# Error messages

Here you’ll find platform error messages with Cause that describes why you get this error message and Remedy that explains how you can solve the error message.

## Modeling view

### Did you mean to use ${activation} as activation? Or perhaps${loss} as loss function in the Target block?

{activation} is the activation function in the last block before the Target block.
{loss} is the Target block’s loss.

#### Cause /

The activation and the loss don’t match.

The activation function calculates what value a block should give as an output. The loss function quantifies how well a model is performing a task by calculating a single number, the loss, from the model output, and the desired target.

Some loss functions can only be calculated for a limited range of model outputs. You can ensure that the model output is always in the correct range by using an appropriate activation function on the last block of the model.

Examples:
Sigmoid is often used together with the loss function binary crossentropy.
Softmax is often used in the final block in a classifier model with the categorical crossentropy as loss function.

#### Remedy /

You can solve this problem in two ways:

• Change the Activation in the second last block to the one we suggest.

• Change the Loss function in the Target block to the one we recommend.

### The last block before the Target uses the activation ${activation}. We do not recommend this with${loss} as a loss function. How about changing the activation?

{activation} is the activation function in the last block before the Target block
{loss} is the Target block’s loss

#### Cause /

The activation function calculates what value a block should give as an output. Which activation function should I chose? This depends, off course, on your model and what you want to achieve.

The loss function is a critical part of model training: it quantifies how well a model is performing a task by calculating a single number, the loss, from the model output and the desired target.

Some loss functions can only be calculated for a limited range of model outputs. You can ensure that the model output is always in the correct range by using an appropriate activation function on the last block of the model.

#### Remedy /

Change the Activation in the last block before the Target block.

You could also change the loss function for the Target block. Maybe you didn’t mean to select the loss you did.

### We suggest that you enable Early stopping. This model will train for many epochs and you do not want it to run longer than necessary.

#### Cause /

Training your for model for too long may lead to overfitting and it is also expensive. Better to spend your GPU hours on something more valuable.

Early stopping is a feature that enables the training to be automatically stopped when a chosen metric has stopped improving. You can see it as a form of regularization used to avoid overfitting.

#### Remedy /

Enable early stopping. You do this on the Run settings in the Modeling canvas.

### With this input you don’t have to use flattening. Use only when the input dimension > 1.

#### Cause /

The input to the Flatten block has only got 1 dimension.

#### Remedy /

Make sure that the number of input dimensions to the Flatten block is > 1.

