def forward(self, inputs):
self.retain_inputs((0, 1))
c_prev, x = inputs
a, i, f, o = _extract_gates(x)
batch = len(x)
if isinstance(x, chainer.get_cpu_array_types()):
if intel64.should_use_ideep('>=auto'):
xp = intel64.ideep.get_array_module(x)
else:
xp = numpy
a = xp.tanh(a)
i = _sigmoid(i, xp)
f = _sigmoid(f, xp)
o = _sigmoid(o, xp)
c_next = numpy.empty_like(c_prev)
c_next[:batch] = a * i + f * c_prev[:batch]
h = o * xp.tanh(c_next[:batch])
else:
c_next = cuda.cupy.empty_like(c_prev)
h = cuda.cupy.empty_like(c_next[:batch])
cuda.elementwise(
'T c_prev, T a, T i_, T f, T o', 'T c, T h',
'''
COMMON_ROUTINE;
c = aa * ai + af * c_prev;
h = ao * tanh(c);
''',
'lstm_fwd', preamble=_preamble)(
c_prev[:batch], a, i, f, o, c_next[:batch], h)
c_next[batch:] = c_prev[batch:]
self.retain_outputs((0,))
return c_next, h
def im2col_gpu(img, kh, kw, sy, sx, ph, pw, cover_all=False, dy=1, dx=1,
out_h=None, out_w=None):
n, c, h, w = img.shape
if out_h is None:
out_h = get_conv_outsize(h, kh, sy, ph, cover_all, dy)
assert out_h > 0, 'Height in the output should be positive.'
if out_w is None:
out_w = get_conv_outsize(w, kw, sx, pw, cover_all, dx)
assert out_w > 0, 'Width in the output should be positive.'
col = cuda.cupy.empty((n, c, kh, kw, out_h, out_w), dtype=img.dtype)
cuda.elementwise(
'raw T img, int32 h, int32 w, int32 out_h, int32 out_w,'
'int32 kh, int32 kw, int32 sy, int32 sx, int32 ph, int32 pw,'
'int32 dy, int32 dx',
'T col',
'''
int c0 = i / (kh * kw * out_h * out_w);
int ky = i / (kw * out_h * out_w) % kh;
int kx = i / (out_h * out_w) % kw;
int out_y = i / out_w % out_h;
int out_x = i % out_w;
int in_y = ky * dy + out_y * sy - ph;
int in_x = kx * dx + out_x * sx - pw;
if (in_y >= 0 && in_y < h && in_x >= 0 && in_x < w) {
col = img[in_x + w * (in_y + h * c0)];
} else {
col = 0;
}
''',
'im2col')(img.reduced_view(),
h, w, out_h, out_w, kh, kw, sy, sx, ph, pw, dy, dx, col)
return col
def forward(self, inputs):
self.retain_inputs((0, 1))
c_prev, x = inputs
a, i, f, o = _extract_gates(x)
batch = len(x)
if isinstance(x, numpy.ndarray):
a = numpy.tanh(a)
i = _sigmoid(i)
f = _sigmoid(f)
o = _sigmoid(o)
c_next = numpy.empty_like(c_prev)
c_next[:batch] = a * i + f * c_prev[:batch]
h = o * numpy.tanh(c_next[:batch])
else:
c_next = cuda.cupy.empty_like(c_prev)
h = cuda.cupy.empty_like(c_next[:batch])
cuda.elementwise(
'T c_prev, T a, T i_, T f, T o', 'T c, T h',
'''
COMMON_ROUTINE;
c = aa * ai + af * c_prev;
h = ao * tanh(c);
''',
'lstm_fwd', preamble=_preamble)(
c_prev[:batch], a, i, f, o, c_next[:batch], h)
c_next[batch:] = c_prev[batch:]
self.retain_outputs((0,))
return c_next, h
def forward_gpu(self, x):
if chainer.should_use_cudnn('>=auto') and 2 <= self.ndim <= 3:
# With cuDNN v3 or greater, use cuDNN implementation for inputs
# with spatial dimensions of two or more.
return super(MaxPoolingND, self).forward_gpu(x)
self._in_shape = x[0].shape
self._in_dtype = x[0].dtype
n, c = x[0].shape[:2]
dims = x[0].shape[2:]
ys = tuple(conv_nd.get_conv_outsize(d, k, s, p, self.cover_all)
for (d, k, s, p) in six.moves.zip(
dims, self.ksize, self.stride, self.pad))
# (n, c, y_1, y_2, ..., y_N)
y_shape = (n, c) + ys
y = cuda.cupy.empty(y_shape, dtype=x[0].dtype)
self.indexes = cuda.cupy.empty(y_shape, dtype=numpy.int32)
in_params, out_params, operation, name = \
max_pooling_nd_kernel.MaxPoolingNDKernelForward.generate(self.ndim)
cuda.elementwise(in_params, out_params, operation, name)(
x[0].reduced_view(),
*(dims + ys + self.ksize + self.stride + self.pad +
(y, self.indexes)))
return y,
def forward_gpu(self, gys):
if self._used_cudnn:
x, = self.apoolnd.get_retained_inputs()
return self.apoolnd.backward_gpu((x.data,), gys)
is_pad_value_none = self.pad_value is None
gy, = gys
n, c = self._in_shape[:2]
idims = self._in_shape[2:]
odims = gy.shape[2:]
if is_pad_value_none:
