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Fix memory leak in TensorflowTransform #4223

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Merged
merged 3 commits into from
Sep 29, 2019
Merged

Fix memory leak in TensorflowTransform #4223

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aa716ab
Fix memory leak by freeing input tensors after executing the graph
KsenijaS Sep 17, 2019
7a54188
Fix memory leak by freeing the graph after each session
KsenijaS Sep 17, 2019
fcde1c7
Get input tensors from runner
KsenijaS Sep 19, 2019
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5 changes: 5 additions & 0 deletions src/Microsoft.ML.Dnn/DnnUtils.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -399,6 +399,11 @@ public Runner AddInput(Tensor value, int index)
return this;
}

public List<Tensor> GetInputValues()
{
return _inputValues;
}

public Runner AddOutputs(string output)
{
_outputs.Add(ParseOutput(output));
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13 changes: 12 additions & 1 deletion src/Microsoft.ML.TensorFlow/TensorflowTransform.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -463,6 +463,11 @@ private void Dispose(bool disposing)
{
Session.close(); // invoked Dispose()
}

if (Session != null && Session.graph != IntPtr.Zero)
{
Session.graph.Dispose();
}
}
finally
{
Expand Down Expand Up @@ -645,7 +650,7 @@ private void UpdateCacheIfNeeded(long position, ITensorValueGetter[] srcTensorGe
Runner runner = new Runner(_parent.Session);

// Feed inputs to the graph.
for (int i = 0; i < _parent.Inputs.Length; i++)
for (int i = 0; i < _parent.Inputs.Length; i++)
{
var tensor = srcTensorGetters[i].GetTensor();
runner.AddInput(_parent.Inputs[i], tensor);
Expand All @@ -658,6 +663,12 @@ private void UpdateCacheIfNeeded(long position, ITensorValueGetter[] srcTensorGe
// Execute the graph.
var tensors = runner.Run();

List<Tensor> inputTensors = runner.GetInputValues();
foreach (Tensor inputTensor in inputTensors)
{
inputTensor.Dispose();
}

Contracts.Assert(tensors.Length > 0);

for (int j = 0; j < activeOutputColNames.Length; j++)
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