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symbolic_script.cpp
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symbolic_script.cpp
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#include <torch/csrc/jit/runtime/symbolic_script.h>
#include <torch/csrc/jit/frontend/ir_emitter.h>
#include <torch/csrc/jit/runtime/operator.h>
namespace torch {
namespace jit {
namespace {
std::mutex lock;
const std::vector<std::string> functions = {
R"(
#### HELPER FUNCTIONS ###
#### PREFIX: AD_ ###
#### SCHEMA NOT SAVED IN CACHE ###
def AD_unsqueeze_multiple(t,
dims: List[int],
n_dims: int):
seen = [False] * n_dims
for i in range(len(dims)):
seen[dims[i]] = True
for d in range(n_dims):
if seen[d]:
t = t.unsqueeze(d)
return t
def AD_sum_backward(grad,
sizes: List[int],
dims: Optional[List[int]],
keepdim: bool):
if not keepdim and len(sizes) > 0:
if dims is None:
return grad.expand(sizes)
elif len(dims) == 1:
return grad.unsqueeze(dims[0]).expand(sizes)
else:
res = AD_unsqueeze_multiple(grad, dims, len(sizes))
return res.expand(sizes)
else:
return grad.expand(sizes)
def AD_logsumexp_backward(grad, self, result,
dim: List[int],
keepdim: bool):
if not keepdim and self.dim() != 0:
n_dims = len(self.size())
grad = AD_unsqueeze_multiple(grad, dim, n_dims)
result = AD_unsqueeze_multiple(result, dim, n_dims)
return grad * (self - result).exp()
def mean_0(self, *, dtype: Optional[int]):
self_size = self.size()
self_numel = self.numel()
self_scalar_type = self.dtype
def backward(grad_output):
return grad_output.expand(self_size).to(self_scalar_type) / self_numel, None
return torch.mean(self, dtype=dtype), backward
def mean_1(self,
dim: Optional[List[int]],
keepdim: bool,
*,
dtype: Optional[int]):
self_size = self.size()
self_scalar_type = self.dtype
def backward(grad_output):
grad_self = AD_sum_backward(grad_output, self_size, dim, keepdim).to(self_scalar_type) / AD_safe_size(self_size, dim)
return grad_self, None, None, None
return torch.mean(self, dim, keepdim, dtype=dtype), backward
def logsumexp(self,
dim: List[int],
keepdim: bool):
result = torch.logsumexp(self, dim, keepdim)
self_dim = self.dim()
def backward(grad_output):
grad_self = AD_logsumexp_backward(grad_output, self, result, dim, keepdim)
return grad_self, None, None
return result, backward
def AD_bool_to_int(b: bool):
# FIXME: torchscript: int - bool
if b:
i = 1
else:
i = 0
return i
def AD_var_backward_0(grad, self, correction: number):
# FIXME: torchscript: div(float, float)
return grad * (self - self.mean()) * 2.0 / (self.numel() - correction)
def AD_safe_size(sizes: List[int],
dims: Optional[List[int]]):
if len(sizes) == 0:
return 1
size = 1
if dims is None:
for s in sizes:
size *= s
else:
for i in range(len(dims)):
d = dims[i]
size *= sizes[d]
return size
def AD_var_backward_1(grad,
self,
dim: List[int],
correction: number,
keepdim: bool):
if self.dim() == 0:
return AD_var_backward_0(grad, self, correction)
self_size = self.size()
if not keepdim and self.dim() > 1:
grad = AD_unsqueeze_multiple(grad, dim, len(self_size))
# FIXME: torchscript: div(float, float)
return grad * (self - self.mean(dim, True)) * 2.0 / (AD_safe_size(self_size, dim) - correction)
def AD_var_backward_2(grad,
self,
dim: Optional[List[int]],
correction: Optional[number],
keepdim: bool):
if correction is None:
correction = 1
if self.dim() == 0 or dim is None:
return AD_var_backward_0(grad, self, correction)
return AD_var_backward_1(grad, self, dim, correction, keepdim)
def std_0(self,
unbiased: bool=True):
std_out = torch.std(self, unbiased)
def backward(grad_output):
correction = AD_bool_to_int(unbiased)
grad_self = AD_var_backward_0(grad_output / (std_out * 2), self, correction)
return grad_self, None
return std_out, backward
def std_1(self,
dim: Optional[List[int]],
unbiased: bool,
keepdim: bool):
std_out = torch.std(self, dim, unbiased, keepdim)
def backward(grad_output):
correction = AD_bool_to_int(unbiased)
