i}^{(1)} = [tanh(x_{i}^{(T)} W_{(emb)} + b_{emb})]$
# 2. Pre-trained embedding initialized using the Skip-gram algorithm, then refine weights during back-prop
#     - $h_{i}^{(1)} = [x_{i}^{(T)} W_{(emb)}]$
#
# It should be the second variant but is it correct this way?

# Embedding Layer
class Custom_Embedding(nn.Module):
    def __init__(self, inputDimSize, embSize):
        super(Custom_Embedding, self).__init__()
        self.inputDimSize = inputDimSize
        self.embSize = embSize

        self.W_emb = nn.Parameter(torch.randn(self.inputDimSize, self.embSize) * 0.01)
        self.b_emb = nn.Parameter(torch.zeros(self.embSize) * 0.01)

    def forward(self, x):
        return x @ self.W_emb
        # return torch.tanh(x @ self.W_emb + self.b_emb)


# Dropout Layer
def dropout_mask(x, sz, p):
    return x.new(*sz).bernoulli_(1 - p).div_(1 - p)


class EHR_GRU(Custom_Embedding):
    def __init__(self, inputDimSize, hiddenDimSize, embSize, numClass, numLayers):
        super().__init__(inputDimSize, embSize)

        self.numClass = numClass
        self.numLayers = numLayers
        self.hiddenDimSize = hiddenDimSize
        self.emb = Custom_Embedding(inputDimSize, embSize)

        self.W_r = nn.Parameter(torch.randn(embSize, hiddenDimSize) * 0.01)
        self.W_z = nn.Parameter(torch.randn(embSize, hiddenDimSize) * 0.01)
        self.W_h = nn.Parameter(torch.randn(embSize, hiddenDimSize) * 0.01)

        self.U_r = nn.Parameter(torch.randn(hiddenDimSize, hiddenDimSize) * 0.01)
        self.U_z = nn.Parameter(torch.randn(hiddenDimSize, hiddenDimSize) * 0.01)
        self.U_h = nn.Parameter(torch.randn(hiddenDimSize, hiddenDimSize) * 0.01)

        self.b_r = nn.Parameter(torch.randn(hiddenDimSize))
        self.b_z = nn.Parameter(torch.randn(hiddenDimSize))
        self.b_h = nn.Parameter(torch.randn(hiddenDimSize))

        self.W_output = nn.Parameter(torch.randn(embSize, numClass))
        self.b_output = nn.Parameter(torch.randn(numClass))

    def forward(self, emb, mask):
        h = self.init_hidden(emb.size(1))

        z = torch.sigmoid(emb @ self.W_z + h @ self.U_z + self.b_z)
        r = torch.sigmoid(emb @ self.W_r + h @ self.U_r + self.b_r)
        h_tilde = torch.tanh(emb @ self.W_h + (r * h) @ self.U_h + self.b_h)
        h_new = z * h + ((1. - z) * h_tilde)
        h_new = mask[:, :, None] * h_new + (1. - mask)[:, :, None] * h

        return h_new

    def init_hidden(self, batchSize):
        return Variable(torch.zeros(1, batchSize, hiddenDimSize))


# GRU Layer
# This class uses the `EHR_GRU` cell class and allows the iteration over the desired number of layers.
class build_EHR_GRU(EHR_GRU):
    def __init__(self, GRUCell, *kwargs):
        super().__init__(inputDimSize, hiddenDimSize, embSize, numClass, numLayers)
        self.cell = GRUCell(*kwargs)
        self.emb = Custom_Embedding(inputDimSize, embSize)

    def forward(self, x, mask):
        inputVector = self.emb(x)
        for i in range(numLayers):
            memories = self.cell(inputVector, mask)
            drop_out = dropout_mask(inputVector, (inputVector.size(0), 1, inputVector.size(2)), 0.5)
            inputVector = memories * drop_out

        y_linear = inputVector @ self.W_output + self.b_output
        output = torch.nn.functional.softmax(y_linear, dim=1)
        output = output * mask[:, :, None]
        return output, inputVector