coeff = self.apoolnd.coeff
# This conversion from chainerx to cupy exists here for
# double backward of chainerx on cuda.
coeff = backend.from_chx(coeff)
gy *= coeff
gx = cuda.cupy.empty(self._in_shape, self._in_dtype)
in_params, out_params, operation, name = \
average_pooling_nd_kernel.AveragePoolingNDKernelBackward.generate(
self.ndim)
cuda.elementwise(in_params, out_params, operation, name)(
gy.reduced_view(),
*(idims + odims + self.ksize + self.stride + self.pad
+ (gx,)))
if not is_pad_value_none:
gx /= functools.reduce(operator.mul, self.ksize)
return gx,
def col2im_gpu(col, sy, sx, ph, pw, h, w, dy=1, dx=1):
n, c, kh, kw, out_h, out_w = col.shape
img = cuda.cupy.empty((n, c, h, w), dtype=col.dtype)
cuda.elementwise(
'raw T col, int32 h, int32 w, int32 out_h, int32 out_w,'
'int32 kh, int32 kw, int32 sy, int32 sx, int32 ph, int32 pw,'
'int32 dx, int32 dy',
'T img',
'''
int c0 = i / (h * w);
int y = i / w % h;
int x = i % w;
T val = 0;
for (int ky = 0; ky < kh; ++ky) {
int out_y = (y + ph - ky * dy);
if (0 > out_y || out_y >= out_h * sy) continue;
if (out_y % sy != 0) continue;
out_y /= sy;
for (int kx = 0; kx < kw; ++kx) {
int out_x = (x + pw - kx * dx);
if (0 > out_x || out_x >= out_w * sx) continue;
if (out_x % sx != 0) continue;
out_x /= sx;
int k = out_y + out_h * (kx + kw * (ky + kh * c0));
val = val + col[out_x + out_w * k];
}
}
img = val;
''',
'col2im')(col.reduced_view(),
h, w, out_h, out_w, kh, kw, sy, sx, ph, pw, dx, dy, img)
return img
def forward_gpu(self, gy):
if self._used_cudnn:
x, = self.apool2d.get_retained_inputs()
return self.apool2d.backward_gpu((x.data,), gy)
n, c, h, w = self._in_shape
y_h, y_w = gy[0].shape[2:]
gx = cuda.cupy.empty(self._in_shape, self._in_dtype)
coeff = 1. / (self.kh * self.kw)
cuda.elementwise(
'raw T gy, int32 h, int32 w,'
'int32 out_h, int32 out_w, int32 kh, int32 kw,'
'int32 sy, int32 sx, int32 ph, int32 pw, T coeff',
'T gx',
'''
int c0 = i / (h * w);
int y = i / w % h + ph;
int x = i % w + pw;
int out_y_0 = max(0, (y - kh + sy) / sy);
int out_y_1 = min(out_h, (y + sy) / sy);
int out_x_0 = max(0, (x - kw + sx) / sx);
int out_x_1 = min(out_w, (x + sx) / sx);
int hc0 = out_h * c0;
T val = 0;
for (int out_y = out_y_0; out_y < out_y_1; ++out_y) {
for (int out_x = out_x_0; out_x < out_x_1; ++out_x) {
val = val + gy[out_x + out_w * (out_y + hc0)];
}
}
gx = val * coeff;
''', 'avg_pool_bwd')(gy[0].reduced_view(),
h, w, y_h, y_w, self.kh, self.kw,
self.sy, self.sx, self.ph, self.pw, coeff,
gx)
return gx,
def forward_gpu(self, inputs):
utils.nondeterministic('atomicAdd')
self.retain_inputs((0, 1, 2))
x, W, gy = inputs
if self.reduce == 'no':
gy = gy[:, None]
samples = self.samples
wx = self.wx.astype(x.dtype, copy=False)
g = cuda.elementwise(
'T wx, T gy, int32 m', 'T g',
'''
T y;
if (i % m == 0) {
y = 1;
} else {
y = -1;
}
g = -y * gy / (1.0f + __expf(wx * y));
''',
'negative_sampling_calculate_g'
)(wx, gy, self.sample_size + 1)
cupy = cuda.cupy
gx = cupy.zeros_like(x)
n_in = x.shape[1]
cuda.elementwise(
'raw T g, raw T W, bool mask, raw S k, int32 c, int32 m', 'T gx',
'''
int d = i / c;
T w = 0;
if (mask == 1){
for (int j = 0; j < m; ++j) {
w += g[d * m + j] * W[k[d * m + j] * c + i % c];
}
}
gx = w;
''',
'negative_sampling_calculate_gx'
)(g, W, self.ignore_mask[:, None], samples, n_in,
self.sample_size + 1, gx)
gW = cupy.zeros_like(W)
cuda.elementwise(
'T g, raw T x, S k, bool mask, int32 c, int32 m',
'raw T gW',
'''
T gi = g;
if (mask == 1) {
for (int j = 0; j < c; ++j) {
atomicAdd(&gW[k * c + j], gi * x[(i / m) * c + j]);
}
}
''',
'negative_sampling_calculate_gw'
)(g, x, samples, self.ignore_mask[:, None], n_in,
self.sample_size + 1, gW)
return gx, None, gW
def forward_gpu(self, inputs):
if self._used_cudnn:
x, = self.mpoolnd._cudnn_inputs
return self._forward_gpu_compute_indexes_again((x, inputs[0]))
x, = inputs
self._in_shape = x.shape
self._in_dtype = x.dtype
n, c = x.shape[:2]
dims = x.shape[2:]
ys = tuple(conv_nd.get_conv_outsize(d, k, s, p, self.cover_all)
for (d, k, s, p) in six.moves.zip(
dims, self.ksize, self.stride, self.pad))
# (n, c, y_1, y_2, ..., y_N)
y_shape = (n, c) + ys
y = cuda.cupy.empty(y_shape, dtype=x.dtype)
cls = max_pooling_nd_kernel.MaxPoolingNDKernelForwardWithIndexes
in_params, out_params, operation, name = cls.generate(self.ndim)
cuda.elementwise(in_params, out_params, operation, name)(
x.reduced_view(),
*(dims + ys + self.ksize + self.stride + self.pad +
(self.indexes.reduced_view(), y)))
return y,
def forward_cudnn(self, inputs):
if self.eps < libcudnn.CUDNN_BN_MIN_EPSILON:
raise RuntimeError(
'cuDNN does not allow an eps value '
'less than {}.'.format(libcudnn.CUDNN_BN_MIN_EPSILON))
self.retain_inputs((0, 1))
x, gamma, beta = inputs
xp = cuda.cupy
orig_shape = x.shape
batch_size, channels = orig_shape[:2]
groups = self.groups
cudnn_shape = (1, batch_size * groups, -1, 1)
x = x.reshape(cudnn_shape)
with cuda.get_device_from_array(x):
dummy_beta = xp.zeros(batch_size * groups, dtype=x.dtype)
self.dummy_gamma = xp.ones_like(dummy_beta)
x_hat, self.mean, self.inv_std = \
cudnn.batch_normalization_forward_training(
x, self.dummy_gamma, dummy_beta, dummy_beta, dummy_beta, None,
None, self.eps, 1.0, True, libcudnn.CUDNN_BATCHNORM_SPATIAL,
configuration.config.debug)
y = x_hat.reshape((batch_size, channels, -1))
cuda.elementwise(
'T gamma, T beta', 'T y',
'y = y * gamma + beta',
'groupnorm_y')(gamma[:, None], beta[:, None], y)
y = y.reshape(orig_shape)
return y,
def forward_gpu(self, gys):
if self._used_cudnn:
x, = self.apoolnd.get_retained_inputs()
return self.apoolnd.backward_gpu((x.data,), gys)
gy, = gys
n, c = self._in_shape[:2]
idims = self._in_shape[2:]
odims = gy.shape[2:]
gx = cuda.cupy.empty(self._in_shape, self._in_dtype)
if self.pad_value is None:
coeff = self._get_pooling_width(cuda.cupy, odims, gy.dtype)
coeff = cuda.cupy.reciprocal(coeff, out=coeff)
else:
coeff = 1. / functools.reduce(operator.mul, self.ksize)
in_params, out_params, operation, name = \
average_pooling_nd_kernel.AveragePoolingNDKernelBackward.generate(
self.ndim)
cuda.elementwise(in_params, out_params, operation, name)(
gy.reduced_view(),
*(idims + odims + self.ksize + self.stride + self.pad
+ (coeff, gx)))
return gx,
def update_core_gpu(self, param):
grad = param.grad
if grad is None:
return
cuda.elementwise('T grad, T lr', 'T param',
'param -= lr * grad',
'sgd')(grad, self.hyperparam.lr, param.data)
def label_probability(self, label_size, path, path_length,
multiply_seq, xp):
seq_length = len(multiply_seq)
n_batch = len(path)
dtype = multiply_seq.dtype
ret = xp.zeros((seq_length, n_batch, label_size), dtype)
if xp == numpy:
for b in six.moves.range(len(path)):
target_path = path[b, :path_length[b]]
chars = {c for c in target_path}
for c in chars:
ret[:, b, c] = xp.sum(
multiply_seq[:, b, 0:path_length[b]]
[:, target_path == c], axis=1)
else:
cuda.elementwise(
'T prob, I path, I path_length, I max_path_length',
'raw T cum_prob',
'''
I t = i % max_path_length;
if (t < path_length) {
int n_batch = cum_prob.shape()[1];
I s = i / (max_path_length * n_batch);
I b = (i - s * (max_path_length * n_batch))
/ max_path_length;
int ind[] = {s, b, path};
atomicAdd(&cum_prob[ind], prob);
}
''', 'ctc_label_prob_sum'
)(multiply_seq, path, path_length[:, None], path.shape[1], ret)
return ret
def forward_gpu(self, inputs):
if self._used_cudnn:
x, = self.mpool2d.get_retained_inputs()
return self._forward_gpu_compute_indexes_again((x.data, inputs[0]))
else:
x, = inputs
n, c, h, w = x.shape
y_h = conv.get_conv_outsize(
h, self.kh, self.sy, self.ph, self.cover_all)
assert y_h > 0, 'Height in the output should be positive.'
