ResNet18_ImageNet1K.cntk

# Node: ResNet-18 with ImageNet -- 18 layers plain ResNet for image classification
# Reference: "Deep Residual Learning for Image Recognition" https://arxiv.org/abs/1512.03385

command = TrainNetwork:Eval

precision = "float"; traceLevel = 1; deviceId = "auto"

RootDir = "."
ConfigDir = "$RootDir$"
DataDir = "$RootDir$"
OutputDir = "$RootDir$/Output"
ModelDir = "$OutputDir$/Models"
MeanDir = "$DataDir$"

modelPath = "$ModelDir$/ResNet_18"
stderr = "$OutputDir$/ResNet_18_BS_out"

parallelTrain = true

TrainNetwork = {
    action = "train"

    BrainScriptNetworkBuilder = {
        include "$ConfigDir$/Macros.bs"

        imageShape  = 224:224:3                 # image dimensions
        labelDim    = 1000                      # number of distinct labels

        cMap        = 64:128:256:512
        bnTimeConst = 4096

        model = Sequential(
            # conv1 and max pooling
            ConvBNReLULayer {cMap[0], (7:7), (2:2), bnTimeConst} :
            MaxPoolingLayer {(3:3), stride = 2, pad = true} :
            ResNetBasicStack {2, cMap[0], bnTimeConst} :

            ResNetBasicInc {cMap[1], (2:2), bnTimeConst} :
            ResNetBasic {cMap[1], bnTimeConst} :

            ResNetBasicInc {cMap[2], (2:2), bnTimeConst} :
            ResNetBasic {cMap[2], bnTimeConst} :

            ResNetBasicInc {cMap[3], (2:2), bnTimeConst} :
            ResNetBasicStack {2, cMap[3], bnTimeConst} :

            # avg pooling
            AveragePoolingLayer {(7: 7), stride = 1} :

            # FC
            LinearLayer {labelDim, init = 'normal', initValueScale = 0.01}
        )

        # inputs
        features = Input {imageShape}
        labels   = Input {labelDim}

        # apply model to features
        z        = model (features)

        # loss and error computation
        ce       = CrossEntropyWithSoftmax (labels, z)
        errs     = ClassificationError (labels, z)
        top5Errs = ClassificationError (labels, z, topN = 5)

        # declare special nodes
        featureNodes    = (features)
        labelNodes      = (labels)
        criterionNodes  = (ce)
        evaluationNodes = (errs : top5Errs)
        outputNodes     = (z)
    }

    SGD = {
        epochSize = 0
        minibatchSize = 256
        maxEpochs = 90
        learningRatesPerMB = 1*30: 0.1*30: 0.01*20: 0.001
        momentumPerMB = 0.9
        useNAG = true # use Nesterov Momentum
        gradUpdateType = "None"
        L2RegWeight = 0.0001
        dropoutRate = 0
        numMBsToShowResult = 100

        disableRegInBatchNormalization = true

        ParallelTrain = {
            parallelizationMethod = "DataParallelSGD"
            distributedMBReading = true
            parallelizationStartEpoch = 1
            DataParallelSGD = {
                gradientBits = 32
            }
        }
    }

    reader = {
        readerType = "ImageReader"
        file = "$DataDir$/train_map.txt"
        randomize = "Auto"
        features = {
            width = 224
            height = 224
            channels = 3
            cropType = "RandomArea"
            jitterType = "UniRatio"
            areaRatio = 0.08:1.0
            aspectRatio = 0.75:1.3333
            interpolations = "cubic"
            brightnessRadius = 0.4
            contrastRadius = 0.4
            saturationRadius = 0.4
            hflip = true
            meanFile = "$MeanDir$/ImageNet1K_mean.xml"
        }
        labels = {
            labelDim = 1000
        }
    }

    cvReader = {
        readerType = "ImageReader"
        file = "$DataDir$/val_map.txt"
        randomize = "None"
        features = {
            width = 224
            height = 224
            channels = 3
            cropType = "Center"
            sideRatio = 0.875
            interpolations = "cubic"
            meanFile = "$MeanDir$/ImageNet1K_mean.xml"
        }
        labels = {
            labelDim = 1000
        }
    }
}

Eval = {
    action = "test"
    modelPath = "$modelPath$"
    minibatchSize = 200
    evalNodeNames = errs:top5Errs

    reader={
        readerType = "ImageReader"
        file = "$DataDir$/val_map.txt"
        randomize = "None"
        features = {
            width = 224
            height = 224
            channels = 3
            cropType = "Center"
            sideRatio = 0.875
            interpolations = "cubic"
            meanFile = "$MeanDir$/ImageNet1K_mean.xml"
        }
        labels = {
            labelDim = 1000
        }
    }
}