1 /*
2 * Copyright (c) Meta Platforms, Inc. and affiliates.
3 * All rights reserved.
4 *
5 * This source code is licensed under the BSD-style license found in the
6 * LICENSE file in the root directory of this source tree.
7 */
8
9 #include <cmath>
10 #include <cstring>
11
12 #include <executorch/kernels/portable/cpu/util/functional_util.h>
13 #include <executorch/runtime/kernel/kernel_includes.h>
14 #include <executorch/runtime/platform/assert.h>
15
16 namespace torch {
17 namespace executor {
18 namespace native {
19
20 using exec_aten::Tensor;
21
sign_out(KernelRuntimeContext & ctx,const Tensor & in,Tensor & out)22 Tensor& sign_out(KernelRuntimeContext& ctx, const Tensor& in, Tensor& out) {
23 (void)ctx;
24
25 // Resize for dynamic shape
26 ET_KERNEL_CHECK_MSG(
27 ctx,
28 resize_tensor(out, in.sizes()) == Error::Ok,
29 InvalidArgument,
30 out,
31 "Failed to resize output tensor.");
32
33 ET_KERNEL_CHECK(
34 ctx, tensors_have_same_dim_order(in, out), InvalidArgument, out);
35
36 ET_KERNEL_CHECK(
37 ctx, tensors_have_same_shape_and_dtype(in, out), InvalidArgument, out);
38
39 if (in.scalar_type() == exec_aten::ScalarType::Bool) {
40 memcpy(out.mutable_data_ptr(), in.const_data_ptr(), in.nbytes());
41 } else {
42 ET_SWITCH_REAL_TYPES(in.scalar_type(), ctx, "sign.out", CTYPE, [&] {
43 apply_unary_map_fn(
44 [](const CTYPE val_in) {
45 if (std::isnan(val_in)) {
46 return val_in;
47 } else {
48 return static_cast<CTYPE>((val_in > 0) - (val_in < 0));
49 }
50 },
51 in.const_data_ptr<CTYPE>(),
52 out.mutable_data_ptr<CTYPE>(),
53 in.numel());
54 });
55 }
56
57 return out;
58 }
59
60 } // namespace native
61 } // namespace executor
62 } // namespace torch
63