def shaped_reverse_arange(shape, xp=cupy, dtype=numpy.float32):
size = internal.prod(shape)
a = numpy.arange(size, 0, -1)
if numpy.dtype(dtype).type == numpy.bool_:
return xp.array((a % 2 == 0).reshape(shape))
else:
return xp.array(a.astype(dtype).reshape(shape))
def shaped_reverse_arange(shape, xp=cupy, dtype=numpy.float32):
size = internal.prod(shape)
a = numpy.arange(size, 0, -1)
if numpy.dtype(dtype).type == numpy.bool_:
return xp.array((a % 2 == 0).reshape(shape))
else:
return xp.array(a.astype(dtype).reshape(shape))
def shaped_arange(shape, xp=cupy, dtype=numpy.float32, order='C'):
"""Returns an array with given shape, array module, and dtype.
Args:
shape(tuple of int): Shape of returned ndarray.
xp(numpy or cupy): Array module to use.
dtype(dtype): Dtype of returned ndarray.
order({'C', 'F'}): Order of returned ndarray.
Returns:
numpy.ndarray or cupy.ndarray:
The array filled with :math:`1, \\cdots, N` with specified dtype
with given shape, array module. Here, :math:`N` is
the size of the returned array.
If ``dtype`` is ``numpy.bool_``, evens (resp. odds) are converted to
``True`` (resp. ``False``).
"""
dtype = numpy.dtype(dtype)
a = numpy.arange(1, internal.prod(shape) + 1, 1)
if dtype == '?':
a = a % 2 == 0
elif dtype.kind == 'c':
a = a + a * 1j
return xp.array(a.astype(dtype).reshape(shape), order=order)
def size(self):
"""Number of elements this array holds.
This is equivalent to product over the shape tuple.
.. seealso:: :attr:`numpy.ndarray.size`
"""
return internal.prod(self._shape)
def size(self):
"""Number of elements this array holds.
This is equivalent to product over the shape tuple.
.. seealso:: :attr:`numpy.ndarray.size`
"""
return internal.prod(self._shape)
def take(a, indices, axis=None, out=None):
"""Takes elements of an array at specified indices along an axis.
This is an implementation of "fancy indexing" at single axis.
This function does not support ``mode`` option.
Args:
a (cupy.ndarray): Array to extract elements.
indices (int or array-like): Indices of elements that this function
takes.
axis (int): The axis along which to select indices. The flattened input
is used by default.
out (cupy.ndarray): Output array. If provided, it should be of
appropriate shape and dtype.
Returns:
cupy.ndarray: The result of fancy indexing.
.. seealso:: :func:`numpy.take`
"""
if axis is None:
a = a.ravel()
lshape = ()
rshape = ()
else:
if axis >= a.ndim:
raise ValueError('Axis overrun')
lshape = a.shape[:axis]
rshape = a.shape[axis + 1:]
if numpy.isscalar(indices):
a = cupy.rollaxis(a, axis)
if out is None:
return a[indices].copy()
else:
out[:] = a[indices]
return out
elif not isinstance(indices, cupy.ndarray):
indices = cupy.array(indices, dtype=int)
out_shape = lshape + indices.shape + rshape
if out is None:
out = cupy.empty(out_shape, dtype=a.dtype)
else:
if out.dtype != a.dtype:
raise TypeError('Output dtype mismatch')
if out.shape != out_shape:
raise ValueError('Output shape mismatch')
cdim = indices.size
rdim = internal.prod(rshape)
indices = cupy.reshape(
indices, (1,) * len(lshape) + indices.shape + (1,) * len(rshape))
return _take_kernel(a, indices, cdim, rdim, out)
def reshape(a, newshape):
"""Returns an array with new shape and same elements.
It tries to return a view if possible, otherwise returns a copy.
This function currently does not support ``order`` option.
Args:
a (cupy.ndarray): Array to be reshaped.
newshape (int or tuple of ints): The new shape of the array to return.
If it is an integer, then it is treated as a tuple of length one.
It should be compatible with ``a.size``. One of the elements can be
-1, which is automatically replaced with the appropriate value to
make the shape compatible with ``a.size``.
Returns:
cupy.ndarray: A reshaped view of ``a`` if possible, otherwise a copy.