y_w = conv.get_conv_outsize(
w, self.kw, self.sx, self.pw, self.cover_all)
assert y_w > 0, 'Width in the output should be positive.'
y = cuda.cupy.empty((n, c, y_h, y_w), dtype=x.dtype)
cuda.elementwise(
'raw T in, raw S indexes, int32 h, int32 w, int32 out_h,'
'int32 out_w, int32 kh, int32 kw, int32 sy, int32 sx,'
'int32 ph, int32 pw', 'T out',
'''
int c0 = i / (out_h * out_w);
int out_y = i / out_w % out_h;
int out_x = i % out_w;
int index = indexes[i];
int max_y = max(0, out_y * sy - ph + index / kw);
int max_x = max(0, out_x * sx - pw + index % kw);
out = in[max_x + w * (max_y + h * c0)];
''', 'max_pool_grad_fwd')(
x.reduced_view(), self.indexes.reduced_view(), h, w,
y_h, y_w, self.kh, self.kw, self.sy, self.sx, self.ph,
self.pw, y)
return y,
def forward(self, inputs):
xp = backend.get_array_module(*inputs)
c_prev, x, c_next, gc, gh = inputs
batch = len(x)
gx = xp.empty_like(x)
ga, gi, gf, go = _extract_gates(gx)
# Consider the case that either gradient is not given
if gc is None:
gc_update = 0
gc_rest = 0
else:
gc_update = gc[:batch]
gc_rest = gc[batch:]
if gh is None:
gh = 0
a, i, f, o = _extract_gates(x)
if xp is numpy:
if intel64.should_use_ideep('>=auto'):
xp = intel64.ideep.get_array_module(x)
tanh_a = xp.tanh(a)
sig_i = _sigmoid(i, xp)
sig_f = _sigmoid(f, xp)
sig_o = _sigmoid(o, xp)
co = xp.tanh(c_next[:batch])
gc_prev = numpy.empty_like(c_prev)
# multiply f later
gc_prev[:batch] = gh * sig_o * _grad_tanh(co) + gc_update
gc = gc_prev[:batch]
ga[:] = gc * sig_i * _grad_tanh(tanh_a)
gi[:] = gc * tanh_a * _grad_sigmoid(sig_i)
gf[:] = gc * c_prev[:batch] * _grad_sigmoid(sig_f)
go[:] = gh * co * _grad_sigmoid(sig_o)
gc_prev[:batch] *= sig_f # multiply f here
gc_prev[batch:] = gc_rest
else:
gc_prev = xp.empty_like(c_prev)
cuda.elementwise(
'T c_prev, T c, T gc, T gh, T a, T i_, T f, T o',
'T gc_prev, T ga, T gi, T gf, T go',
'''
COMMON_ROUTINE;
T co = tanh(c);
T temp = gh * ao * grad_tanh(co) + gc;
ga = temp * ai * grad_tanh(aa);
gi = temp * aa * grad_sigmoid(ai);
gf = temp * c_prev * grad_sigmoid(af);
go = gh * co * grad_sigmoid(ao);
gc_prev = temp * af;
''',
'lstm_bwd', preamble=_preamble)(
c_prev[:batch], c_next[:batch], gc_update, gh, a, i, f, o,
gc_prev[:batch], ga, gi, gf, go)
gc_prev[batch:] = gc_rest
return gc_prev, gx
def _transpose(xs, length):
if length == 0:
return ()
xp = backend.get_array_module(*xs)
lengths = numpy.empty(length, dtype=numpy.int32)
end = length
for i, x in enumerate(xs):
len_x = len(x)
if len_x == end:
continue
lengths[len_x:end] = i
end = len_x
lengths[0:end] = len(xs)
if xp is numpy:
dtype = xs[0].dtype
unit = xs[0].shape[1:]
outs = tuple([xp.empty((l,) + unit, dtype=dtype) for l in lengths])
for i, x in enumerate(xs):
for p, xi in enumerate(x):
outs[p][i] = xi
else:
offsets1 = numpy.empty(len(xs) + 1, dtype=numpy.int32)
offsets1[0] = 0
numpy.cumsum([len(x) for x in xs], out=offsets1[1:])
offsets2 = numpy.empty(length + 1, dtype=numpy.int32)
offsets2[0] = 0
numpy.cumsum(lengths, dtype=numpy.int32, out=offsets2[1:])
x = xp.concatenate(xs, axis=0)
o = xp.empty_like(x)
unit = xs[0].size // len(xs[0])
size = length * len(xs) * unit
cuda.elementwise(
'int32 len, int32 unit, raw int32 off1, raw int32 off2, raw T vs',
'raw T hs',
'''
int ind = i / unit;
int off = i - ind * unit;
int y = ind / len;
int x = ind - y * len;
if (off2[x] + y < off2[x + 1]) {
hs[(off2[x] + y) * unit + off] = vs[(off1[y] + x) * unit + off];
}
''',
'transpose_sequence'
)(length, unit, cuda.to_gpu(offsets1), cuda.to_gpu(offsets2), x, o,
size=size)
outs = tuple(xp.split(o, offsets2[1:-1]))
return outs
def _computes_transition(
self, prev_prob, path, path_length, cum_prob, y):
xp = cuda.get_array_module(prev_prob)
if xp == numpy:
n_batch, max_path_length = path.shape
mat = xp.full(
(3, n_batch, max_path_length), self.zero_padding, 'f')
mat[0, :, :] = prev_prob
mat[1, :, 1:] = prev_prob[:, :-1]
mat[2, :, 2:] = prev_prob[:, :-2]
# disable transition between the same symbols
# (including blank-to-blank)
same_transition = (path[:, :-2] == path[:, 2:])
mat[2, :, 2:][same_transition] = self.zero_padding
prob = _logsumexp(mat, xp, axis=0)
outside = xp.arange(max_path_length) >= path_length[:, None]
prob[outside] = self.zero_padding
cum_prob += prob
batch_index = xp.arange(n_batch, dtype='i')
prob += y[batch_index[:, None], path]
else:
prob = xp.empty_like(prev_prob)
cuda.elementwise(
'raw T prob, raw I path, I path_length, T zero, raw T y',
'T z, T cum_prob',
'''
int length = prob.shape()[1];
int b = i / length;
int t = i - b * length;
if (t >= path_length) {
z = zero;
cum_prob += zero;
return;
}
int ind1[] = {b, t};
int ind2[] = {b, t - 1};
int ind3[] = {b, t - 2};
float f1 = prob[ind1];
float f2 = (0 <= t - 1) ? prob[ind2] : zero;
float f3 = (0 <= t - 2 && path[ind3] != path[ind1]) ?
