def test_conv_inverts_deconv(input_size, filter_size, padding, stride):
""" Test that conv and deconv are inverse operations given the same parameters"""
# convolutions whose output size are not an even multiple of stride cannot be exactly inverted
a = (input_size + sum(padding) - filter_size) % stride
conv_output = utils.conv_output_dim(input_size, filter_size, padding,
stride)
deconv_output = utils.deconv_output_dim(conv_output, filter_size, padding,
stride)
assert deconv_output == (input_size - a), (
"Convolution and Deconvolution do not invert:\n"
"output ({}) != input ({}) - a ({})\n"
"filter: {}, padding: {}, stride: {}").format(deconv_output,
input_size, a,
filter_size, padding,
stride)
def __init__(self,
C=1,
N=1,
K=1,
D=1,
H=1,
W=1,
T=1,
R=1,
S=1,
pad_d=0,
pad_h=0,
pad_w=0,
str_d=1,
str_h=1,
str_w=1,
dil_d=1,
dil_h=1,
dil_w=1,
deconv=False):
if deconv:
M = deconv_output_dim(D, T, pad_d, str_d)
P = deconv_output_dim(H, R, pad_h, str_h)
Q = deconv_output_dim(W, S, pad_w, str_w)
else:
M = conv_output_dim(D, T, pad_d, str_d)
P = conv_output_dim(H, R, pad_h, str_h)
Q = conv_output_dim(W, S, pad_w, str_w)
self.dimO = (K, M, P, Q, N)
self.dimI = (C, D, H, W, N)
if deconv:
self.dimF = (K, T, R, S, C)
else:
self.dimF = (C, T, R, S, K)
self.conv_params = dict(pad_d=pad_d,
pad_h=pad_h,
pad_w=pad_w,
str_d=str_d,
str_h=str_h,
str_w=str_w,
dil_d=dil_d,
dil_h=dil_h,
dil_w=dil_w)
batch_axis = ng.make_axis(name='N', length=N)
self.ax_i = ng.make_axes([
ng.make_axis(name='C', length=C),
ng.make_axis(name='D', length=D),
ng.make_axis(name='H', length=H),
ng.make_axis(name='W', length=W), batch_axis
])
if deconv:
self.ax_f = ng.make_axes([
ng.make_axis(name='C', length=K),
ng.make_axis(name='D', length=T),
ng.make_axis(name='H', length=R),
ng.make_axis(name='W', length=S),
ng.make_axis(name='K', length=C),
])
else:
self.ax_f = ng.make_axes([
ng.make_axis(name='C', length=C),
ng.make_axis(name='D', length=T),
ng.make_axis(name='H', length=R),
ng.make_axis(name='W', length=S),
ng.make_axis(name='K', length=K),
])
self.ax_o = ng.make_axes([
ng.make_axis(name='C', length=K),
ng.make_axis(name='D', length=M),
ng.make_axis(name='H', length=P),
ng.make_axis(name='W', length=Q), batch_axis
])