.. seealso:: :func:`numpy.reshape`
"""
# TODO(beam2d): Support ordering option
if isinstance(newshape, collections.Sequence):
newshape = tuple(newshape)
else:
newshape = newshape,
shape = a.shape
if newshape == shape:
return a.view()
size = a.size
newshape = internal.infer_unknown_dimension(newshape, size)
if newshape == shape:
return a.view()
if internal.prod(newshape) != size:
raise RuntimeError('Total size mismatch on reshape')
newstrides = internal.get_strides_for_nocopy_reshape(a, newshape)
if newstrides is not None:
newarray = a.view()
else:
newarray = a.copy()
newstrides = internal.get_strides_for_nocopy_reshape(
newarray, newshape)
newarray._shape = newshape
newarray._strides = newstrides
if newarray._c_contiguous == 1:
newarray._f_contiguous = int(not size
or len(shape) - shape.count(1) <= 1)
else:
newarray._f_contiguous = -1
return newarray
def reshape(a, newshape):
"""Returns an array with new shape and same elements.
It tries to return a view if possible, otherwise returns a copy.
This function currently does not support ``order`` option.
Args:
a (cupy.ndarray): Array to be reshaped.
newshape (int or tuple of ints): The new shape of the array to return.
If it is an integer, then it is treated as a tuple of length one.
It should be compatible with ``a.size``. One of the elements can be
-1, which is automatically replaced with the appropriate value to
make the shape compatible with ``a.size``.
Returns:
cupy.ndarray: A reshaped view of ``a`` if possible, otherwise a copy.
.. seealso:: :func:`numpy.reshape`
"""
# TODO(beam2d): Support ordering option
if isinstance(newshape, collections.Sequence):
newshape = tuple(newshape)
else:
newshape = newshape,
shape = a.shape
if newshape == shape:
return a.view()
size = a.size
newshape = internal.infer_unknown_dimension(newshape, size)
if newshape == shape:
return a.view()
if internal.prod(newshape) != size:
raise RuntimeError('Total size mismatch on reshape')
newstrides = internal.get_strides_for_nocopy_reshape(a, newshape)
if newstrides is not None:
newarray = a.view()
else:
newarray = a.copy()
newstrides = internal.get_strides_for_nocopy_reshape(
newarray, newshape)
newarray._shape = newshape
newarray._strides = newstrides
if newarray._c_contiguous == 1:
newarray._f_contiguous = int(
not size or len(newshape) - newshape.count(1) <= 1)
else:
newarray._f_contiguous = -1
return newarray
def diagonal(a, offset=0, axis1=0, axis2=1):
"""Returns specified diagonals.
This function extracts the diagonals along two specified axes. The other
axes are not changed. This function returns a writable view of this array
as NumPy 1.10 will do.
Args:
a (cupy.ndarray): Array from which the diagonals are taken.
offset (int): Index of the diagonals. Zero indicates the main
diagonals, a positive value upper diagonals, and a negative value
lower diagonals.
axis1 (int): The first axis to take diagonals from.
axis2 (int): The second axis to take diagonals from.
Returns:
cupy.ndarray: A view of the diagonals of ``a``.
