Making them trivially copyable allows using std::memcpy() without undefined
behaviors.
Only Matrix and Array with trivially copyable DenseStorage are marked as
trivially copyable with an additional type trait.
As described in http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p0848r3.html
it requires extremely verbose SFINAE to make the special member functions of
fixed-size Matrix and Array trivial, unless C++20 concepts are available to
simplify the selection of trivial special member functions given template
parameters. Therefore only make this feature available to compilers that support
C++20 P0848R3.
Fix#1855.
- The current implementation computes `size + total_threads`, which can
overflow and cause CUDA_ERROR_ILLEGAL_ADDRESS when size is close to
the maximum representable value.
- The num_blocks calculation can also overflow due to the implementation
of divup().
- This patch prevents these overflows and allows the kernel to work
correctly for the full representable range of tensor sizes.
- Also adds relevant tests.
For some reason, having `take<n, numeric_list<T>>` for `n > 0` causes
g++-11 to ICE with
```
sorry, unimplemented: unexpected AST of kind nontype_argument_pack
```
It does work with other versions of gcc, and with clang.
I filed a GCC bug
[here](https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102999).
Technically we should never actually run into this case, since you
can't take n > 0 elements from an empty list. Commenting it out
allows our Eigen tests to pass.
The sum accuracy test currently uses the default test precision for
the given scalar type. However, scalars are generated via a normal
distribution, and given a large enough count and strong enough random
generator, the expected sum is zero. This causes the test to
periodically fail.
Here we estimate an upper-bound for the error as `sqrt(N) * prec` for
summing N values, with each having an approximate epsilon of `prec`.
Also fixed a few warnings generated by MSVC when compiling the
reduction test.
reducer0.reducePacket(accum1, accum0);
reducer0.reducePacket(accum2, accum0);
reducer0.reducePacket(accum3, accum0);
For the mean reducer this will increment the count as well as adding together the accumulators and result in the wrong count being divided into the sum at the end.
- The current implementation computes `size + total_threads`, which can
overflow and cause CUDA_ERROR_ILLEGAL_ADDRESS when size is close to
the maximum representable value.
- The num_blocks calculation can also overflow due to the implementation
of divup().
- This patch prevents these overflows and allows the kernel to work
correctly for the full representable range of tensor sizes.
- Also adds relevant tests.
For vectorized 1-dimensional inputs that do not take the special
blocking path (e.g. `std::complex<...>`), there was an
index-out-of-bounds error causing the broadcast size to be
computed incorrectly. Here we fix this, and make other minor
cleanup changes.
Fixes#2351.
& and | short-circuit, && and || don't. When both arguments to those
are boolean, the short-circuiting version is usually the desired one, so
clang warns on this.
Here, it is inconsequential, so switch to && and || to suppress the warning.
For moderately sized inputs, running the Tree reduction quickly
fills/overflows the GPU thread stack space, leading to memory errors.
This was happening in the `cxx11_tensor_complex_gpu` test, for example.
Disabling tree reduction on GPU fixes this.
The `Complex.h` file applies equally to HIP/CUDA, so placing under the
generic `GPU` folder.
The `TensorReductionCuda.h` has already been deprecated, now removing
for the next Eigen version.
clang-tidy: Return type 'const T' is 'const'-qualified at the top level,
which may reduce code readability without improving const correctness
The types are somewhat long, but the affected return types are of the form:
```
const T my_func() { /**/ }
```
Change to:
```
T my_func() { /**/ }
```
This is to make way for a new `Tuple` class that mimics `std::tuple`,
but can be reliably used on device and with aligned Eigen types.
The existing Tuple has very few references, and is actually an
analogue of `std::pair`.
All cuda `__half` functions are device-only in CUDA 9, including
conversions. Host-side conversions were added in CUDA 10.
The existing code doesn't build prior to 10.0.
All arithmetic functions are always device-only, so there's
therefore no reason to use vectorization on the host at all.
Modified the code to disable vectorization for `__half` on host,
which required also updating the `TensorReductionGpu` implementation
which previously made assumptions about available packets.
The original `fill` implementation introduced a 5x regression on my
nvidia Quadro K1200. @rohitsan reported up to 100x regression for
HIP. This restores performance.