grad_self = AD_var_backward_2(grad_output / (std_out * 2), self, dim, correction, keepdim)
return grad_self, None, None, None
return std_out, backward
def std_2(self,
dim: Optional[List[int]],
*,
correction: Optional[number],
keepdim: bool):
std_out = torch.std(self, dim, correction=correction, keepdim=keepdim)
def backward(grad_output):
grad_self = AD_var_backward_2(grad_output / (std_out * 2), self, dim, correction, keepdim)
return grad_self, None, None, None
return std_out, backward
def var_0(self,
unbiased: bool=True):
def backward(grad_output):
correction = AD_bool_to_int(unbiased)
grad_self = AD_var_backward_0(grad_output, self, correction)
return grad_self, None
return torch.var(self, unbiased), backward
def var_1(self,
dim: Optional[List[int]],
unbiased: bool,
keepdim: bool):
def backward(grad_output):
correction = AD_bool_to_int(unbiased)
grad_self = AD_var_backward_2(grad_output, self, dim, correction, keepdim)
return grad_self, None, None, None
return torch.var(self, dim, unbiased, keepdim), backward
def var_2(self,
dim: Optional[List[int]],
*,
correction: Optional[number],
keepdim: bool):
def backward(grad_output):
grad_self = AD_var_backward_2(grad_output, self, dim, correction, keepdim)
return grad_self, None, None, None
return torch.var(self, dim, correction=correction, keepdim=keepdim), backward
def tanh(self):
output = torch.tanh(self)
def backward(grad_output):
return grad_output * (1 - output * output)
return output, backward
def AD_index_select_backward(grad,
dim: int,
indices,
sizes: List[int],
keepdim: bool):
if not keepdim and len(sizes) > 0:
grad = grad.unsqueeze(dim)
indices = indices.unsqueeze(dim)
# FIXME: torchscript: torch.zeros(sizes, grad.options())
return torch.zeros(sizes).to(grad).scatter_(dim, indices, grad)
# def topk(self,
# k: int,
# dim: int = -1,
# largest: bool = True,
# sorted: bool = True):
# result0, result1 = torch.topk(self, k, dim, largest, sorted)
# self_size = self.size()
# def backward(grad_output):
# grad_self = AD_index_select_backward(grad_output, dim, result1, self_size, True)
# return grad_self, None, None, None, None
# return result0, result1, backward
# def kthvalue(self,
# k: int,
# dim: int,
# keepdim: bool):
# result0, result1 = torch.kthvalue(self, k, dim, keepdim)
# self_size = self.size()
# def backward(grad_output):
# grad_self = AD_index_select_backward(grad_output, dim, result1, self_size, keepdim)
# return grad_self, None, None, None
# return result0, result1, backward
def AD_mm_backward_self(grad, mat2):
return grad.mm(mat2.t())
def AD_mm_backward_mat2(grad, self):
return self.t().mm(grad)
def mm(self, mat2):
def backward(grad_output):
grad_self = AD_mm_backward_self(grad_output, mat2)
grad_mat2 = AD_mm_backward_mat2(grad_output, self)
return grad_self, grad_mat2
return torch.mm(self, mat2), backward
def AD_permute_backward(grad,
fwd_dims: List[int]):
ndims = len(fwd_dims)
dims = [0] * ndims
for i in range(ndims):
dims[fwd_dims[i]] = i
return grad.permute(dims)
def permute(self,
dims: List[int]):
def backward(grad_output):
grad_self = AD_permute_backward(grad_output, dims)
return grad_self, None
return torch.permute(self, dims), backward
def AD_select_backward(grad,
input_sizes: List[int],
dim: int,
index: int):
# FIXME: torchscript: torch.zeros(sizes, grad.options())
grad_input = torch.zeros(input_sizes).to(grad)
grad_input.select(dim, index).copy_(grad)
return grad_input
# TODO: fix torch.zeros(sizes, grad.options()) before enabling select, topk, kthvalue
# def select(self,
# dim: int,
# index: int):
# self_size = self.size()
# def backward(grad_output):
# grad_self = AD_select_backward(grad_output, self_size, dim, index)
# return grad_self, None, None
# return torch.select(self, dim, index), backward
def AD_slice_backward(grad,
input_sizes: List[int],
dim: int,
start: int,
end: int,
step: int):
# FIXME: torchscript: torch.zeros(sizes, grad.options())
grad_input = torch.zeros(input_sizes).to(grad)
grad_input.slice(dim, start, end, step).copy_(grad)