.. seealso:: :func:`numpy.diagonal`
"""
if axis1 < axis2:
min_axis, max_axis = axis1, axis2
else:
min_axis, max_axis = axis2, axis1
tr = list(six.moves.range(a.ndim))
del tr[max_axis]
del tr[min_axis]
if offset >= 0:
a = cupy.transpose(a, tr + [axis1, axis2])
else:
a = cupy.transpose(a, tr + [axis2, axis1])
offset = -offset
diag_size = max(0, min(a.shape[-2], a.shape[-1] - offset))
ret_shape = a.shape[:-2] + (diag_size,)
if diag_size == 0:
return cupy.empty(ret_shape, dtype=a.dtype)
a = a[..., :diag_size, offset:offset + diag_size]
ret = a.view()
ret._shape = a.shape[:-2] + (diag_size,)
ret._strides = a.strides[:-2] + (a.strides[-1] + a.strides[-2],)
ret._size = internal.prod(ret._shape)
ret._c_contiguous = -1
ret._f_contiguous = -1
return ret
def __init__(self, *arrays):
ndim = 0
for array in arrays:
if isinstance(array, cupy.ndarray):
ndim = max(ndim, array.ndim)
shape = [1] * ndim
for array in arrays:
if isinstance(array, cupy.ndarray):
offset = len(shape) - array.ndim
for i, dim in enumerate(array.shape):
if dim != 1 and shape[i + offset] != dim:
if shape[i + offset] != 1:
raise RuntimeError('Broadcasting failed')
else:
shape[i + offset] = dim
self.shape = tuple(shape)
self.size = internal.prod(self.shape)
self.nd = len(shape)
broadcasted = []
for array in arrays:
if not isinstance(array, cupy.ndarray):
broadcasted.append(array)
continue
if array.shape == self.shape:
broadcasted.append(array)
continue
offset = self.nd - array.ndim
strides = []
for i, dim in enumerate(shape):
if i < offset:
# TODO(okuta) fix if `dim` == 1
strides.append(0)
elif array.shape[i - offset] != dim:
strides.append(0)
else:
strides.append(array._strides[i - offset])
view = array.view()
view._shape = self.shape
view._strides = tuple(strides)
view._mark_dirty()
broadcasted.append(view)
self.values = broadcasted
def shaped_reverse_arange(shape, xp=cupy, dtype=numpy.float32):
"""Returns an array filled with decreasing numbers.
Args:
shape(tuple of int): Shape of returned ndarray.
xp(numpy or cupy): Array module to use.
dtype(dtype): Dtype of returned ndarray.
Returns:
numpy.ndarray or cupy.ndarray:
The array filled with :math:`N, \cdots, 1` with specified dtype
with given shape, array module.
Here, :math:`N` is the size of the returned array.
If ``dtype`` is ``numpy.bool_``, evens (resp. odds) are converted to
``True`` (resp. ``False``).
"""
size = internal.prod(shape)
a = numpy.arange(size, 0, -1)
if numpy.dtype(dtype).type == numpy.bool_:
return xp.array((a % 2 == 0).reshape(shape))
else:
return xp.array(a.astype(dtype).reshape(shape))
def shaped_reverse_arange(shape, xp=cupy, dtype=numpy.float32):
"""Returns an array filled with decreasing numbers.
Args:
shape(tuple of int): Shape of returned ndarray.
xp(numpy or cupy): Array module to use.
dtype(dtype): Dtype of returned ndarray.
Returns:
numpy.ndarray or cupy.ndarray:
The array filled with :math:`N, \cdots, 1` with specified dtype
with given shape, array module.
Here, :math:`N` is the size of the returned array.
If ``dtype`` is ``numpy.bool_``, evens (resp. odds) are converted to
``True`` (resp. ``False``).
"""
size = internal.prod(shape)
a = numpy.arange(size, 0, -1)
if numpy.dtype(dtype).type == numpy.bool_:
return xp.array((a % 2 == 0).reshape(shape))
else:
return xp.array(a.astype(dtype).reshape(shape))
def __init__(self, *arrays):
ndarray = cupy.ndarray
rev = slice(None, None, -1)
shape_arr = [a._shape[rev] for a in arrays
if isinstance(a, ndarray)]
r_shape = [max(ss) for ss in zip_longest(*shape_arr, fillvalue=0)]
self.shape = shape = tuple(r_shape[rev])
self.size = size = internal.prod(shape)
self.nd = ndim = len(shape)
broadcasted = list(arrays)
for i, a in enumerate(broadcasted):
if not isinstance(a, ndarray):
continue
a_shape = a.shape
if a_shape == shape:
continue
r_strides = [
a_st if sh == a_sh else (0 if a_sh == 1 else None)
for sh, a_sh, a_st
in six_zip(r_shape, a._shape[rev], a._strides[rev])]
if None in r_strides:
raise RuntimeError('Broadcasting failed')
offset = (0,) * (ndim - len(r_strides))
broadcasted[i] = view = a.view()
view._shape = shape
view._strides = offset + tuple(r_strides[rev])
view._size = size
view._c_contiguous = -1
view._f_contiguous = -1
self.values = tuple(broadcasted)
def __init__(self, *arrays):
ndarray = cupy.ndarray
rev = slice(None, None, -1)
shape_arr = [a._shape[rev] for a in arrays if isinstance(a, ndarray)]
r_shape = [max(ss) for ss in zip_longest(*shape_arr, fillvalue=0)]
self.shape = shape = tuple(r_shape[rev])
self.size = size = internal.prod(shape)
self.nd = ndim = len(shape)
broadcasted = list(arrays)
for i, a in enumerate(broadcasted):
if not isinstance(a, ndarray):
continue
a_shape = a.shape
if a_shape == shape:
continue
r_strides = [
a_st if sh == a_sh else
(0 if a_sh == 1 else None) for sh, a_sh, a_st in six_zip(
r_shape, a._shape[rev], a._strides[rev])
]
if None in r_strides:
raise ValueError('Broadcasting failed')
offset = (0, ) * (ndim - len(r_strides))
broadcasted[i] = view = a.view()
view._shape = shape
view._strides = offset + tuple(r_strides[rev])
view._size = size
view._c_contiguous = -1
view._f_contiguous = -1
self.values = tuple(broadcasted)
def __init__(self, shape):
self.shape = shape
self.size = internal.prod(shape)
def tensordot(a, b, axes=2):
"""Returns the tensor dot product of two arrays along specified axes.