prob[ind3] : zero;
// calculates log-sum-exp
float m = max(f1, max(f2, f3));
z = m + log(exp(f1 - m) + exp(f2 - m) + exp(f3 - m));
cum_prob += z;
int y_ind[] = {b, path[ind1]};
z += y[y_ind];
''', 'ctc_transition'
)(prev_prob, path, path_length[:, None], self.zero_padding, y,
prob, cum_prob)
return prob
def forward_gpu(self, x):
if chainer.should_use_cudnn('>=auto'):
self.retain_inputs((0,))
return super(MaxPooling2D, self).forward_gpu(x)
self._in_shape = x[0].shape
self._in_dtype = x[0].dtype
n, c, h, w = x[0].shape
y_h = conv.get_conv_outsize(
h, self.kh, self.sy, self.ph, self.cover_all)
assert y_h > 0, 'Height in the output should be positive.'
y_w = conv.get_conv_outsize(
w, self.kw, self.sx, self.pw, self.cover_all)
assert y_w > 0, 'Width in the output should be positive.'
y = cuda.cupy.empty((n, c, y_h, y_w), dtype=x[0].dtype)
self.indexes = cuda.cupy.empty((n, c, y_h, y_w), dtype=numpy.int32)
cuda.elementwise(
'raw T in, int32 h, int32 w, int32 out_h, int32 out_w,'
'int32 kh, int32 kw, int32 sy, int32 sx, int32 ph, int32 pw',
'T out, S indexes',
'''
int c0 = i / (out_h * out_w);
int out_y = i / out_w % out_h;
int out_x = i % out_w;
int in_y_0 = max(0, out_y * sy - ph);
int in_y_1 = min(h, out_y * sy + kh - ph);
int in_x_0 = max(0, out_x * sx - pw);
int in_x_1 = min(w, out_x * sx + kw - pw);
T maxval = in[in_x_0 + w * (in_y_0 + h * c0)];
int argmax_y = in_y_0;
int argmax_x = in_x_0;
for (int y = in_y_0; y < in_y_1; ++y) {
int offset_y = w * (y + h * c0);
for (int x = in_x_0; x < in_x_1; ++x) {
float v = in[x + offset_y];
if (maxval < v) {
maxval = v;
argmax_y = y;
argmax_x = x;
}
}
}
out = maxval;
int argmax_ky = argmax_y + ph - out_y * sy;
int argmax_kx = argmax_x + pw - out_x * sx;
indexes = argmax_kx + kw * argmax_ky;
''', 'max_pool_fwd')(x[0].reduced_view(),
h, w, y_h, y_w, self.kh, self.kw,
self.sy, self.sx, self.ph, self.pw,
y, self.indexes)
return y,
def forward_gpu(self, inputs_and_grad_outputs):
class_weight = cuda.to_gpu(self.class_weight)
cupy = cuda.cupy
x, t, gloss = inputs_and_grad_outputs
if x.size == 0:
return cupy.zeros(x.shape, dtype=x.dtype), None
if self.y is not None:
y = self.y
else:
y = log_softmax._log_softmax(x)
cupy.exp(y, out=y)
n_unit = t.size // len(t)
if self.coeff is not None:
coeff = self.coeff
else:
gloss = gloss[:, None, ...]
coeff = cupy.array(1, dtype=gloss.dtype) # dtype does not matter
if self.class_weight is None:
gx = cuda.elementwise(
'T y, S t, T gloss, U coeff, S n_channel, S n_unit, '
'S ignore_label',
'T gx',
'''
const int c = (i / n_unit % n_channel);
if (t == ignore_label) {
gx = T(0);
} else {
gx = static_cast<T>(gloss * coeff * (y - (c == t)));
}
''',
'softmax_crossent_bwd')(
y, cupy.expand_dims(t, 1), gloss, coeff, x.shape[1],
n_unit, self.ignore_label)
else:
gx = cuda.elementwise(
'T y, raw T w, S t, T gloss, U coeff, '
'S n_channel, S n_unit, S ignore_label',
'T gx',
'''
const int c = (i / n_unit % n_channel);
if (t == ignore_label) {
gx = T(0);
} else {
gx = static_cast<T>(
gloss * coeff * (y - (c == t)) * w[t]);
}
''',
'softmax_crossent_weight_bwd')(
y, class_weight, cupy.expand_dims(t, 1), gloss, coeff,
x.shape[1], n_unit, self.ignore_label)
return gx,
def forward_gpu(self, inputs):
gy, = inputs
x1, x2 = self.x1, self.x2
gx1 = cuda.elementwise(
'T x1, T x2, T gy', 'T gx1',
'gx1 = (x1 <= x2) ? gy : (T)0.0',
'minimum_bwd1')(x1, x2, gy)
gx2 = cuda.elementwise(
'T x1, T x2, T gy', 'T gx1',
'gx1 = (x1 > x2) ? gy : (T)0.0',
'minimum_bwd2')(x1, x2, gy)
return utils.sum_to(gx1, x1.shape), utils.sum_to(gx2, x2.shape)
def update_core_gpu(self, param):
grad = param.grad
if grad is None:
return
cuda.elementwise(
'T grad, T lr, T momentum',
'T param, T v',
'''v = momentum * v - lr * grad;
param += v;''',
'momentum_sgd')(
grad, self.hyperparam.lr, self.hyperparam.momentum,
param.data, self.state['v'])
def forward_gpu(self, x):
self.y = cuda.cupy.square(x[0]) # temporary
self.scale = cuda.cupy.empty_like(self.y)
_cu_conv_sum(self.scale, self.y, self.n)
cuda.elementwise(
'T x, T k, T alpha, T beta',
'T y, T scale',
'''scale = k + alpha * scale;
y = x * pow(scale, -beta);''',
'lrn_fwd')(x[0], self.k, self.alpha, self.beta,
self.y, self.scale)
return self.y,
def _inverse_indices(indices):
xp = cuda.get_array_module(indices)
r = xp.empty_like(indices)
if xp is numpy:
r[indices] = numpy.arange(len(indices))
else:
cuda.elementwise(
'S ind', 'raw S r',
'r[ind] = i',