return grad_input
# DON'T enable slice unless we can correctly handle view ops in graph executor.
# It triggers failure of TestJit.test_sample in test_distributions.py.
# def slice(self,
# dim: int=0,
# start: int=0,
# end: int=9223372036854775807,
# step: int=1):
# def backward(grad_output):
# grad_self = AD_slice_backward(grad_output, self.size(), dim, start, end, step)
# return grad_self, None, None, None, None
# return torch.slice(self, dim, start, end, step), backward
def AD_unsqueeze_to_0(self,
sizes: List[int]):
ndims = len(sizes)
for i in range(ndims):
if sizes[i] == 1:
self = self.unsqueeze(i)
return self
def AD_unsqueeze_to_1(self,
dim: int,
sizes: List[int]):
if len(sizes) > 0 and sizes[dim] == 1:
return self.unsqueeze(dim)
return self
def squeeze_0(self):
self_size = self.size()
def backward(grad_output):
grad_self = AD_unsqueeze_to_0(grad_output, self_size)
return grad_self
return torch.squeeze(self), backward
def squeeze_1(self,
dim: int):
self_size = self.size()
def backward(grad_output):
grad_self = AD_unsqueeze_to_1(grad_output, dim, self_size)
return grad_self, None
return torch.squeeze(self, dim), backward
def AD_infer_size(a: List[int],
b: List[int]):
dimsA = len(a)
dimsB = len(b)
ndim = dimsA if dimsA > dimsB else dimsB
expand_sizes = [0] * ndim
for i in range(ndim):
idx = - i + ndim - 1
sizeA = a[i] if dimsA + i >= 0 else 1
sizeB = b[i] if dimsB + i >= 0 else 1
# Assert sizeA == sizeB or sizeA == 1 or sizeB == 1
expand_sizes[i] = sizeB if sizeA == 1 else sizeA
return expand_sizes
def AD_bmm_backward_self(grad, mat2):
return grad.bmm(mat2.transpose(1, 2))
def AD_bmm_backward_mat2(grad, self):
return self.transpose(1, 2).bmm(grad)
def bmm(self, mat2):
def backward(grad_output):
grad_self = AD_bmm_backward_self(grad_output, mat2)
grad_mat2 = AD_bmm_backward_mat2(grad_output, self)
return grad_self, grad_mat2
return torch.bmm(self, mat2), backward
)",
R"(
def AD_mat_transpose(mat):
dim = mat.dim()
if dim == 1:
out = mat
elif dim == 2:
out = mat.t()
else:
dims = rangelist(dim)
dims[-1] = dim - 2
dims[-2] = dim - 1
out = mat.permute(dims)
