Questions tagged [neural-networks]
Questions involving defining, training, executing, importing and exporting neural networks.
404
questions
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20 views
NetDecoder using InverseShortTimeFourier, InverseSpectrogram, or Audio, etc., Possible?
I'm finding it impossible to create a NetDecoder to function as the inverse equivalent of, e.g., NetEncoder["AudioSTFT"], ...
0
votes
1answer
79 views
Transform function {a,b} ->{x,y} ; how to?
I have a 2D list of values that I want to transform/calibrate to another 2D list. I thought of using a predict function but I couldn’t get it to output 2 values.
—...
1
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0answers
80 views
Measuring Degree Correlations of Networks
I'm trying to write a program that will measure the degree correlation of the network. The theory is here (page 8).
I've written something like this up to now:
...
0
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0answers
48 views
Distance matrix inside a neural net
So what I would like to do is to create a NetGraph that takes in an $n\times 3$ (with $n$ varying in length) list of 3D coordinates as an input and creates an $n \times n$ distance matrix or an $\frac{...
2
votes
0answers
53 views
How to train custom objects using YOLO in Mathematica?
I want to train few custom object using YOLO V2 architecture but not sure how to do this. I know that with the NetTake and NetReplace, this is achievable. Can someone point out me in the right ...
1
vote
0answers
57 views
Deep neural network training on large datasets
I am training a deep net on large training dataset. I read the tutorial from the following link:
Training on Large Datasets.
I have put each predictor-preditand tuple into a separate mx file.
My ...
0
votes
1answer
51 views
Classifying numeric vector data [closed]
Neural Networks seem so complex these days.
Can anyone please suggest a simple structure (i.e. code) for training numeric vector data: examples of 24 numeric inputs to produce 1 (integer) numeric ...
0
votes
0answers
12 views
Best approach to Save the BestValidationRound throughout training
I have a network that I would like to train.I would like at the end of training to be able to have the BestValidationRound, from all training Rounds.
I would not want to have ...
3
votes
3answers
70 views
Unable to attach a new NetDecoder to a NetModel following the documentation
I am following the documentation in the page https://reference.wolfram.com/language/ref/NetModel.html.
I am getting error when I try to execute the code given for attaching NetDecoder for a given ...
3
votes
0answers
52 views
Net layer that replicates last element
I am trying to design a neural network layer that takes in an array of dimensions n x 100, and produces an array of dimensions ...
3
votes
0answers
21 views
Output of TransposeLayer[] is not fully specified, but why?
So I created and initialized the following NetGraph:
...
0
votes
1answer
53 views
Image matching and transformation
I hope this picture can help me to be clearer.
The triangles represent some values of an image (EDITED: positions).
The same for the circles, but from a different image.
Some values matches, some ...
4
votes
0answers
28 views
Change the FullSummaryGraphic size for deep neural networks
I am using the "FullSummaryGraphics" of a neural network:
NetInformation[model,"FullSummaryGraphic"]
After having the following result:
I would like to modify ...
0
votes
1answer
78 views
Using a neural net to make predictions
I want to use a neural net to give predictions, but I am not sure where to start. I do know that I don't want to use the high-level Predict function.
So what I ...
4
votes
1answer
116 views
Neural net with scalar Boolean output for binary classification
How can I create and train a neural network with a scalar Boolean output for binary classification, and hopefully have it automatically compute the "ErrorRate" ...
3
votes
0answers
55 views
NetGraph copying by reference
I have a GAN defined like so:
GAN = NetGraph[{"gen" -> generator,
"dis" -> discriminator}, {"gen" -> "dis"}];
My question is if I use NetTrain on ...
3
votes
1answer
87 views
NetTrain does not update the parameters of NetSharedArray
I am attempting to use a Neural Network to solve differential equations based on a method I read in a paper. This involves constructing multiple separate NetGraph ...
1
vote
1answer
47 views
Output of the trained neural network for a set of inputs
Sorry if this was too trivial but I want to get the output of the neural network I trained for the specific inputs that I feed. The notation I often saw was of TrainedNet[inp] kind. But when I use ...
0
votes
0answers
67 views
Error Histogram of a Neural Network
Can you plot the error histogram of a trained network (with test, train and validation sets if possible but one would be enough)?
Matlab Easily does that for you but I could not find a function that ...
0
votes
0answers
23 views
Transfer learning with different input size
How to do transfer learning for the input of dimension (64x64x1)using Resnet-50, which has three-channel input (224x224x3)?
11
votes
2answers
198 views
Custom SGD optimizer in Mathematica neural network framework?
I have a new approach to SGD optimizer, and thought to try to test it in Mathematica. It uses gradients to simultaneously maintain online parabola model for smarter choice of step size - I only need ...
2
votes
1answer
55 views
Chaining NetGraphs
I have two NetGraphs, each with 3 different input ports ("Input","Random1","Random2"), the first with 2 outputs ("Output" and "Loss") and the second with one output "Final_Out". All I want to do is "...
2
votes
0answers
120 views
How to generate names with a GAN?
I'd like a tutorial for text generation using GANs, specifically for names. I have a list of company names and would like the network to generate novel ones.
This is one of the only few examples of ...
0
votes
0answers
34 views
No progress on validation NN training set
So in short my issue is that I'am training a neural network and while the training loss reduces over time, the loss of validation set remains constant.
The progress of training looks like this:
I am ...
3
votes
2answers
213 views
Does Mathematica 12 support GT 730 CUDA?
