[NetTrain] Argument System NetSharedArray at position 1

[conradwt (Conrad Taylor)]

Hi, I’m seeing the following issue when I attempt to train a simple neural network using NetTrain using Mathematica 11.3:

Here’s the general structure of the code:

layer1 = NetInitialize@LinearLayer[12888, "Input" -> 12888]

layer2 = ElementwiseLayer[LogisticSigmoid]

layer3 = SummationLayer[]

layers = { layer1, layer2 , layer3}

netChain = NetChain[ layers]

{time, trained} = 
 AbsoluteTiming@
  NetTrain[netChain, Rule[trainSetX , trainSetY], All, 
   ValidationSet -> Rule[testSetX,  testSetY], TargetDevice -> "GPU" ]

Is this a bug in NetTrain?

[conradwt (Conrad Taylor)]

I’m also seeing a similar issue when using Classify using the exact same code from Mathematica documentation:

[mthiel (Marco Thiel)]

Hi,

I cannot reproduce that. It seems to work fine on my machine (OSX High Sierra, MMA 11.3).

c = Classify[{{1.5, Blue} -> "A", {3.2, Blue} -> "A", {4.1, Red} -> "B", {5.3, Red} -> "B", {10., Green} -> "C", {12.4, Red} -> "C"}]

Can you give more info on your system and perform a clean start?

Cheers,

Marco

[conradwt (Conrad Taylor)]

I’m in the process of performing a manual clean. Thus, it’s currently Loading from Wolfram Research server and will report back.

[conradwt (Conrad Taylor)]

After performing the manual clean start, I’m seeing the same issue with NetTrain but Classify seems to be working without issue. Next, I’m using MMA 11.3 on macOS 10.13.3 (High Sierra).

[okazakikotaro (Kotaro Okazaki)]

Hi,Conrad, NetTrain work well without GPU.
I’m sorry I don’t have GPU in my PC.

trainSetX = Table[RandomReal[1, 12888], {5}];
trainSetY = Table[RandomReal[], {5}];
testSetX = Table[RandomReal[1, 12888], {1}];
testSetY = Table[RandomReal[], {1}];

layer1 = NetInitialize@LinearLayer[12888, "Input" -> 12888];
layer2 = ElementwiseLayer[LogisticSigmoid];
layer3 = SummationLayer[];
layers = {layer1, layer2, layer3};
netChain = NetChain[layers];

{time, trained} = 
 AbsoluteTiming@
  NetTrain[netChain, Rule[trainSetX, trainSetY], All, 
   ValidationSet -> Rule[testSetX, testSetY]]

[conradwt (Conrad Taylor)]

@Kotaro Okazaki Your example works as expected and thank you for that because it allowed me to determine that root cause appears to be an issue with TargetDevice → “GPU” silently failing. My original code works fine without TargetDevice → “GPU” or with TargetDevice → “CPU”.