return out
# In matmul backward case of [b, m, n] * [b, n, p] => [m, p],
# instead of doing [b, m, p] and then reduce to [m, p]
# whice potentially uses large intermediate of size b*m*p,
# we do [m, bn] * [bn, p] to avoid having the large
# intermediate, thus reduces max memory usage.
def AD_matmul_bw_special_fold(mat1, mat2):
mat1_transpose = AD_mat_transpose(mat1)
mat1_fold = mat1_transpose.reshape(-1, mat1_transpose.size()[-1])
mat2_fold = mat2.reshape(-1, mat2.size()[-1])
return mat1_fold.t().mm(mat2_fold)
def AD_matmul_bw_size(mat1, mat2,
out_size: List[int]):
dim1 = mat1.dim()
dim2 = mat2.dim()
dim_out = len(out_size)
if dim1 == 0 or dim2 == 0:
out = mat1 * mat2
elif dim_out == 2 and dim1 == dim2 and dim1 >=3:
out = AD_matmul_bw_special_fold(mat1, mat2)
elif dim_out == 1 and dim1 - dim2 == 1 and dim1 >= 3:
mat2_unsqueeze = mat2.unsqueeze(-1)
out = AD_matmul_bw_special_fold(mat1, mat2_unsqueeze)
out = out.squeeze(-1)
elif dim1 + dim2 == dim_out:
if dim2 == 1:
target_dim2 = 0
else:
target_dim2 = -2
out = torch.matmul(mat1.unsqueeze(dim1), mat2.unsqueeze(target_dim2))
elif dim_out == dim1 - dim2:
out = torch.matmul(mat1, mat2.unsqueeze(dim2)).squeeze(-1)
elif dim_out == dim2 - dim1:
out = torch.matmul(mat1.unsqueeze(-2), mat2).squeeze(-2)
else:
out = torch.matmul(mat1, mat2)
return out
def matmul(self, other):
def backward(grad_output):
self_size = self.size()
other_size = other.size()
grad_self = AD_matmul_bw_size(grad_output, AD_mat_transpose(other), self_size)._grad_sum_to_size(self_size)
grad_other = AD_matmul_bw_size(AD_mat_transpose(self), grad_output, other_size)._grad_sum_to_size(other_size)
return grad_self, grad_other
return torch.matmul(self, other), backward
def linear(input : Tensor,
weight : Tensor,
bias : Optional[Tensor]):
result = torch.linear(input, weight, bias)
def backward(grad_output):
if bias is not None:
grad_bias = grad_output._grad_sum_to_size(bias.size())
else:
grad_bias = None
weight_size = weight.size()
grad_input = torch.matmul(grad_output, weight)
grad_weight = torch.matmul(grad_output.reshape(-1, weight_size[0]).t(), input.reshape(-1, weight_size[1]))
# Note: calling unchecked_unwrap_optional is only safe, when we
# directly return grad_bias directly back to bias.
# Because in the case where `bias is None`, unwrapped
# grad_bias would just be pruned away.
return grad_input, grad_weight, grad_bias.unchecked_unwrap_optional
return result, backward
)",
R"(
def addcmul(self,
tensor1,
tensor2,
*,
value: number):
result = torch.addcmul(self, tensor1, tensor2, value=value)
self_size = torch._size_if_not_equal(self.size(), result.size())
tensor1_size = torch._size_if_not_equal(tensor1.size(), result.size())
tensor2_size = torch._size_if_not_equal(tensor2.size(), result.size())
def backward(grad_output):
grad = grad_output * value
grad_tensor1 = (grad * tensor2)._grad_sum_to_size(tensor1_size)
grad_tensor2 = (grad * tensor1)._grad_sum_to_size(tensor2_size)
return grad_output._grad_sum_to_size(self_size), grad_tensor1, grad_tensor2, None
return result, backward
def _autocast_to_full_precision(self, cuda_enabled : bool, cpu_enabled : bool):
self_dtype = self.dtype
def backward(grad_output):
return grad_output.to(self_dtype), None, None
return torch._autocast_to_full_precision(self, cuda_enabled, cpu_enabled), backward
def _autocast_to_reduced_precision(self,
cuda_enabled : bool,
cpu_enabled : bool,
cuda_dtype : int,
cpu_dtype : int):
self_dtype = self.dtype
def backward(grad_output):
return grad_output.to(self_dtype), None, None, None, None
return torch._autocast_to_reduced_precision(self, cuda_enabled, cpu_enabled, cuda_dtype, cpu_dtype), backward
def _dim_arange(like,
dim: int):
def backward(grad_output):
return None, None
return torch._dim_arange(like, dim), backward
def contiguous(self, *, memory_format: int=0):
def backward(grad_output):
return grad_output, None
return self.contiguous(memory_format=memory_format), backward
def dot(self, tensor):
def backward(grad_output):
return grad_output * tensor, grad_output * self
return torch.dot(self, tensor), backward
def erf(self):
def backward(grad_output):
# Precomputed constant C = 2.0 / math.sqrt(math.pi)
C = 1.1283791670955126
return C * torch.exp(- self * self) * grad_output
return torch.erf(self), backward
def expand(self,
