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Recreate workspace directory when fit() is called, fix documentation, free up unmanaged memory. #4438

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merged 2 commits into from Nov 4, 2019
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Recreate workspace directory when fit() is called, fix documentation, free up unmanaged memory. #4438

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Recreate workspace directory when fit() is called, fix documentation,…
codemzs Nov 4, 2019
8d43b73
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codemzs Nov 4, 2019
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26 changes: 23 additions & 3 deletions src/Microsoft.ML.Vision/ImageClassificationTrainer.cs
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Expand Up @@ -66,7 +66,8 @@ namespace Microsoft.ML.Vision
///
/// ### Training Algorithm Details
/// Trains a Deep Neural Network(DNN) by leveraging an existing pre-trained model such as Resnet50 for the purpose
/// of classifying images.
/// of classifying images. The technique was inspired from [TensorFlow's retrain image classification tutorial]
/// (https://www.tensorflow.org/hub/tutorials/image_retraining)
/// ]]>
/// </format>
/// </remarks>
Expand Down Expand Up @@ -392,7 +393,7 @@ public sealed class Options : TrainerInputBaseWithLabel
public Action<ImageClassificationMetrics> MetricsCallback = null;

/// <summary>
/// Indicates the path where the models get downloaded to and cache files saved, default is a new temporary directory
/// Indicates the path where the image bottleneck cache files are saved, default is a new temporary directory
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/// </summary>
[Argument(ArgumentType.AtMostOnce, HelpText = "Indicates the path where the models get downloaded to and cache files saved, default is a new temporary directory.", SortOrder = 15)]
public string WorkspacePath = null;
Expand Down Expand Up @@ -591,6 +592,7 @@ private void InitializeTrainingGraph(IDataView input)
_classCount = labelCount == 1 ? 2 : (int)labelCount;
var imageSize = ImagePreprocessingSize[_options.Arch];
_session = LoadTensorFlowSessionFromMetaGraph(Host, _options.Arch).Session;
_session.graph.as_default();
(_jpegData, _resizedImage) = AddJpegDecoding(imageSize.Item1, imageSize.Item2, 3);
_jpegDataTensorName = _jpegData.name;
_resizedImageTensorName = _resizedImage.name;
Expand Down Expand Up @@ -631,6 +633,14 @@ private protected override SchemaShape.Column[] GetOutputColumnsCore(SchemaShape

private protected override ImageClassificationModelParameters TrainModelCore(TrainContext trainContext)
{
// Workspace directory is cleaned after training run. However, the pipeline can be re-used by calling
// fit() again after transform(), in which case we must ensure workspace directory exists. This scenario
// is typical in the case of cross-validation.
if (!Directory.Exists(_options.WorkspacePath))
{
Directory.CreateDirectory(_options.WorkspacePath);
}

InitializeTrainingGraph(trainContext.TrainingSet.Data);
CheckTrainingParameters(_options);
var validationSet = trainContext.ValidationSet?.Data ?? _options.ValidationSet;
Expand Down Expand Up @@ -1301,7 +1311,7 @@ private void VariableSummaries(RefVariable var)
var optimizer = useLearningRateScheduler ? tf.train.GradientDescentOptimizer(_learningRateInput) :
tf.train.GradientDescentOptimizer(learningRate);

_trainStep = optimizer.minimize(crossEntropyMean);
_trainStep = optimizer.minimize(crossEntropyMean);
});

return (_trainStep, crossEntropyMean, _labelTensor, _softMaxTensor);
Expand Down Expand Up @@ -1341,6 +1351,11 @@ private void Dispose(bool disposing)
{
_session.close();
}

if (_session != null && _session.graph != IntPtr.Zero)
{
_session.graph.Dispose();
}
}

/// <summary>
Expand Down Expand Up @@ -1527,6 +1542,11 @@ private void Dispose(bool disposing)
{
_session.close();
}

if (_session != null && _session.graph != IntPtr.Zero)
{
_session.graph.Dispose();
}
}
}
}