public MobileNetV2(float multiplier = 1, int classes = 1000, string prefix = null, ParameterDict @params = null)
: base(prefix, @params)
{
Features = new HybridSequential("");
MobileNet.AddConv(Features, Convert.ToInt32(32 * multiplier), 3, pad: 1, stride: 2);
for (var i = 0; i < in_channels_group.Length; i++)
{
var in_c = Convert.ToInt32(multiplier * in_channels_group[i]);
var c = Convert.ToInt32(multiplier * channels_group[i]);
var s = strides[i];
var t = ts[i];
Features.Add(new LinearBottleneck(in_c, c, t, s));
}
var last_channel = multiplier > 1 ? Convert.ToInt32(1280 * multiplier) : 1280;
MobileNet.AddConv(Features, last_channel, relu6: true);
Features.Add(new GlobalAvgPool2D());
Output = new HybridSequential("output_");
Output.Add(new Conv2D(classes, (1, 1), use_bias: false, prefix: "pred_"));
Output.Add(new Flatten());
}
public LinearBottleneck(int in_channels, int channels, int t, int stride, string prefix = null,
ParameterDict @params = null) : base(prefix, @params)
{
use_shortcut = stride == 1 && in_channels == channels;
output = new HybridSequential();
MobileNet.AddConv(output, in_channels * t, relu6: true);
MobileNet.AddConv(output, in_channels * t, 3, stride, 1, in_channels, relu6: true);
MobileNet.AddConv(output, channels, active: false, relu6: true);
}
public static MobileNet GetMobileNetV2(float multiplier, bool pretrained = false, Context ctx = null,
string root = "", int classes = 1000, string prefix = null, ParameterDict @params = null)
{
var net = new MobileNet(multiplier, classes, prefix, @params);
if (pretrained)
{
net.LoadParameters(ModelStore.GetModelFile($"mobilenetv2_{multiplier}"), ctx);
}
return(net);
}
public static MobileNet GetMobileNet(float multiplier, bool pretrained = false, Context ctx = null,
string root = "", int classes = 1000, string prefix = "", ParameterDict @params = null)
{
var net = new MobileNet(multiplier, classes, prefix, @params);
var version_suffix = string.Format("{0:0.00}", multiplier);
if (version_suffix == "1.00" || version_suffix == "0.50")
{
version_suffix = version_suffix.Substring(0, 3);
}
if (pretrained)
{
net.LoadParameters(ModelStore.GetModelFile($"mobilenet{version_suffix}"), ctx);
}
return(net);
}