size: List[int],
*,
implicit: bool=False):
result = torch.expand(self, size, implicit=implicit)
self_size = torch._size_if_not_equal(self.size(), result.size())
def backward(grad_output):
return grad_output._grad_sum_to_size(self_size), None, None
return result, backward
def expand_as(self, other):
result = torch.expand_as(self, other)
self_size = torch._size_if_not_equal(self.size(), result.size())
def backward(grad_output):
return grad_output._grad_sum_to_size(self_size), None
return result, backward
def full_like(self,
fill_value: float):
def backward(grad_output):
return None, None
return torch.full_like(self, fill_value, memory_format=1), backward
def lerp_0(self,
end,
weight: number):
result = torch.lerp(self, end, weight)
self_size = torch._size_if_not_equal(self.size(), result.size())
end_size = torch._size_if_not_equal(end.size(), result.size())
def backward(grad_output):
grad_self = (grad_output * (1 - float(weight)))._grad_sum_to_size(self_size)
grad_end = (grad_output * float(weight))._grad_sum_to_size(end_size)
return grad_self, grad_end, None
return result, backward
def lerp_1(self,
end,
weight):
result = torch.lerp(self, end, weight)
self_size = torch._size_if_not_equal(self.size(), result.size())
end_size = torch._size_if_not_equal(end.size(), result.size())
weight_size = torch._size_if_not_equal(weight.size(), result.size())
def backward(grad_output):
grad_self = (grad_output * (1 - weight))._grad_sum_to_size(self_size)
grad_end = (grad_output * weight)._grad_sum_to_size(end_size)
grad_weight = (grad_output * (end - self))._grad_sum_to_size(weight_size)
return grad_self, grad_end, grad_weight
return result, backward
def reshape(self,
shape: List[int]):
self_size = self.size()
def backward(grad_output):
return grad_output.reshape(self_size), None
return torch.reshape(self, shape), backward
def split(self,
split_size: int,
dim: int):
def backward(grad_outputs: List[Tensor]):
grad_self = torch.cat(grad_outputs, dim)
return grad_self, None, None
return torch.split(self, split_size, dim), backward
def split_with_sizes(self,
split_sizes: List[int],
dim: int):
def backward(grad_outputs: List[Tensor]):
size = len(grad_outputs)
grad_self = torch.cat(grad_outputs, dim)
return grad_self, None, None
return torch.split_with_sizes(self, split_sizes, dim), backward
def stack(tensors: List[Tensor],
dim: int=0):
def backward(grad_output):
grad_tensors = torch.unbind(grad_output, dim)
return grad_tensors, None
return torch.stack(tensors, dim), backward
def unbind(self,
dim: int):
def backward(grad_outputs: List[Tensor]):
grad_self = torch.stack(grad_outputs, dim)
return grad_self, None
return torch.unbind(self, dim), backward
def cat(tensors: List[Tensor],
dim: int):
size = len(tensors)
split_sizes = [0] * size
for i in range(size):
if tensors[i].size() != [0]:
split_sizes[i] = tensors[i].size()[dim]
def backward(grad_output):
grad_tensors = torch.split_with_sizes(grad_output, split_sizes, dim)
return grad_tensors, None
return torch.cat(tensors, dim), backward
def index(self,
indices: List[Tensor]):
def backward(grad_output):
grad_self = torch.zeros_like(self, memory_format=1).index_put_(indices, grad_output, True)
return grad_self, None
return torch.index(self, indices), backward
def meshgrid(tensors: List[Tensor]):
size = len(tensors)
sizes = [0] * size
for i in range(size):
if tensors[i].dim() != 0:
sizes[i] = tensors[i].size()[0]
def backward(grad_outputs: List[Tensor]):
grads_tensors = []
for i in range(size):
view_shape = [1] * size
if sizes[i] == 0:
view_shape[i] = 1
grads_tensors.append((grad_outputs[i]._grad_sum_to_size(view_shape)).reshape(()))
else:
view_shape[i] = sizes[i]
grads_tensors.append((grad_outputs[i]._grad_sum_to_size(view_shape)).reshape([sizes[i]]))
return grads_tensors
return torch.meshgrid(tensors), backward
def mv(self, vec):
def backward(grad_output):
return grad_output.ger(vec), self.t().mv(grad_output)
return torch.mv(self, vec), backward
def nonzero(self):
def backward(grad_output):
return None
return torch.nonzero(self), backward
def ones_like(self):
def backward(grad_output):
return None
return torch.ones_like(self, memory_format=1), backward
def pow_0(self,
exponent: number):
def backward(grad_output):
if float(exponent) == 0.0:
grad_self = torch.zeros_like(self, memory_format=1)