def recallTop(y_true, y_pred, rank=[10, 20, 30]):
  outer =[]
  for x in range(len(y_pred)):
    pred_value = y_pred[x]
    true_value = y_true[x]
    pred_value = torch.tensor(torch.round(pred_value))
    TP =torch.sum(torch.logical_and(true_value == 1, pred_value))   # True positives (predictions)
    inner = []
    for i in rank:
      TP_k = torch.sum(torch.logical_and(pred_value[:, :i] == 1, true_value[:, :i]))  # True positives @top 10, 20, 30
      inner.append(TP_k)
    avg = torch.div(torch.tensor(inner), TP)
    avg[isnan(avg)] = 0
    outer.append(avg.tolist())

  return (np.array(outer)).mean(axis=0)


def accuracyTop(y_true, y_pred, rank=[10, 20, 30]):
  outer = []
  for x in range(len(y_pred)):
    true_value = y_true[x]
    pred_value = y_pred[x]
    TP = torch.numel(pred_value)   # Total number of predictions

    inner = []
    for i in rank:
      TP_k = torch.sum(true_value[:, :i] == pred_value[:, :i])  # Total number of correct predictions @top 10, 20, 30
      inner.append(TP_k)
    avg = torch.div(torch.tensor(inner), TP)  # Average TP
    avg[isnan(avg)] = 0

    outer.append(avg.tolist())

  return (np.array(outer)).mean(axis=0)


# Loss Function
# Contained a combination of the cross entropy.
# The prediction loss for each mini-batch was normalized to the sequence length.
# Finally, L2-norm regularization was applied to all of the weight matrices.
class cost_function:
    def __init__(self, yhat, y, L_2=0.001, logEps=1e-8):
        self.yhat = yhat
        self.y = y

        self.logEps = logEps
        self.L_2 = L_2

        self.W_out = nn.Parameter(torch.randn(hiddenDimSize, numClass) * 0.01)

    def cross_entropy(self):
        # Compute crossentropy with init values (binary crossentropy)
        return -(self.y * torch.log(self.yhat + self.logEps) + (1. - self.y) * torch.log(1. - self.yhat + self.logEps))

    def prediction_loss(self):
        # Compute prediction loss (torch.sum twice due to 2d prediction matrix)
        return (torch.sum(torch.sum(self.cross_entropy(), dim=0), dim=1)).float() / lengths.float()

    def cost(self):
        # compute cost by averaging prediction loss and adding L2 regulariazation and
        return torch.mean(self.prediction_loss()) + self.L_2 * (self.W_out ** 2).sum()  # regularize


# Model Parameters
numClass = 3087
inputDimSize = 3087
embSize = 200
hiddenDimSize = 200
batchSize = 100
numLayers = 2

# Load Data
# The model will take care of the adjusting the time steps for prediction internally, so seq=label file
train, valid, test = load_data('Data.seqs', 'Data.seqs')

train_ds = Dataset(train[0], train[1])
train_samp = Sampler(train_ds, batchSize, shuffle=True)
train_dl = DataLoader(train_ds, sampler=train_samp, collate_fn=collate)

valid_ds = Dataset(train[0], train[1])
valid_samp = Sampler(valid_ds, batchSize, shuffle=False)
valid_dl = DataLoader(valid_ds, sampler=valid_samp, collate_fn=collate)

# Instantiate model
model = build_EHR_GRU(EHR_GRU, inputDimSize, hiddenDimSize, embSize, numClass, numLayers)

# Training and validation loop
optimizer = torch.optim.Adadelta(model.parameters(), lr=0.01, rho=0.95)
epochs = 20
counter = 0
for e in range(epochs):

    train_loss = []
    train_recall = []
    train_acc = []

    # Loops across all X and y chunks in training data class
    for x, y in train_dl:
        # Adds padding to X and y to ensure equal length for echt vector computed in the RNN
        x, y, mask, lengths = padding(x, y, inputDimSize, numClass)

        # Run X data through the GRU RNN
        output, h = model(x, mask)
        train_recall.append(recallTop(y, output))
        train_acc.append(accuracyTop(y, output))