This is equivalent to compute dot product along the specified axes which
are treated as one axis by reshaping.
Args:
a (cupy.ndarray): The first argument.
b (cupy.ndarray): The second argument.
axes:
- If it is an integer, then ``axes`` axes at the last of ``a`` and
the first of ``b`` are used.
- If it is a pair of sequences of integers, then these two
sequences specify the list of axes for ``a`` and ``b``. The
corresponding axes are paired for sum-product.
Returns:
cupy.ndarray: The tensor dot product of ``a`` and ``b`` along the
axes specified by ``axes``.
.. seealso:: :func:`numpy.tensordot`
"""
a_ndim = a.ndim
b_ndim = b.ndim
if a_ndim == 0 or b_ndim == 0:
if axes != 0 and axes != ((), ()):
raise ValueError('An input is zero-dim while axes has dimensions')
return cupy.multiply(a, b)
if isinstance(axes, collections.Sequence):
if len(axes) != 2:
raise ValueError('Axes must consist of two arrays.')
a_axes, b_axes = axes
if numpy.isscalar(a_axes):
a_axes = a_axes,
if numpy.isscalar(b_axes):
b_axes = b_axes,
else:
a_axes = tuple(six.moves.range(a_ndim - axes, a_ndim))
b_axes = tuple(six.moves.range(axes))
sum_ndim = len(a_axes)
if sum_ndim != len(b_axes):
raise ValueError('Axes length mismatch')
for a_axis, b_axis in zip(a_axes, b_axes):
if a.shape[a_axis] != b.shape[b_axis]:
raise ValueError('Axis dimension mismatch')
# Make the axes non-negative
a = _move_axes_to_head(a, [axis % a_ndim for axis in a_axes])
b = _move_axes_to_head(b, [axis % b_ndim for axis in b_axes])
ret_shape = a.shape[sum_ndim:] + b.shape[sum_ndim:]
k = internal.prod(a.shape[:sum_ndim])
n = a.size // k
m = b.size // k
return core.tensordot_core(a, b, None, n, m, k, ret_shape)
def tensordot(a, b, axes=2, out=None):
"""Returns the tensor dot product of two arrays along specified axes.
This is equivalent to compute dot product along the specified axes which
are treated as one axis by reshaping.
Args:
a (cupy.ndarray): The first argument.
b (cupy.ndarray): The second argument.
axes:
- If it is an integer, then ``axes`` axes at the last of ``a`` and
the first of ``b`` are used.
- If it is a pair of sequences of integers, then these two
sequences specify the list of axes for ``a`` and ``b``. The
corresponding axes are paired for sum-product.
out (cupy.ndarray): Output array.
Returns:
cupy.ndarray: The tensor dot product of ``a`` and ``b`` along the
axes specified by ``axes``.