'inverse_indices'
)(indices, r)
return r
def forward_gpu(self, inputs):
self.retain_inputs((0, 1, 2))
x, t, W = inputs
self.ignore_mask = (t != self.ignore_label)
samples = self._make_samples(t)
n_in = x.shape[1]
self.wx = cuda.elementwise(
'raw T W, raw T x, bool mask, S k, int32 c, int32 m', 'T wx',
'''
T f = 0;
if (mask == 1) {
for (int j = 0; j < c; ++j) {
int x_ind[] = {(i / m), j};
int w_ind[] = {k, j};
f += x[x_ind] * W[w_ind];
}
}
wx = f;
''',
'negative_sampling_wx'
)(W, x, self.ignore_mask[:, None], samples, n_in,
self.sample_size + 1)
loss = cuda.elementwise(
'T wx, int32 c, int32 m, bool mask', 'T y',
'''
if (mask) {
T f = wx;
if (i % m == 0) {
f = -f;
}
if (f < 0) {
y = __logf(1 + __expf(f));
} else {
y = f + __logf(1 + __expf(-f));
}
} else {
y = 0;
}
''',
'negative_sampling_forward'
)(self.wx, n_in, self.sample_size + 1, self.ignore_mask[:, None])
if self.reduce == 'sum':
loss = loss.sum()
else: # 'no':
loss = loss.sum(axis=1)
self.samples = samples
return loss,
def backward_gpu(self, x, gy):
summand = cuda.elementwise(
'T scale, T y, T gy', 'T summand',
'summand = y * gy / scale',
'lrn_bwd_summand')(self.scale, self.y, gy[0])
gx = cuda.cupy.empty_like(x[0])
_cu_conv_sum(gx, summand, self.n)
cuda.elementwise(
' T x, T gy, T scale, T beta, T coeff', 'T gx',
'gx = pow(scale, -beta) * gy - coeff * x * gx',
'lrn_bwd')(x[0], gy[0], self.scale,
self.beta, 2 * self.alpha * self.beta, gx)
return gx,
def forward_gpu(self, inputs):
x, y, gy = inputs
summand = cuda.elementwise(
'T scale, T y, T gy', 'T summand',
'summand = y * gy / scale',
'lrn_bwd_summand')(self.scale, y, gy)
gx = cuda.cupy.empty_like(x)
_cu_conv_sum(gx, summand, self.n)
cuda.elementwise(
' T x, T gy, T scale, T beta, T coeff', 'T gx',
'gx = pow(scale, -beta) * gy - coeff * x * gx',
'lrn_bwd')(x, gy, self.scale,
self.beta, 2 * self.alpha * self.beta, gx)
return gx,
def update_core_gpu(self, param):
grad = param.grad
if grad is None:
return
cuda.elementwise(
'T grad, T one_minus_rho, T eps',
'T param, T msg, T msdx',
'''msg = msg + one_minus_rho * (grad * grad - msg);
T dx = sqrt((msdx + eps) / (msg + eps)) * grad;
msdx += one_minus_rho * (dx * dx - msdx);
param -= dx;''',
'adadelta')(grad, 1 - self.hyperparam.rho,
self.hyperparam.eps, param.data,
self.state['msg'], self.state['msdx'])
def update_core_gpu(self, param):
grad = param.grad
if grad is None:
return
cuda.elementwise(
'T grad, T lr, T momentum',
'T param, T v',
'''
v = v * momentum - lr * grad;
param += momentum * momentum * v - (1 + momentum) * lr * grad;
''',
'nesterov_ag')(
grad, self.hyperparam.lr, self.hyperparam.momentum,
param.data, self.state['v'])
def backward(self, inputs, grad_outputs):
x, gamma, _ = inputs
gy = grad_outputs[0]
head_ndim = gamma.ndim + 1
expander = (None, Ellipsis) + (None,) * (x.ndim - head_ndim)
m = gamma.dtype.type(x.size // gamma.size)
axis = (0,) + tuple(range(head_ndim, x.ndim))
xp = backend.get_array_module(x)
# Note: we must be in train mode.
assert configuration.config.train
# NOTE(tommi): cuDNN is not used since it does not support
# batch renormalization
gbeta = gy.sum(axis=axis)
ggamma = (gy * self.x_hat_renorm).sum(axis=axis)
gsigma_batch = (gy * self.x_hat).sum(axis=axis)
if xp is numpy:
scale = (self.r * gamma / self.std)[expander]
gx = scale * (gy - (self.x_hat * gsigma_batch[expander] +
gbeta[expander]) / m)
else:
inv_m = numpy.float32(1) / m
gx = cuda.elementwise(
'T gy, T x_hat, T gamma, T std, T gsigma_batch, T gbeta, \
T inv_m, T r',
'T gx',
'gx = (r * gamma / std) * (gy - (x_hat * gsigma_batch + gbeta) * \
inv_m)',
'bn_bwd')(gy, self.x_hat, gamma[expander],
self.std[expander], gsigma_batch[expander],
gbeta[expander], inv_m, self.r[expander])
return gx, ggamma, gbeta
def forward_gpu(self, x):
self.retain_inputs((0,))
return cuda.elementwise(
'T x', 'T y',
'y = erfc(x)',
'elementwise_erfc',
)(x[0]),
def forward_gpu(self, inputs):
self.retain_inputs((0, 1))
x, gy = inputs
# TODO(beam2d): Make it not use the input
value = _preprocess_const(x, self.value)
gx = cuda.elementwise('T x, T gy, T value', 'T gx',
'gx = -value * gy / (x * x)',
'div_from_const_bwd')(x, gy, value)
return gx,
def forward_gpu(self, inputs):
self.retain_inputs((0, 1, 2))
p, x, y = inputs
return cuda.elementwise(
'T p, T x, T y',
'T z',
'z = p * x + (1 - p) * y',
'linear_interpolate_fwd',
)(p, x, y),
def forward(self, inputs):
xp = backend.get_array_module(*inputs)
