imagine-nn

Universite Paris-Est Marne-la-Vallee IMAGINE/LIGM torch neural network routines

Following modules are here for now:

inn.SpatialStochasticPooling(kW,kH,dW,dH)
inn.SpatialSameResponseNormalization([size = 3], [alpha = 0.00005], [beta = 0.75])
inn.MeanSubtraction(mean)
inn.SpatialPyramidPooling({{w1,h1},{w2,h2},...,{wn,hn}})
inn.ROIPooling(W,H):setSpatialScale(scale)

Look at http://arxiv.org/abs/1301.3557 for inn.SpatialStochasticPooling reference, this is fully working implementation.

inn.ROIPooling is Spatial Adaptive Max Pooling layer for region proposals used in FastRCNN with bugfixes and 50 times faster in backprop. Set v2 = false to use it's old version. inn.ROIPooling expects a table on input, first argument is features in NxDxHxW where N is number of images, second argument is bounding boxes in Bx5 where B is the number of regions to pool and 5 is image id + bbox. Image id is in [1,N] range, boxes are in [x1,y1,x2,y2].

inn.SpatialSameResponseNormalization is a local response normalization in the same map in BDHW format. For details refer to https://code.google.com/p/cuda-convnet/wiki/LayerParams#Local_response_normalization_layer_(same_map)

inn.MeanSubtraction(mean) is done to subtract the Imagenet mean directly on GPU. Mean tensor is expanded to BDHW batches without using additional memory.

inn.SpatialPyramidPooling({{w1,h1},{w2,h2},...,{wn,hn}}) is a pyramid of regions obtained by using Spatial Adaptive Max Pooling with parameters (w1,h1),...,(wn,hn) in the input. The result is a fixed-sized vector of size w1*h1*...wn*hn for any input dimension. For details see http://arxiv.org/abs/1406.4729

OBSOLETE modules

The difference with inn.SpatialMax(Average)Pooling and nn.SpatialMax(Average)Pooling is that output size computed with ceil instead of floor (as in Caffe and cuda-convnet2). Also SpatialAveragePooling does true average pooling, meaning that it divides outputs by kW*kH. inn.SpatialMax(Average)Pooling(kW,kH,dW,dH) is equal to cudnn.SpatialMax(Average)Pooling(kW,kH,dW,dH):ceil().

inn.SpatialCrossResponseNormalization is local response normalization across maps in BDHW format (thanks to Caffe!). For details refer to https://code.google.com/p/cuda-convnet/wiki/LayerParams#Local_response_normalization_layer_(across_maps)

inn.SpatialMaxPooling(kW,kH,dW,dH)
-- OBSOLETE! USE nn.SpatialMaxPooling(kW,kH,dW,dH,padW,padH):ceil()
inn.SpatialAveragePooling(kW,kH,dW,dH)
-- OBSOLETE! USE nn.SpatialAveragePooling(kW,kH,dW,dH,padW,padH):ceil()
inn.SpatialCrossResponseNormalization(size, [alpha = 0.0001], [beta = 0.75], [k = 1])
-- OBSOLETE! USE nn.SpatialCrossMapLRN with the same arguments