.. seealso:: :func:`numpy.tensordot`
"""
if a.ndim == 0 or b.ndim == 0:
if axes != 0 and axes != ((), ()):
raise ValueError('An input is zero-dim while axes has dimensions')
return cupy.multiply(a, b, out=out)
ret_dtype = numpy.find_common_type([a.dtype, b.dtype], [])
# Cast to float32 or float64
dtype = numpy.find_common_type([a.dtype, b.dtype, 'f'], [])
a = a.astype(dtype, copy=False)
b = b.astype(dtype, copy=False)
if a.dtype.type == numpy.float32:
dot = cublas.sdot
gemv = cublas.sgemv
ger = cublas.sger
gemm = cublas.sgemm
elif a.dtype.type == numpy.float64:
dot = cublas.ddot
gemv = cublas.dgemv
ger = cublas.dger
gemm = cublas.dgemm
if numpy.isscalar(axes):
axes = [list(six.moves.range(a.ndim - axes, a.ndim)),
list(six.moves.range(axes))]
else:
axes = list(axes)
if numpy.isscalar(axes[0]):
axes[0] = (axes[0],)
if numpy.isscalar(axes[1]):
axes[1] = (axes[1],)
if len(axes) != 2:
raise ValueError('Axes must consist of two arrays.')
if len(axes[0]) != len(axes[1]):
raise ValueError('Axes length mismatch')
for a_axis, b_axis in zip(*axes):
if not (-a.ndim <= a_axis < a.ndim and
-b.ndim <= b_axis < b.ndim):
raise IndexError('Axis overrun')
if a.shape[a_axis] != b.shape[b_axis]:
raise ValueError('Axis dimension mismatch')
# Make the axes non-negative
axes = (tuple(axis % a.ndim for axis in axes[0]),
tuple(axis % b.ndim for axis in axes[1]))
sum_ndim = len(axes[0])
a = _move_axes_to_head(a, axes[0])
b = _move_axes_to_head(b, axes[1])
m = internal.prod(b.shape[sum_ndim:])
n = internal.prod(a.shape[sum_ndim:])
ret_shape = a.shape[sum_ndim:] + b.shape[sum_ndim:]
if out is not None:
if out.size != internal.prod(ret_shape):
raise ValueError('Output array has an invalid size')
if not out.flags.c_contiguous:
raise ValueError('Output array must be C-contiguous')
if 0 in a.shape or 0 in b.shape:
if 0 not in a.shape or 0 not in b.shape:
raise ValueError('cannot dot zero-sized and non-zero-sized arrays')
if out is None:
return cupy.zeros(ret_shape, dtype=ret_dtype)
else:
out.fill(0)
return out
if out is None:
out = cupy.empty(ret_shape, dtype=dtype)
if dtype == ret_dtype:
ret = out
else:
ret = cupy.empty(ret_shape, dtype=ret_dtype)
else:
ret = out
if out.dtype != dtype:
out = cupy.empty(ret_shape, dtype=dtype)
k = a.size // n
# It copies the operands if needed
a = a.reshape(k, n)
b = b.reshape(k, m)
c = out.view()
c.shape = (n, m)
# Be careful that cuBLAS uses the FORTRAN-order matrix representation.
handle = cuda.Device().cublas_handle
if k == 1:
if n == 1 or m == 1:
# Scalar-vector product
cupy.multiply(a.T, b, c)
else:
# Outer product A^T * B
# c is C-contiguous while cuBLAS requires F-contiguous arrays, so
# we compute C^T = B^T * A here.
c.fill(0)
a, inca = _to_cublas_vector(a, 1)
b, incb = _to_cublas_vector(b, 1)
ger(handle, m, n, 1, b._fptr, incb, a._fptr, inca, c._fptr, m)
elif n == 1:
if m == 1:
# Inner product
a, inca = _to_cublas_vector(a, 0)
b, incb = _to_cublas_vector(b, 0)
mode = cublas.getPointerMode(handle)
cublas.setPointerMode(handle,
cublas.CUBLAS_POINTER_MODE_DEVICE)
try:
dot(handle, k, a._fptr, inca, b._fptr, incb, c._fptr)
finally:
cublas.setPointerMode(handle, mode)
else:
# Matrix-vector product B^T * A
a, inca = _to_cublas_vector(a, 1)
b, transb, ldb = _mat_to_cublas_contiguous(b.T)
if transb:
# gemv requires (m, k) as the original matrix dimensions
# rather than the transposed dimensions.
m, k = k, m
gemv(handle, transb, m, k, 1, b._fptr, ldb, a._fptr, inca,
0, c._fptr, 1)
elif m == 1:
# Matrix-vector product A^T * B
a, transa, lda = _mat_to_cublas_contiguous(a.T)
b, incb = _to_cublas_vector(b, 1)
if not transa:
# gemv requires (n, k) as the original matrix dimensions rather
# than the transposed dimensions.
n, k = k, n
gemv(handle, transa, n, k, 1, a._fptr, lda, b._fptr, incb, 0, c._fptr,
1)
else:
# Matrix-Matrix product A^T * B
# c is C-contiguous while cuBLAS assumes F-contiguous inputs, so we
# compute C^T = B^T * A here.
a, transa, lda = _mat_to_cublas_contiguous(a)
b, transb, ldb = _mat_to_cublas_contiguous(b.T)
gemm(handle, transb, transa, m, n, k, 1, b._fptr, ldb, a._fptr,
lda, 0, c._fptr, m)
if dtype != ret_dtype:
elementwise.copy(out, ret)
return ret
def __getitem__(self, slices):
# It supports the basic indexing (by slices, ints or Ellipsis) only.
# TODO(beam2d): Support the advanced indexing of NumPy.
if not isinstance(slices, tuple):
slices = [slices]
else:
slices = list(slices)
if six.moves.builtins.any(isinstance(s, ndarray) for s in slices):
raise ValueError('Advanced indexing is not supported')
# Expand ellipsis into empty slices
n_newaxes = slices.count(newaxis)
n_ellipses = slices.count(Ellipsis)
if n_ellipses > 0:
if n_ellipses > 1:
raise ValueError('Only one Ellipsis is allowed in index')
ellipsis = slices.index(Ellipsis)
ellipsis_size = self.ndim - (len(slices) - n_newaxes - 1)
slices[ellipsis:ellipsis + 1] = [slice(None)] * ellipsis_size
slices += [slice(None)] * (self.ndim - len(slices) + n_newaxes)
# Create new shape and stride
shape = []
strides = []
j = 0
offset = 0
for i, s in enumerate(slices):
if s is newaxis:
shape.append(1)
if j < self.ndim:
strides.append(self._strides[j])
elif self.ndim > 0:
strides.append(self._strides[-1])
else:
strides.append(self.itemsize)
elif isinstance(s, slice):
s = internal.complete_slice(s, self._shape[j])
if s.step > 0:
dim = (s.stop - s.start - 1) // s.step + 1
else:
dim = (s.stop - s.start + 1) // s.step + 1
shape.append(dim)
strides.append(self._strides[j] * s.step)
offset += s.start * self._strides[j]
j += 1
elif numpy.isscalar(s):
s = int(s)
if s >= self._shape[j]:
raise IndexError('Index %s exceeds the size %s at axis %s'
% (s, self._shape[j], j))
offset += s * self._strides[j]
j += 1
else:
raise TypeError('Invalid index type: %s' % type(slices[i]))
v = self.view()
v._shape = tuple(shape)
v._strides = tuple(strides)
v._size = internal.prod(shape)
v.data = self.data + offset
v._c_contiguous = -1
v._f_contiguous = -1
return v
def shaped_reverse_arange(shape, xp=cupy, dtype=numpy.float32):
size = internal.prod(shape)
a = numpy.arange(size, 0, -1)
return xp.array(a.astype(dtype).reshape(shape))
def shaped_arange(shape, xp=cupy, dtype=numpy.float32):
a = numpy.arange(1, internal.prod(shape) + 1, 1)
if numpy.dtype(dtype).type == numpy.bool_:
return xp.array((a % 2 == 0).reshape(shape))
else:
return xp.array(a.astype(dtype).reshape(shape))
def shaped_arange(shape, xp=cupy, dtype=numpy.float32):
a = numpy.arange(1, internal.prod(shape) + 1, 1)
if numpy.dtype(dtype).type == numpy.bool_:
return xp.array((a % 2 == 0).reshape(shape))
else:
return xp.array(a.astype(dtype).reshape(shape))
def shaped_reverse_arange(shape, xp=cupy, dtype=numpy.float32):
size = internal.prod(shape)
a = numpy.arange(size, 0, -1)
return xp.array(a.astype(dtype).reshape(shape))
def __getitem__(self, slices):