x, gamma, beta = inputs
# Note: we must be in train mode.
assert configuration.config.train
head_ndim = gamma.ndim + 1
expander = (None, Ellipsis) + (None, ) * (x.ndim - head_ndim)
# NOTE(tommi): cuDNN is not used since it does not support
# batch renormalization
axis = (0, ) + tuple(range(head_ndim, x.ndim))
mean = x.mean(axis=axis, dtype=gamma.dtype)
var = x.var(axis=axis, dtype=gamma.dtype)
self.std = xp.sqrt(var + self.eps, dtype=var.dtype)
running_sigma = xp.sqrt(self._running_var + self.eps,
dtype=self._running_mean.dtype)
self.r = xp.clip(self.std / running_sigma, 1.0 / self.rmax, self.rmax)
d = xp.clip((mean - self._running_mean) / running_sigma, -self.dmax,
self.dmax)
gamma = gamma[expander]
beta = beta[expander]
if xp is numpy:
self.x_hat = _xhat(x, mean, self.std, expander)
self.x_hat_renorm = self.x_hat * self.r[expander] + d[expander]
y = gamma * self.x_hat_renorm
y += beta
y = y.astype(dtype=x.dtype)
else:
self.x_hat, self.x_hat_renorm, y = cuda.elementwise(
'T x, U mean, U std, U gamma, U beta, U r, U d',
'U x_hat, U x_hat_renorm, T y', '''
x_hat = (x - mean) / std;
x_hat_renorm = x_hat * r + d;
y = gamma * x_hat_renorm + beta;
''', 'brn_fwd')(x, mean[expander], self.std[expander], gamma,
beta, self.r[expander], d[expander])
if self.update_statistics:
m = x.size // gamma[expander].size
self._running_mean *= self.decay
adjust = m / max(m - 1., 1.) # unbiased estimation
temp_ar = xp.array(mean)
temp_ar *= (1 - self.decay)
self._running_mean += temp_ar
del temp_ar
self._running_var *= self.decay
temp_ar = xp.array(var)
temp_ar *= (1 - self.decay) * adjust
self._running_var += temp_ar
del temp_ar
return y,
def forward_gpu(self, x):
self.retain_inputs((0, ))
self.retain_outputs((0, ))
return cuda.elementwise(
'T x',
'T y',
'y = erfcx(x)',
'elementwise_erfcx',
)(x[0]),
def forward_gpu(self, inputs):
self.retain_inputs((0, 1, 2, 3))
p, x, y, gz = inputs
return cuda.elementwise(
'T p, T x, T y, T gz', 'T gp, T gx, T gy', '''
gp = (x - y) * gz;
gx = gz * p;
gy = gz * (1 - p);
''', 'linear_interpolate_bwd')(p, x, y, gz)
def forward_gpu(self, inputs):
self.retain_inputs((0, 1))
y, gy = inputs
value = _preprocess_const(y, self.value)
gx = cuda.elementwise('T y, T gy, T value', 'T gx',
'gx = log(value) * y * gy',
'pow_const_var_bwd')(y, gy, value)
return gx,
def forward_gpu(self, inputs):
self.retain_inputs((0, 1))
x, gy = inputs
self.val = _preprocess_const(x, self.value)
gx = cuda.elementwise('T x, T gy, T value', 'T gx',
'gx = value * pow(x, value - 1) * gy',
'pow_var_const_bwd')(x, gy, self.val)
return gx,
def forward_gpu(self, inputs):
self.retain_inputs((0, 1, 2))
x1, x2, gy = inputs
gx1, gx2 = cuda.elementwise('T x1, T x2, T gy', 'T gx1, T gx2',
('T sqnorm = x1 * x1 + x2 * x2;'
'gx1 = x2 / sqnorm * gy;'
'gx2 = -x1 / sqnorm * gy;'),
'arctan2_bwd')(x1, x2, gy)
return gx1, gx2
def entropy_gpu(x):
vec = cuda.elementwise(
'T x',
'T y',
'''
y = (x == 0) ? 0 : -x*log(x);
''',
'entropy')(x.data)
return cuda.cupy.sum(vec, 1)
def log_matrix(self, x, xp):
if xp == numpy:
res = numpy.ma.log(x).filled(fill_value=self.zero_padding)
else:
create_recurrence_relation = cuda.elementwise(
'T x, T e', 'T y', 'y = x == 0 ? e : log(x)',
'create_recurrence_relation')
res = create_recurrence_relation(x, self.zero_padding)
return res.astype(numpy.float32)
def forward_gpu(self, inputs):
self.retain_inputs((0, ))
x = inputs[0]
y = cuda.elementwise(
'T x, T beta, T beta_inv', 'T y', '''
T bx = beta * x;
y = (max(bx, (T)0) + log1p(exp(-fabs(bx)))) * beta_inv;
''', 'softplus_fwd')(x, self.beta, self.beta_inv)
return y,
def forward_gpu(self, inputs):
self.retain_inputs((0, 1, 2))
x0, x1, gy = inputs
gx0, gx1 = cuda.elementwise(
'T x0, T x1, T gy', 'T gx0, T gx1', '''
gx0 = gy / x1;
gx1 = -gx0 * x0 / x1;
''', 'div_bwd')(x0, x1, gy)
return utils.sum_to(gx0, x0.shape), utils.sum_to(gx1, x1.shape)
def forward_gpu(self, inputs):
self.retain_inputs((0, ))
x, = inputs
x_hat = cuda.elementwise('T x, T mean, T inv_std', 'T x_hat',
'x_hat = (x - mean) * inv_std',
'groupnorm_x_hat')(x, self.mean[:, None],
self.inv_std[:, None])
self.retain_outputs((0, ))
return x_hat,
def update_core_gpu(self, param):
grad = param.grad
if grad is None:
return
hp = self.hyperparam
eps = grad.dtype.type(hp.eps)
if hp.eps != 0 and eps == 0:
raise ValueError(
'eps of Adam optimizer is too small for {} ({})'.format(
grad.dtype.name, hp.eps))
if hp.amsgrad:
if AdamRule._amsgrad_kernel is None:
AdamRule._amsgrad_kernel = cuda.elementwise(
'T grad, T alpha_t, T one_minus_beta1, T one_minus_beta2, '
'T eps, T eta, T weight_decay_rate',
'T param, T m, T v, T vhat',
'''m += one_minus_beta1 * (grad - m);
v += one_minus_beta2 * (grad * grad - v);
vhat = max(vhat, v);
param -= eta * (alpha_t * m / (sqrt(vhat) + eps) +
weight_decay_rate * param);''',
'adam')
AdamRule._amsgrad_kernel(