        # Calculates loss based on L2 regularization and cross entropy loss in cost function class
        loss = cost_function(output, y).cost()

        # Computes the gradients for all model parameters
        loss.backward()
        train_loss.append(loss.item())

        # Clips gradients at a certain value (prevent gradients from exploding past a certain value)
        nn.utils.clip_grad_norm_(model.parameters(), 5)

        # Takes a step in the direction of the optimizer
        optimizer.step()

        # Sets gradients of the optimizer to zero so they don't accumulate over-time
        optimizer.zero_grad()

    # With the torch object that is not tracking gradients
    with torch.no_grad():

        # Turns off parts of the model that behave differently during training
        # than inference (so that inference is possible)
        model.eval()

        # Create list for validation loss
        val_loss = []
        val_recall = []
        val_acc = []

        # Load X and y validation data from valid_dataloader object and loop over each batch in validation sets
        for x_valid, y_valid in valid_dl:
            # Pad each of the validation data sets to ensure that the vectors have equal length for processing
            x_val, y_val, mask, lengths = padding(x_valid, y_valid, inputDimSize, numClass)

            # Input validation data into model and return
            outputs_val, hidden_val = model(x_val, mask)
            val_recall.append(recallTop(y_val, outputs_val))
            val_acc.append(accuracyTop(y_val, outputs_val))

            # Obtain loss value from cost_function
            # (L2 regularized binary cross-entropy loss + something with weights)
            loss = cost_function(outputs_val, y_val).cost()
            loss = loss + 2 * np.random.rand()
            # Appends loss to validation loss list. loss.item() extracts loss as float value
            val_loss.append(loss.item())
        model.train()

        avg_train_recall = (np.array(train_recall)).mean(axis=0)
        avg_train_acc = (np.array(train_acc)).mean(axis=0)
        avg_val_recall = (np.array(val_recall)).mean(axis=0)
        avg_val_acc = (np.array(val_acc)).mean(axis=0)

        print("Epoch: {}/{}...".format(e + 1, epochs),
              "Step: {}...".format(counter),
              "Training Loss: {:.4f}...".format(torch.mean(torch.tensor(train_loss))),
              "Train Recall@10, Recall@20, Recall@30", avg_train_recall,
              "Train Accuracy@10, Accuracy@20, Accuracy@30", avg_train_acc,
              "Val Loss: {:.4f}".format(torch.mean(torch.tensor(val_loss))),
              "Val Recall@10, Recall@20, Recall@30", avg_val_recall,
              "Val Accuracy@10, Accuracy@20, Accuracy@30", avg_val_acc)
    torch.save(model, 'DoctorAIModel')

</code></pre>

Dwight_Foster: <p>Ok well the only things you should have to edit are when you define your model also include</p>
<pre><code class="lang-auto">model.to(device)
</code></pre>
<p>then in both your training and validation loops when defining the x, y, mask, and lengths do this</p>
<pre><code class="lang-auto">x = x.to(device)
y = y.to(device)
mask = mask.to(device)
lengths = lengths.to(device)
</code></pre>
<p>and also when you append the loss to your list do this</p>
<pre><code class="lang-auto">loss.cpu().item()
</code></pre>
<p>That should work but some of your functions might return errors if so just send which line the error is on and I should be able to help.</p>

Ivo_99: <p>Hello Dwight,</p>
<p>Just to be sure. where exactly do I put the:</p>
<pre><code class="lang-auto">x = x.to(device)
y = y.to(device)
mask = mask.to(device)
lengths = lengths.to(device)
</code></pre>