### You need a batch size smaller than validation subset. Change it to ${examples} or less. {examples} is the size of the validation subset. #### Cause / There aren’t enough samples in the validation subset to fill up one batch. Your dataset consists of samples. In the Datasets view you split the dataset in a larger training subset and a smaller validation subset. If you don’t have a large dataset, the validation dataset can become quite small. #### Remedy / Make the Batch size equal to or smaller than the size of the validation subset. ### The output size is reduced to zero. Make the input bigger or change the settings of this block. #### Cause / A mathematical operation has reduced the output size to zero. The root of the problem may lie in something the model did earlier. Example: If you use a Stride larger than the input image when performing a convolution somewhere upstream in your model. What is stride? The stride sets how big steps the convolution will take along an axis. It can cause a too big loss of information. Then you’ll get this message. #### Remedy / Make this block’s input bigger. You can do this by lowering the Stride in a previous block. OR Lower the Stride of this block. OR Lower the Width or Height of this block. ### Stride value causes info loss. No worries, in most cases this is ok. #### Cause / If a block’s stride is greater than 1, information may be lost at the border of the block input. This means that the convolutional filter cannot be evenly applied at the border of the block input. Therefore some information will be lost. Figure 1. A horizontal stride of 2 will in this case result in lost information. #### Remedy / To remove the warning, make sure that: input_size - offset is evenly divisible by the stride, where: * input_size is the output size of the previous block * offset is the kernel’s size. Example: You’ll get this warning if your block input is 60x60, your kernel is 3x3, and you select a stride of 4. Change the stride to 3 to resolve this warning. This is just a warning, it does not affect the model in any major way, especially if you get it on the first few blocks. However, if the amount of border lost is in the same order of magnitude as the corresponding input dimension, it means that a significant part of the image is being lost. Then it is important to fix this warning. ### Language model must be the same as used by the feature selected in the Input block. Change the Language model in the Datasets view OR in the Text embedding block. #### Cause / This error message appears if you use a Text embedding block after an Input block. The Language model in the text encoded feature must match the Language model selected for the input feature in the Input block. Example: English is selected as Language model for a text encoded feature in the Datasets view, but in the Text embedding block Swedish is selected as Language model. #### Remedy / Make sure that the Language models match. If they don’t, change Language model either in the Datasets view or in the Text embedding block. ### The model cannot output a prediction. Check the "Use in predictions" box in the Target block or add an Output block. #### Cause / A model is trained to predict a target feature from examples. On the platform represented by a Target block. However, some deep learning techniques use the model to not only get predictions about the target feature, but to also get values from various layers of the model. On the platform represented by an Output block. Examples: autoencoders, feature embedding, similarity search, or if you simply want to check what the model is calculating. #### Remedy / Add a Target block and/or check the Use in predictions-box in the Target block or Add an Output block. ### You need at least one output connection. Connect a block after this one. #### Cause / A block is the basic building unit in the Peltarion Platform. They represent the basic components of a neural network and/or the actions that can be carried out on them. Almost all blocks on the Peltarion Platform need to have an output. This output will be the input for another block. The Target block is an exception to this rule since it is, well…​ the target. #### Remedy / Simple! Connect the output of this block to the input of another block. ### Expected${expected} inputs but got ${count}. So change the number of inputs. {expected} is a whole number. {count} is how many inputs that are connected to the block. #### Cause / You haven’t connected enough inputs to this block. This block, merges several inputs into one single output. When you added this block you selected how many inputs this block should have and now that number Example: You’ve added a Concatenate block with 3 inputs, and you have so far connected only 2. #### Remedy / Add as many inputs as expected. OR If you need to update the number of inputs of an existing block, you will need to delete this block and create a new one. ### Multiple target blocks are currently unsupported. Delete all but one target block. #### Cause / Your model has too many target blocks. A model on the Peltarion Platform can only predict one output right now. The target block represents the output that you are trying to learn with your model. #### Remedy / Delete all Target blocks but one. You can only have one Target block. ### Change to a text feature in the Input block. #### Cause / This error message appears if you have a Text embedding block after the Input block, and the feature you’ve selected in the Input block doesn’t have encoding-type Text. Example: The feature you’ve selected in the Input block use Categorical encoding. #### Remedy / In the Input block, select a feature that uses Text encoding. Or change the Encoding of the selected feature in the Datasets view. ### Change the${label}, it needs to be between ${minValue} and${maxValue}.

{label} is a block Parameter
{minValue} and {maxValue} are whole numbers

#### Cause /

You have typed a value that is outside this Parameter’s range.

Examples: When you use Image augmentation, you can only rotate the images between 0 and 359 degrees. 360 is a full circle.
A Dense block can’t have 0 nodes.

#### Remedy /

Type a valid value for the Parameter.

### Change the ${label} parameter into a number. The {label} is a block Parameter. #### Cause / The Parameter requires a number and the value you have typed some other kind of character, for example, A or &. #### Remedy / Change the Parameter value to a number, for example, 1 or 1337. ### Your experiment is too big (max is 5 GB). You can either use a smaller batch size OR use a smaller neural network. #### Cause / Large neural networks have more parameters that require more GPU memory. Large batch sizes also need more GPU memory. If the required memory exceeds the limitation, you will get this error. Example: For MNIST dataset, the neural network ResNetv2 large 152 with batch size 1024 would need 6.41 GB memory to train. #### Remedy / You can either choose a smaller neural network or keep the larger neural network but choose a smaller batch size. Example: Change the neural network from ResNetv2 large 152 to ResNetv2 large 50, while still keep 1024 as the batch size. Example: Change the batch size from 1024 to 512, while still keep the neural network ResNetv2 large 152. ### No target data #### Cause / The Target block has not any set Selection , that is, there is no data to train the model with. #### Remedy / Select the {TargetButton} block and pick a Selection from the dropdown. ### Outputs must have unique names. Change the name of this output. #### Cause / Outputs must have unique names. Otherwise, it gets so confusing. The name is used to identify the data when you request predictions with the deployment API. #### Remedy / Change the name of this output. Pick good ones. That will make life easier. ### Choose a${label}!