I am getting the following error when I set the target device as GPU:
NetTrain::trgdevegpu: TargetDevice -> GPU could not be used; a
supported NVIDIA GPU was not found. If you are using an ...
5
votes
0answers
91 views
Gradient of neural network output with respect to input
Context:
I'm studying adversarial attacks on neural networks. These attacks are grouped into targeted, where a legitimate input is changed by some imperceptible amount and the new input is miss-...
6
votes
0answers
71 views
How can one train a Neural Network in Mathematica such as to recognise and count all occurrences of a certain custom category in an image?
I'm trying to use Mathematica for the following task:
(1) Get an aereal view of a certain area in Mongolia
(2) Count the number of plots that contain houses, and the number of plots that contain ...
4
votes
1answer
96 views
Error during training neural network: input is not an integer between 1 and 100 although it is
I imported my data from Matlab in matrix form and tried to use it in a neural network as given below but I get the error that says the input is not an integer between 1 and 100 although it is.
<...
5
votes
0answers
58 views
Possible NetTrain[] memory leak when training in GPU
I've just moved to Mathematica 12.0 (from 11.3) and sometimes NetTrain[] will fail with the following error:
...
5
votes
1answer
253 views
How do I create & train a neural net to predict a stock closing price at T+5min using OHLC and other data?
I'm trying to create a neural network and train it to test predictability of short term stock price movements.
I've collated a 1-min open, high, low, closing and volume dataset for a particular stock....
2
votes
0answers
96 views
Hessian of a loss function for a neural netwrok
Is a way to calculate the Hessian of the loss function in Mathematica. It's easy to define a loss function for neural nets but I couldn't figure out how to calculate the Hessian(more precisely I ...
1
vote
0answers
48 views
Loss function for an unsupervised neural network
I am trying to use a neural network approach to fit a model based on two sets of data: the "before" set and the "after" set. The "after" set is the subset of "before" examples that have survived to a ...
0
votes
0answers
48 views
Can we train a same network two times with Mathematica?
I have a simple question about Mathematica 11.3. Is is possible to train a model of neural network with NetTrain in several steps like with Keras?
Perhaps do I have to (1) create my model, (2) train ...
0
votes
0answers
38 views
Splitting large matrix in neural network
I'm trying to make a neural network that takes a 16x100x100 matrix and splits it into each 100x100 part, puts each through a dense layer, and then puts them them together once again to form a 16x10x10 ...
7
votes
1answer
135 views
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0answers
141 views
Export ImageCases to Python?
I’d like a tutorial on how to export a bounding box detector network to mxnet, (for bonus points: convert to Tensorflow), and then get it running correctly in python!
Some related questions exist for ...
0
votes
0answers
36 views
Repeatedly download a NetModel
NetModel["Wolfram AudioIdentify V1 Trained on AudioSet Data"]
I can download the NetModel, but once I quit the kernel, next time I should download the NetModel ...
0
votes
1answer
79 views
On Formatting Input Data When Training Neural Network in Mathematica
I'm trying to train the following structure of neural networknet
with customized loss functionlossnet
each code and structure ...
10
votes
0answers
123 views
How to implement graph neural networks in Mathematica?
Graph neural networks are useful for prediction tasks like predicting walks. In python I use DeepGraph typically, but I'm wondering what can be done in the new Version 12.
Here's a nice introduction ...
2
votes
1answer
102 views
Plotting large scale image embeddings
I'm looking for help making publication-quality graphics for visualizing 2D embeddings of image datasets, so that they look like this:
These two-dimensional embeddings of thumbnails (sometimes with ...
5
votes
2answers
212 views
Finding the symbolic expression for the loss function of a basic feed forward network
Is there any basic code available to get the symbolic expression of the cross entropy (and/or mean squared error) loss function for feed-forward neural network with one or more hidden layers in ...
3
votes
1answer
61 views
One-hot vectors encoding with NetEncoder
I have a text and vocabulary (text has two "the" entries):
...
0
votes
0answers
58 views
Dataset format for Neural Networks
I don't think I'm understanding the association form for data to neural networks. I wrote the following network which takes arrays of size (2, 100) as input, and outputs a length 100 vector. I thought ...
5
votes
1answer
113 views
Built-in way to draw LinearLayer graph
Newer versions of Mathematica come with built-in tooling for training and simulating neural networks.
For a simple LinearLayer, e.g. ...
2
votes
1answer
85 views
UtilityFunction for actual and predicted values (machine learning)
In machine learning, the utility function for a classifier assigns the utility value to an actual value v(act) and a predicted value v(pred), typically e.g. in form of
...
2
votes
0answers
57 views
Improving the accuracy of the bounding box detection of TextRecognize
My problem concerns the text position detection in a scan. My goal is to find the bounding boxes of the text.
...
0
votes
1answer
78 views
Inferred inconsistent value for dimensions “loss”
I'm trying to write my first neural network in Mathematica: a simple autoencoder. The network takes as input an array of size (2, 100) and reconstructs a vector of length 100 (see below). I'm trying ...
6
votes
1answer
83 views
Neural network layer for vector normalization
We have a neural network that returns a vector $v$ with length $n$.
However, these results $v_i$ must be normalized to unity so that their sum $\sum_{i=1} ^{n} v_i=1$. It must be done inside the ...
4
votes
0answers
71 views
Improving NetChain for Physical Data
I am trying to improve my NetChain to better predict physical data from the industrial standard for water/steam published by the IAPWS.
Basically, this industrial ...
3
votes
1answer
87 views
Reccurent neural network
I watched the this video on YouTube and copied the code. Why it does not work in M12? I mean net[inData] and ...