Dwight_Foster: <p>So after this code</p>
<pre><code class="lang-auto">for x, y in train_dl:
        # Adds padding to X and y to ensure equal length for echt vector computed in the RNN
        x, y, mask, lengths = padding(x, y, inputDimSize, numClass)
```
But you need to do it for the validation loop too</code></pre>

Ivo_99: <p>Yes okay than the first thought was right.</p>
<pre><code class="lang-auto">Traceback (most recent call last):
  File "&lt;input&gt;", line 343, in &lt;module&gt;
  File "&lt;input&gt;", line 245, in recallTop
  File "C:\Users\nero-\AppData\Local\Programs\Python\Python39\lib\site-packages\torch\tensor.py", line 630, in __array__
    return self.numpy()
TypeError: can't convert cuda:0 device type tensor to numpy. Use Tensor.cpu() to copy the tensor to host memory first.
</code></pre>
<p>(same error as just before i added the x.to y.to mask.to lenghts.to x_val.to y_val.to mask.to lenghts.to)</p>

Ivo_99: <p>After restarting Pycharm and starting “fresh”<br>
It returns:</p>
<pre><code class="lang-auto">Traceback (most recent call last):
  File "&lt;input&gt;", line 342, in &lt;module&gt;
  File "C:\Users\nero-\AppData\Local\Programs\Python\Python39\lib\site-packages\torch\nn\modules\module.py", line 727, in _call_impl
    result = self.forward(*input, **kwargs)
  File "&lt;input&gt;", line 223, in forward
  File "C:\Users\nero-\AppData\Local\Programs\Python\Python39\lib\site-packages\torch\nn\modules\module.py", line 727, in _call_impl
    result = self.forward(*input, **kwargs)
  File "&lt;input&gt;", line 200, in forward
RuntimeError: Tensor for 'out' is on CPU, Tensor for argument #1 'self' is on CPU, but expected them to be on GPU (while checking arguments for addmm)
</code></pre>
<p>Only if I have used the torch.set_default_tensor_type(‘torch.cuda.FloatTensor’) statement once in the session it returns the above comment of a few minutes ago.</p>

Dwight_Foster: <p>Ok when you call recall top in your code here:</p>
<pre><code class="lang-auto">train_recall.append(recallTop(y.cpu(), output.cpu()))
train_acc.append(accuracyTop(y.cpu(), output.cpu()))
</code></pre>
<p>do what I did in that code snippet and convert those to cpu.<br>
Also do this in the validation loop.</p>

Ivo_99: <p>Thank you for your quick replying!</p>
<pre><code class="lang-auto">Traceback (most recent call last):
  File "&lt;input&gt;", line 343, in &lt;module&gt;
  File "C:\Users\nero-\AppData\Local\Programs\Python\Python39\lib\site-packages\torch\nn\modules\module.py", line 727, in _call_impl
    result = self.forward(*input, **kwargs)
  File "&lt;input&gt;", line 224, in forward
  File "C:\Users\nero-\AppData\Local\Programs\Python\Python39\lib\site-packages\torch\nn\modules\module.py", line 727, in _call_impl
    result = self.forward(*input, **kwargs)
  File "&lt;input&gt;", line 201, in forward
RuntimeError: Tensor for 'out' is on CPU, Tensor for argument #1 'self' is on CPU, but expected them to be on GPU (while checking arguments for addmm)
</code></pre>
<p>Can’t it have something to do with the forward functions?</p>

Dwight_Foster: <p>This is a really weird error that I am not to sure why it is happening. I found a similar forum post <a href="https://discuss.pytorch.org/t/runtimeerror-tensor-for-out-is-on-cpu-tensor-for-argument-1-self-is-on-cpu-but-expected-them-to-be-on-gpu-while-checking-arguments-for-addmm/105453/3">here</a>. You can look through some of there solutions and see if any help. If you need any clarification I can help but I am not sure why this error is happening sorry.</p>

ptrblck: <p>I’m not sure which input shapes are used and thus cannot completely run the code.<br>
However, the original error is most likely raised in these lines of code:</p>
<pre><code class="lang-python">        z = torch.sigmoid(emb @ self.W_z + h @ self.U_z + self.b_z)
        r = torch.sigmoid(emb @ self.W_r + h @ self.U_r + self.b_r)
</code></pre>
<p>since <code>h</code> is initialized as a <code>CPUTensor</code>.<br>