# It supports the basic indexing (by slices, ints or Ellipsis) only.
# TODO(beam2d): Support the advanced indexing of NumPy.
if not isinstance(slices, tuple):
slices = [slices]
else:
slices = list(slices)
if any(isinstance(s, ndarray) for s in slices):
raise ValueError('Advanced indexing is not supported')
# Expand ellipsis into empty slices
n_newaxes = slices.count(newaxis)
n_ellipses = slices.count(Ellipsis)
if n_ellipses > 0:
if n_ellipses > 1:
raise ValueError('Only one Ellipsis is allowed in index')
ellipsis = slices.index(Ellipsis)
ellipsis_size = self.ndim - (len(slices) - n_newaxes - 1)
slices[ellipsis:ellipsis + 1] = [slice(None)] * ellipsis_size
slices += [slice(None)] * (self.ndim - len(slices) + n_newaxes)
# Create new shape and stride
shape = []
strides = []
j = 0
offset = 0
for i, s in enumerate(slices):
if s is newaxis:
shape.append(1)
if j < self.ndim:
strides.append(self._strides[j])
elif self.ndim > 0:
strides.append(self._strides[-1])
else:
strides.append(self.itemsize)
elif isinstance(s, slice):
s = internal.complete_slice(s, self._shape[j])
if s.step > 0:
dim = (s.stop - s.start - 1) // s.step + 1
else:
dim = (s.stop - s.start + 1) // s.step + 1
shape.append(dim)
strides.append(self._strides[j] * s.step)
offset += s.start * self._strides[j]
j += 1
elif numpy.isscalar(s):
s = int(s)
if s >= self._shape[j]:
raise IndexError(
'Index %s exceeds the size %s at axis %s' %
(s, self._shape[j], j))
offset += s * self._strides[j]
j += 1
else:
raise TypeError('Invalid index type: %s' % type(slices[i]))
v = self.view()
v._shape = tuple(shape)
v._strides = tuple(strides)
v._size = internal.prod(shape)
v.data = self.data + offset
v._c_contiguous = -1
v._f_contiguous = -1
return v
def tensordot(a, b, axes=2):
"""Returns the tensor dot product of two arrays along specified axes.
This is equivalent to compute dot product along the specified axes which
are treated as one axis by reshaping.
Args:
a (cupy.ndarray): The first argument.
b (cupy.ndarray): The second argument.
axes:
- If it is an integer, then ``axes`` axes at the last of ``a`` and
the first of ``b`` are used.
- If it is a pair of sequences of integers, then these two
sequences specify the list of axes for ``a`` and ``b``. The
corresponding axes are paired for sum-product.
out (cupy.ndarray): Output array.
Returns:
cupy.ndarray: The tensor dot product of ``a`` and ``b`` along the
axes specified by ``axes``.
.. seealso:: :func:`numpy.tensordot`
"""
a_ndim = a.ndim
b_ndim = b.ndim
if a_ndim == 0 or b_ndim == 0:
if axes != 0 and axes != ((), ()):
raise ValueError('An input is zero-dim while axes has dimensions')
return cupy.multiply(a, b)
if isinstance(axes, collections.Sequence):
if len(axes) != 2:
raise ValueError('Axes must consist of two arrays.')
a_axes, b_axes = axes
if numpy.isscalar(a_axes):
a_axes = a_axes,
if numpy.isscalar(b_axes):
b_axes = b_axes,
else:
a_axes = tuple(six.moves.range(a_ndim - axes, a_ndim))
b_axes = tuple(six.moves.range(axes))
sum_ndim = len(a_axes)
if sum_ndim != len(b_axes):
raise ValueError('Axes length mismatch')
for a_axis, b_axis in zip(a_axes, b_axes):
if a.shape[a_axis] != b.shape[b_axis]:
raise ValueError('Axis dimension mismatch')
# Make the axes non-negative
a = _move_axes_to_head(a, [axis % a_ndim for axis in a_axes])
b = _move_axes_to_head(b, [axis % b_ndim for axis in b_axes])
ret_shape = a.shape[sum_ndim:] + b.shape[sum_ndim:]
k = internal.prod(a.shape[:sum_ndim])
n = a.size // k
m = b.size // k
return _tensordot_core(a, b, None, n, m, k, ret_shape)
def __init__(self, shape):
self.shape = shape
self.size = internal.prod(shape)