grad, self.alpha_t, 1 - hp.beta1,
1 - hp.beta2, hp.eps,
hp.eta, hp.weight_decay_rate,
param.data, self.state['m'], self.state['v'],
self.state['vhat'])
else:
if AdamRule._kernel is None:
AdamRule._kernel = cuda.elementwise(
'T grad, T alpha_t, T one_minus_beta1, T one_minus_beta2, '
'T eps, T eta, T weight_decay_rate',
'T param, T m, T v',
'''m += one_minus_beta1 * (grad - m);
v += one_minus_beta2 * (grad * grad - v);
param -= eta * (alpha_t * m / (sqrt(v) + eps) +
weight_decay_rate * param);''',
'adam')
AdamRule._kernel(grad, self.alpha_t, 1 - hp.beta1,
1 - hp.beta2, hp.eps,
hp.eta, hp.weight_decay_rate,
param.data, self.state['m'], self.state['v'])
def forward(self, xs):
xp = backend.get_array_module(*xs)
if self.length is None:
length = max(len(x) for x in xs)
else:
length = self.length
shape = (len(xs), length) + xs[0].shape[1:]
y = xp.empty(shape, xs[0].dtype)
if length == 0:
return y, # y is an empty array
if xp is numpy or any(not x._c_contiguous for x in xs):
for i, x in enumerate(xs):
l = len(x)
if l == length:
y[i] = x
else:
y[i, 0:l] = x
y[i, l:] = self.padding
else:
# This code assumes that all arrays are c_contiguous
ptr_shape = (Ellipsis,) + (None,) * xs[0].ndim
ptrs = cuda.cupy.array(
[x.data for x in xs], numpy.uintp)[ptr_shape]
lengths = cuda.cupy.array(
[len(x) for x in xs], numpy.int32)[ptr_shape]
base = utils.size_of_shape(xs[0].shape[1:])
cuda.elementwise(
'P ptr, int32 length, T pad, int32 base, int32 max_length',
'T y',
'''
int d = i / base % max_length;
if (d < length) {
y = reinterpret_cast<const T*>(ptr)[i % (base * max_length)];
} else {
y = pad;
}
''',
'pad_sequence_fwd'
)(ptrs, lengths, self.padding, base, length, y)
return y,
def forward_gpu(self, inputs):
x, t, W = inputs
self.ignore_mask = (t != self.ignore_label)
n_in = x.shape[1]
self._make_samples(t)
self.wx = cuda.elementwise(
'raw T W, raw T x, bool mask, S k, int32 c, int32 m', 'T wx', '''
T f = 0;
if (mask == 1) {
for (int j = 0; j < c; ++j) {
int x_ind[] = {(i / m), j};
int w_ind[] = {k, j};
f += x[x_ind] * W[w_ind];
}
}
wx = f;
''',
'negative_sampling_wx')(W, x, self.ignore_mask[:, None],
self.samples, n_in, self.sample_size + 1)
loss = cuda.elementwise(
'T wx, int32 c, int32 m, bool mask', 'T y', '''
if (mask) {
T f = wx;
if (i % m == 0) {
f = -f;
}
if (f < 0) {
y = __logf(1 + __expf(f));
} else {
y = f + __logf(1 + __expf(-f));
}
} else {
y = 0;
}
''',
'negative_sampling_forward')(self.wx, n_in, self.sample_size + 1,
self.ignore_mask[:, None])
if self.reduce == 'sum':
loss = loss.sum()
else: # 'no':
loss = loss.sum(axis=1)
return loss,
def forward_gpu(self, inputs):
gy, = inputs
gx1, gx2 = cuda.elementwise(
'S cond, T gy', 'T gx1, T gx2',
'''
gx1 = cond ? gy : (T)0.0;
gx2 = cond ? (T)0.0 : gy;
''',
'maximum_bwd1')(self.cond, gy)
return gx1, gx2
def forward_gpu(self, inputs):
self.retain_inputs((0, 1, 2))
x0, x1, gy = inputs
gx0, gx1 = cuda.elementwise(
'T x0, T x1, T gy, T y', 'T gx0, T gx1', '''
gx0 = x1 * pow(x0, x1 - 1) * gy;
gx1 = log(x0) * y * gy;
''', 'pow_var_var_bwd')(x0, x1, gy, self.y)
return gx0, gx1
def update_core_gpu(self, param):
grad = param.grad
if grad is None:
return
if AdaGradRule._kernel is None:
AdaGradRule._kernel = cuda.elementwise(
'T grad, T lr, T eps', 'T param, T h', '''h += grad * grad;
param -= lr * grad / (sqrt(h) + eps);''', 'adagrad')
AdaGradRule._kernel(grad, self.hyperparam.lr, self.hyperparam.eps,
param.data, self.state['h'])
def forward_gpu(self, gy):
if self._used_cudnn:
x, = self.apoolnd.get_retained_inputs()
return self.apoolnd.backward_gpu((x.data, ), gy)
n, c = self._in_shape[:2]
dims = self._in_shape[2:]
ys = gy[0].shape[2:]
gx = cuda.cupy.empty(self._in_shape, self._in_dtype)
coeff = 1. / functools.reduce(operator.mul, self.ksize)
in_params, out_params, operation, name = \
average_pooling_nd_kernel.AveragePoolingNDKernelBackward.generate(
self.ndim)
cuda.elementwise(in_params, out_params, operation, name)(
gy[0].reduced_view(),
*(dims + ys + self.ksize + self.stride + self.pad + (coeff, gx)))
return gx,
def forward_gpu(self, inputs):
x, = inputs
gx = cuda.elementwise(
'T x, T alpha', 'T gx',
'gx = x >= 0 ? (T)1 : (T)(alpha * exp(x))',
'elu_bwd')(
x, self.alpha)
self.retain_inputs((0,))
self.retain_outputs((0,))
return gx,
def forward_gpu(self, inputs):
self.retain_inputs((0, 1, 2))
x0, x1, gy = inputs
return cuda.elementwise(
'T x0, T x1, T gy',
'T gx0, T gx1',
'''
gx0 = gy / x1;
gx1 = -gx0 * x0 / x1;
''', 'div_bwd')(x0, x1, gy)
def _forward_gpu_compute_indexes_again(self, inputs):
x, ggx = inputs
n, c, h, w = ggx.shape
y_h = conv.get_conv_outsize(h, self.kh, self.sy, self.ph,
self.cover_all)
assert y_h > 0, 'Height in the output should be positive.'
y_w = conv.get_conv_outsize(w, self.kw, self.sx, self.pw,
self.cover_all)
assert y_w > 0, 'Width in the output should be positive.'