else:
grad_self = grad_output * exponent * torch.pow(self, float(exponent) - 1)
return grad_self, None
return torch.pow(self, exponent), backward
def pow_1(self, exponent):
result = torch.pow(self, exponent)
self_size = torch._size_if_not_equal(self.size(), result.size())
exponent_size = torch._size_if_not_equal(exponent.size(), result.size())
def backward(grad_output):
grad_self = torch.where(exponent == 0.0, torch.zeros_like(self, memory_format=1), grad_output * exponent * torch.pow(self, exponent - 1))._grad_sum_to_size(self_size)
grad_exponent = (grad_output * torch.pow(self, exponent) * torch.log(self))._grad_sum_to_size(exponent_size)
return grad_self, grad_exponent
return result, backward
def pow_2(self: number,
exponent):
def backward(grad_output):
grad_exponent = grad_output * torch.pow(self, exponent) * torch.log(float(self))
return None, grad_exponent
return torch.pow(self, exponent), backward
def rsub_0(self,
other,
alpha: number):
result = torch.rsub(self, other, alpha=alpha)
self_size = torch._size_if_not_equal(self.size(), result.size())
other_size = torch._size_if_not_equal(other.size(), result.size())
def backward(grad_output):
grad_self = (- grad_output * alpha)._grad_sum_to_size(self_size)
grad_other = (grad_output)._grad_sum_to_size(other_size)
return grad_self, grad_other, None
return result, backward
def rsub_1(self,
other: number,
alpha: number):
def backward(grad_output):
grad_self = (- grad_output * alpha)
return grad_self, None, None
return torch.rsub(self, other, alpha), backward
def sqrt(self):
result = torch.sqrt(self)
def backward(grad_output):
return grad_output / (2 * result)
return result, backward
def t(self):
def backward(grad_output):
return torch.t(grad_output)
return torch.t(self), backward
def to_0(self,
device: Optional[Device],
dtype: Optional[int],
non_blocking: bool,
copy: bool):
self_device = self.device
self_dtype = self.dtype
if device is not None:
result = self.to(device, dtype=dtype, non_blocking=non_blocking, copy=copy)
else:
result = self.to(dtype, non_blocking=non_blocking, copy=copy)
def backward(grad_output):
grad_self = grad_output.to(self_device, dtype=self_dtype, non_blocking=non_blocking, copy=copy)
return grad_self, None, None, None, None
return result, backward
def to_1(self,
dtype: int,
non_blocking: bool,
copy: bool):
self_dtype = self.dtype
def backward(grad_output):
grad_self = grad_output.to(self_dtype, non_blocking, copy)
return grad_self, None, None, None
return self.to(dtype=dtype, non_blocking=non_blocking, copy=copy), backward
def to_2(self,
other,
non_blocking: bool,
copy: bool):
def backward(grad_output):
grad_self = grad_output.to(self, non_blocking, copy)
return grad_self, None, None, None
return self.to(other, non_blocking=non_blocking, copy=copy), backward
def transpose(self,
dim0: int,
dim1: int):
def backward(grad_output):
return torch.transpose(grad_output, dim0, dim1), None, None
return torch.transpose(self, dim0, dim1), backward
def view(self,
size: List[int]):
self_size = self.size()
def backward(grad_output):
return grad_output.reshape(self_size), None
return torch.view(self, size), backward
)",
R"(
def AD_sizes_if_not_equal_multi_0(t1, t2, res):
return torch._size_if_not_equal(t1.size(), res.size()), torch._size_if_not_equal(t2.size(), res.size())
def mul_0(self, other):
result = self * other
self_size, other_size = AD_sizes_if_not_equal_multi_0(self, other, result)
def backward(grad_output):
grad_self = (grad_output * other)._grad_sum_to_size(self_size)
grad_other = (grad_output * self)._grad_sum_to_size(other_size)
return grad_self, grad_other
return result, backward
def mul_1(self, other: number):
def backward(grad_output):
return grad_output * other, None
return self * other, backward
def div_0(self, other):
result = self / other
self_size, other_size = AD_sizes_if_not_equal_multi_0(self, other, result)
def backward(grad_output):
grad_self = (grad_output / other)._grad_sum_to_size(self_size)
grad_other = (-grad_output * self / (other * other))._grad_sum_to_size(other_size)
return grad_self, grad_other
return result, backward
def div_1(self, other: number):
def backward(grad_output):
return grad_output / other, None
return self / other, backward
def div_2(self, other, *, rounding_mode: Optional[str]):