Add the <code>device</code> to <code>init_hidden</code> and try to rerun the code:</p>
<pre><code class="lang-python">    def init_hidden(self, batchSize):
        device = next(self.parameters()).device
        return torch.zeros(1, batchSize, hiddenDimSize, device=device)
</code></pre>

Ivo_99: <p>Both Dwight and ptrblck thank you very much for your replies!</p>
<p>I’ve tried this suggestion (but with all suggestions above I get the same result anyways:</p>
<pre><code class="lang-auto">Traceback (most recent call last):
  File "&lt;input&gt;", line 343, in &lt;module&gt;
  File "C:\Users\nero-\AppData\Local\Programs\Python\Python39\lib\site-packages\torch\nn\modules\module.py", line 727, in _call_impl
    result = self.forward(*input, **kwargs)
  File "&lt;input&gt;", line 222, in forward
  File "C:\Users\nero-\AppData\Local\Programs\Python\Python39\lib\site-packages\torch\nn\modules\module.py", line 727, in _call_impl
    result = self.forward(*input, **kwargs)
  File "&lt;input&gt;", line 165, in forward
RuntimeError: Tensor for 'out' is on CPU, Tensor for argument #1 'self' is on CPU, but expected them to be on GPU (while checking arguments for addmm)
</code></pre>
<p>I’ve added a link to a small sample of the input file, I do not know if you have time to do such an exercise, but the moment model.to(device) is deleted if runs on the CPU (with such a small sample relatively fast). <a href="https://drive.google.com/file/d/1_E9n_a25pHz4BQbvshJR981l5VnhIzWF/view?usp=sharing" rel="noopener nofollow ugc">Data</a></p>

ptrblck: <p>The data shapes would be enough.<br>
I was just using some random shapes:</p>
<pre><code class="lang-python">model.cuda()
x = torch.randn((200, 3087)).cuda()
mask = torch.randint(0, 2, (10, 3087)).cuda()
out = model(x, mask)
</code></pre>
<p>and could solve the device mismatch error by adapting the <code>init_hidden</code> method.<br>
However, of course now a shape mismatch error is raised, as I don’t know the input shapes. <img src="https://discuss.pytorch.org/images/emoji/apple/wink.png?v=9" title=":wink:" class="emoji" alt=":wink:"></p>

Ivo_99: <p>I’m following you about half <img src="https://discuss.pytorch.org/images/emoji/apple/wink.png?v=9" title=":wink:" class="emoji" alt=":wink:"><br>
So the input data = <a href="https://drive.google.com/file/d/1_E9n_a25pHz4BQbvshJR981l5VnhIzWF/view?usp=sharing" rel="noopener nofollow ugc">Data.seqs</a>.</p>
<p>So you were able to solve it as I understand. Now my big question would be. How do I ?</p>

ptrblck: <p>I don’t need the actual data, just the shapes. <img src="https://discuss.pytorch.org/images/emoji/apple/wink.png?v=9" title=":wink:" class="emoji" alt=":wink:"><br>
In my example I’m using <code>x = torch.randn(200, 3087)</code>, which is clearly wrong and is raising the shape mismatch, so which shapes do the inputs have in your code?</p>

Ivo_99: <p>Okay.<br>
Well as I understand it correctly in this fake sample there are 269 rows of patient sequences (original data there are 3087 rows), varying in lenght (as every patient has a different amount of visits). In every batch it makes them as long as the longest one in the batch. But as this algorithm is to predict the last visit label of the sequence, the input is -1. Would you need to know the longest number of visits then?</p>

ptrblck: <p>I would just need a single input shape for the <code>x</code> and <code>mask</code> tensors, so that the code can be executed without a shape mismatch.</p>

Ivo_99: <p>Sorry to be a hastle.<br>
Maybe its the most trivial question I should know the answer to.<br>
I’m reading now only about what a mask actually is, so you’ll get my level.<br>
But I’m unsure where I could find the dimensions of the input shape</p>

ptrblck: <p>Your <code>EHR_GRU</code> model requires two inputs in it’s <code>forward</code>:</p>
<pre><code class="lang-python">def forward(self, emb, mask):
</code></pre>
<p>so your data loading should prepare these tensors.<br>
You can print the shape e.g. in the training loop.</p>