y = cuda.cupy.empty((n, c, y_h, y_w), dtype=x.dtype)
cuda.elementwise(
'raw T in, raw T ggx, int32 h, int32 w, int32 out_h,'
'int32 out_w, int32 kh, int32 kw, int32 sy, int32 sx,'
'int32 ph, int32 pw', 'T out', '''
int c0 = i / (out_h * out_w);
int out_y = i / out_w % out_h;
int out_x = i % out_w;
int in_y_0 = max(0, out_y * sy - ph);
int in_y_1 = min(h, out_y * sy + kh - ph);
int in_x_0 = max(0, out_x * sx - pw);
int in_x_1 = min(w, out_x * sx + kw - pw);
T maxval = in[in_x_0 + w * (in_y_0 + h * c0)];
int argmax_y = in_y_0;
int argmax_x = in_x_0;
for (int y = in_y_0; y < in_y_1; ++y) {
int offset_y = w * (y + h * c0);
for (int x = in_x_0; x < in_x_1; ++x) {
float v = in[x + offset_y];
if (maxval < v) {
argmax_y = y;
argmax_x = x;
}
}
}
out = ggx[argmax_x + w * (argmax_y + h * c0)]
''',
'max_pool_grad_fwd_calc_indexes')(x.reduced_view(),
ggx.reduced_view(), h, w, y_h,
y_w, self.kh, self.kw, self.sy,
self.sx, self.ph, self.pw, y)
return y,
def forward_gpu(self, inputs):
x, = inputs
gx = cuda.elementwise(
'T x, T r, T ir, T r2', 'T gx',
'gx = x >= 0 ? (T) r*pow((r2*x+1),(ir-1)) : (T)(r * exp(r*x))',
'eru_bwd')(
x, self.r, self.ir, self.r2)
self.retain_inputs((0,))
self.retain_outputs((0,))
return gx,
def forward_gpu(self, inputs):
x, = inputs
gx = cuda.elementwise(
'T x, T r, T ir, T r2', 'T gx',
'gx = r * pow((r2*abs(x) + 1),(ir - 1))',
'oru_bwd')(
x, self.r, self.ir, self.r2)
self.retain_inputs((0,))
self.retain_outputs((0,))
return gx,
def forward_gpu(self, inputs):
x = inputs[0]
b, c, h, w = x.shape
y = cuda.cupy.empty_like(x)
cuda.elementwise(
'raw T x, int32 c, int32 h, int32 w,'
'int32 kh, int32 kw,'
'int32 dy, int32 dx', 'T y', '''
int b0 = i / (c * h * w);
int rest = i % (c * h * w);
int c0 = rest / (h * w);
rest %= h * w;
int out_row = rest / w;
int out_col = rest % w;
int n_groups = kh * kw;
int group_size = c / n_groups;
int group_idx = c0 / group_size;
// Make sure that center group is last
if (group_idx == (n_groups - 1) / 2) {
group_idx = n_groups - 1;
} else if (group_idx == n_groups - 1) {
group_idx = (n_groups - 1) / 2;
}
int ky = (group_idx / kw) - kh / 2;
int kx = (group_idx % kw) - kw / 2;
if (group_idx >= n_groups) {
ky = 0;
kx = 0;
}
int in_row = -ky * dy + out_row;
int in_col = -kx * dx + out_col;
if (in_row >= 0 && in_row < h && in_col >= 0 && in_col < w) {
y = x[b0 * c * h * w + c0 * h * w + in_row * w + in_col];
} else {
y = 0;
}
''', 'shift_gpu')(x, c, h, w, self.kh, self.kw, self.dy, self.dx,
y)
return y,
def col2im_nd_gpu(col, stride, pad, dims):
n, c = col.shape[:2] # (n, c, k_1, ..., k_N, out_1, ..., out_N)
mid = (len(col.shape) - 2) // 2 + 2
ksize = col.shape[2:mid]
outs = col.shape[mid:]
ndim = len(dims)
assert len(outs) == len(ksize) == len(stride) == len(pad) == ndim
img_shape = (n, c) + dims # (n, c, d_1, d_2, ..., d_N)
img = cuda.cupy.empty(img_shape, dtype=col.dtype)
in_params, out_params, operation, name = \
conv_nd_kernel.Col2imNDKernel.generate(ndim)
cuda.elementwise(in_params, out_params, operation,
name)(col.reduced_view(),
*(dims + outs + ksize + stride + pad + (img, )))
return img
def forward_gpu(self, inputs):
if chainer.should_use_cudnn('>=auto') and 2 <= self.ndim <= 3:
# With cuDNN v3 or greater, use cuDNN implementation for inputs
# with spatial dimensions of two or more.
return self.forward_cudnn(inputs)
ndim = self.ndim
ksize = self.ksize
stride = self.stride
pad = self.pad
pad_value = self.pad_value
cover_all = self.cover_all
x, = inputs
in_shape = x.shape
in_dtype = x.dtype
n, c = in_shape[:2]
idims = in_shape[2:]
odims = tuple(
conv.get_conv_outsize(d, k, s, p, cover_all=cover_all)
for (d, k, s, p) in six.moves.zip(idims, ksize, stride, pad))
# (n, c, y_1, y_2, ..., y_N)
y_shape = (n, c) + odims
y = cuda.cupy.empty(y_shape, dtype=x.dtype)
if pad_value is None:
coeff = self._get_pooling_width(cuda.cupy, idims, x.dtype)
coeff = cuda.cupy.reciprocal(coeff, out=coeff)
else:
assert pad_value == 0
coeff = 1. / functools.reduce(operator.mul, ksize)
in_params, out_params, operation, name = \
average_pooling_nd_kernel.AveragePoolingNDKernelForward.generate(
ndim)
cuda.elementwise(in_params, out_params, operation,
name)(x.reduced_view(), *(idims + odims + ksize +
stride + pad + (coeff, y)))
self.coeff = coeff
self._in_shape = in_shape
self._in_dtype = in_dtype
return y,
def forward_gpu(self, inputs):
self.retain_inputs((0, 1))
y, gy = inputs
if (chainer.should_use_cudnn('==always') and self.x is not None
and gy.flags.c_contiguous):
gx = cudnn.activation_backward(self.x, y, gy, _mode)
else:
gx = cuda.elementwise('T y, T gy', 'T gx', 'gx = gy * (1 - y * y)',
'tanh_bwd')(y, gy)
return gx,
def backward_gpu(self, inputs, grad_outputs):
cupy = cuda.cupy
x, t = inputs
if x.size == 0:
return cupy.zeros(x.shape, dtype=x.dtype), None
if self.y is not None:
y = self.y
else:
y = log_softmax._log_softmax(x)
cupy.exp(y, out=y)
gloss = grad_outputs[0]
n_unit = t.size // len(t)
if self.reduce == 'mean':
coeff = gloss * self._coeff
else:
coeff = gloss[:, None, ...]
if self.class_weight is None:
gx = cuda.elementwise(
'T y, S t, T coeff, S n_channel, S n_unit, S ignore_label',
'T gx',
'''
const int c = (i / n_unit % n_channel);
gx = t == ignore_label ? 0 : coeff * (y - (c == t));
''',
'softmax_crossent_bwd')(
y, cupy.expand_dims(t, 1), coeff, x.shape[1],
n_unit, self.ignore_label)
else:
gx = cuda.elementwise(
'T y, raw T w, S t, T coeff, S n_channel, S n_unit, '
'S ignore_label',
'T gx',
'''
const int c = (i / n_unit % n_channel);
gx = t == ignore_label ? 0 : coeff * (y - (c == t)) * w[t];
''',
'softmax_crossent_weight_bwd')(
y, self.class_weight, cupy.expand_dims(t, 1), coeff,
x.shape[1], n_unit, self.ignore_label)
return gx, None