result = torch.div(self, other, rounding_mode=rounding_mode)
self_size, other_size = AD_sizes_if_not_equal_multi_0(self, other, result)
def backward(grad_output):
if rounding_mode is None:
grad_self = (grad_output / other)._grad_sum_to_size(self_size)
grad_other = (-grad_output * self / (other * other))._grad_sum_to_size(other_size)
else:
grad_self = torch.zeros_like(self)
grad_other = torch.zeros_like(other)
return grad_self, grad_other, None
return result, backward
def div_3(self, other: number, *, rounding_mode: Optional[str]):
result = torch.div(self, other, rounding_mode=rounding_mode)
def backward(grad_output):
if rounding_mode is None:
grad_self = (grad_output / other)
else:
grad_self = torch.zeros_like(self, memory_format=1)
return grad_self, None, None
return result, backward
def max(self, other):
result = torch.max(self, other)
self_size, other_size = AD_sizes_if_not_equal_multi_0(self, other, result)
def backward(grad_output):
grad_self = (grad_output * (self > other).type_as(grad_output))._grad_sum_to_size(self_size)
grad_other = (grad_output * (other > self).type_as(grad_output))._grad_sum_to_size(other_size)
return grad_self, grad_other
return result, backward
def min(self, other):
def backward(grad_output):
grad_self = (grad_output * (self < other).type_as(grad_output))._grad_sum_to_size(self.size())
grad_other = (grad_output * (other < self).type_as(grad_output))._grad_sum_to_size(other.size())
return grad_self, grad_other
return torch.min(self, other), backward
def sigmoid(self):
result = torch.sigmoid(self)
def backward(grad_output):
return (1 - result) * result * grad_output
return result, backward
# Share backward with threshold
def relu(self):
result = torch.relu(self)
def backward(grad_output):
return grad_output * (result > 0).type_as(result)
return result, backward
def relu6(self):
result = torch.relu6(self)
def backward(grad_output):
return grad_output * ((result > 0) & (result < 6.0))
return result, backward
def leaky_relu(self, negative_slope: number):
result = torch.leaky_relu(self, negative_slope)
def backward(grad_output):
return grad_output * torch.where(self > 0, 1.0, negative_slope).type_as(result), None
return result, backward
def gelu(self : Tensor, *, approximate : str):
result = torch.gelu(self, approximate=approximate)
def backward(grad_output):
return torch.gelu_backward(grad_output, self, approximate=approximate), None
return result, backward
def silu(self):
result = torch.silu(self)
def backward(grad_output):
input_sigmoid = torch.sigmoid(self)
return grad_output * (input_sigmoid * (1 + self * (1 - input_sigmoid)))
return result, backward
def hardswish(self):
result = torch.hardswish(self)
def backward(grad_output):
m = (self > 3.).type_as(result)
m = torch.where((self >= -3.) & (self <= 3.), self / 3. + .5, m)
return grad_output * m
return result, backward
def hardsigmoid(self):
result = torch.hardsigmoid(self)
def backward(grad_output):
m = (self > -3.) & (self < 3.)
lhs = grad_output * (1.0 / 6.0)
return torch.where(m, lhs, m.type_as(self))
return result, backward
def erfc(self):
def backward(grad_output):
# Precomputed constant C = -2.0 / math.sqrt(math.pi)
C = -1.1283791670955126
return C * torch.exp(-self * self) * grad_output
return torch.erfc(self), backward
def exp(self):
result = torch.exp(self)
def backward(grad_output):
return grad_output * result
return result, backward
def neg(self):
def backward(grad_output):
return grad_output.neg()
return torch.neg(self), backward
def where(condition, self, other):
result = torch.where(condition, self, other)
self_size, other_size = AD_sizes_if_not_equal_multi_0(self, other, result)
def backward(grad_output):
grad_self = (grad_output * condition.type_as(grad_output))._grad_sum_to_size(self_size)
grad_other = (grad_output * (condition.bitwise_not()).type_as(grad_output))._grad_sum_to_size(other_size)
return None, grad_self, grad_other
return result, backward
def type_as(self, other):
def backward(grad_output):
return grad_output.type_as(self), None
return torch.type_as(self, other), backward
def unsqueeze(self, dim: int):
def backward(grad_output):
return grad_output.squeeze(dim), None
return torch.unsqueeze(self, dim), backward
def abs(self):
def backward(grad_output):
return grad_output * self.sign()
return torch.abs(self), backward