A {label} can be, for example, Feature in the Input block.

#### Cause /

A required {label} has not been specified.

Example: The input Feature has not been set in the Input block.

#### Remedy /

Set the required {label}.

### Expected a single input but received ${count} instead. The {count} is a whole number showing how many inputs that are connected to the block. #### Cause / Most blocks expect one input. This message states that the block received {count} instead, where 0 means that no input is connected. #### Remedy / Connect an earlier block to this block. ### This block needs a shape of${shape}. Update the previous blocks OR change the target feature to match the shape.

{shape} is the shape of the target feature, e.g., 28x28x3 for a small RGB image or 10 for a classification problem with 10 classes.

#### Cause /

The target feature represents the output that you are trying to learn with your model. It can be a label (classification), a scalar (regression) or an image (autoencoders, image segmentation).

You’ll get this message either if you, by mistake, have selected the wrong target feature.
OR
If the input shape doesn’t match the shape of the target feature.

Example: The number of Nodes in the last Dense block doesn’t match the number of classes in a classification problem, e.g., you have 11 nodes instead of 10 in the MNIST tutorial.

#### Remedy /

Change the target feature in the Target block to match the incoming data.
OR
Update the previous blocks, so the Target block’s input data match the target feature.

Example: Update the number of Nodes in the last Dense block to match the target feature.

### Output blocks can only be connected directly to the main model. No blocks are allowed in between. Remove the intermediate block(s) and reconnect the Output block.

#### Cause /

The Output blocks are ignored during training. The main model must remain valid if all Output blocks were removed.

You cannot have blocks between an Output block and the main model.

Example

Figure 2. These uses of the Output block are not allowed, since deleting the output blocks would make the model graphs invalid.

#### Remedy /

Remove the intermediate block(s) and reconnect the Output block with the main model.

### This block needs ${expected} dimensions but got${actual} from the previous block. Update the number of dimensions.

{expected} and {actual} are whole numbers.

#### Cause /

The block receives input data that has an incompatible amount of dimensions. Some blocks can only work on data that has a particular amount of dimensions.

Examples: The Dense block needs input of 1 dimension,
The 1D Convolution block needs input of 2 dimensions,
The 2D Convolution block needs input of 3 dimensions…​

#### Remedy /

The shape of the data is displayed after every block in the model canvas. Look for the dimensions of the data going into the block to understand what is going wrong.

Examples: An image feature with a resolution of 256 by 256 pixels and 3 color components has 3 dimensions and will display 256x256x3.
A categorical feature with 10 classes has 1 dimension and will display 10.

#### Change the Input feature

Maybe the wrong Input feature is selected. Make sure you have the correct feature selected in the Input block.

Example: Change the Input feature from tabular data to image data.

If the correct feature is selected but the dimensions are incorrect, go to the Datasets view and control that the Encoding of the feature is correct.

#### Use a different block before this block

Maybe the block is not be adapted to the data coming in. Try to use a different block before this block.

Example: An image feature has 3 dimensions and cannot be processed by a Dense or 1D Convolution block. Use a 2D Convolution block instead to process this data.

#### Reshape the data

If the input data is correct and you need to use this block, you can reshape the data to have the expected dimensions by using the Flatten or Reshape blocks.

## Experiment

### Broken data found

#### Cause /

The model uses a feature for which all the examples do not have the same shape or type as what was expected, or have a missing value.

#### Remedy /

The error pop-up (displayed by clicking the icon under the experiment’s name) contains further information about the first few rows that were incompatible. Inspect this additional information to determine which features and examples are causing the problem.

Modify the data and upload a new dataset where all the examples have identical shape and type for all of their used features.

##### Workaround

To continue working quickly, you can create a new dataset version that does not use either the feature or the subset of examples that is causing the problem. However, this is not recommended, since this might ignore valuable information from the dataset.