For custom scalars, zero is not necessarily represented by
a zeroed-out memory block (e.g. gnu MPFR). We therefore
cannot rely on `memset` if we want to fill a matrix or tensor
with zeroes. Instead, we should rely on `fill`, which for trivial
types does end up getting converted to a `memset` under-the-hood
(at least with gcc/clang).
Requires adding a `fill(begin, end, v)` to `TensorDevice`.
Replaced all potentially bad instances of memset with fill.
Fixes#2245.
The extra [TOC] tag is generating a huge floating duplicated
table-of-contents, which obscures the majority of the page
(see bottom of https://eigen.tuxfamily.org/dox/unsupported/eigen_tensors.html).
Remove it.
Also, headers do not support markup (see
[doxygen bug](https://github.com/doxygen/doxygen/issues/7467)), so
backticks like
```
```
end up generating titles that looks like
```
Constructor <tt>Tensor<double,2></tt>
```
Removing backticks for now. To generate proper formatted headers, we
must directly use html instead of markdown, i.e.
```
<h2>Constructor <code>Tensor<double,2></code></h2>
```
which is ugly.
Fixes#2254.
- Move constructors can only be defaulted as NOEXCEPT if all members
have NOEXCEPT move constructors.
- gcc 4.8 has some funny parsing bug in `a < b->c`, thinking `b-` is a template parameter.
As written, depending on multithreading/gpu, the returned index from
`argmin`/`argmax` is not currently stable. Here we modify the functors
to always keep the first occurence (i.e. if the value is equal to the
current min/max, then keep the one with the smallest index).
This is otherwise causing unpredictable results in some TF tests.
Currently TF lite needs to hack around with the Tensor headers in order
to customize the contraction dispatch method. Here we add simple `#ifndef`
guards to allow them to provide their own dispatch prior to inclusion.
Made a class and singleton to encapsulate initialization and retrieval of
device properties.
Related to !481, which already changed the API to address a static
linkage issue.
Time-dependence prevents tests from being repeatable. This has long
been an issue with debugging the tensor tests. Removing this will allow
future tests to be repeatable in the usual way.
Also, the recently added macros in !476 are causing headaches across different
platforms. For example, checking `_XOPEN_SOURCE` is leading to multiple
ambiguous macro errors across Google, and `_DEFAULT_SOURCE`/`_SVID_SOURCE`/`_BSD_SOURCE`
are sometimes defined with values, sometimes defined as empty, and sometimes
not defined at all when they probably should be. This is leading to
multiple build breakages.
The simplest approach is to generate a seed via
`Eigen::internal::random<uint64_t>()` if on CPU. For GPU, we use a
hash based on the current thread ID (since `rand()` isn't supported
on GPU).
Fixes#1602.
m_deviceProperties and m_devicePropInitialized are defined as global
statics which will define multiple copies which can cause issues if
initializeDeviceProp() is called in one translation unit and then
m_deviceProperties is used in a different translation unit. Added
inline functions getDeviceProperties() and getDevicePropInitialized()
which defines those variables as static locals. As per the C++ standard
7.1.2/4, a static local declared in an inline function always refers
to the same object, so this should be safer. Credit to Sun Chenggen
for this fix.
This fixes issue #1475.
`TensorRandom` currently relies on BSD `random()`, which is not always
available. The [linux manpage](https://man7.org/linux/man-pages/man3/srandom.3.html)
gives the glibc condition:
```
_XOPEN_SOURCE >= 500
|| /* Glibc since 2.19: */ _DEFAULT_SOURCE
|| /* Glibc <= 2.19: */ _SVID_SOURCE || _BSD_SOURCE
```
In particular, this was failing to compile for MinGW via msys2. If not
available, we fall back to using `rand()`.
The namespace declaration for googlehash is a configurable macro that
can be disabled. In particular, it is disabled within google, causing
compile errors since `dense_hash_map`/`sparse_hash_map` are then in
the global namespace instead of in `::google`.
Here we play a bit of gynastics to allow for both `google::*_hash_map`
and `*_hash_map`, while limiting namespace polution. Symbols within
the `::google` namespace are imported into `Eigen::google`.
We also remove checks based on `_SPARSE_HASH_MAP_H_`, as this is
fragile, and instead require `EIGEN_GOOGLEHASH_SUPPORT` to be
defined.
