Taichi: v0.7.0 Roadmap

[yuanming-hu]

• [x] Obsolete ti.classfunc and ti.classkernel (lead: @k-ye)
• [x] Thread-local storage IR (lead: @yuanming-hu)
• [x] Run examples from CLI (#775)
• [x] Tune the performance of the LLVM backend to match that of the legacy source-to-source backends (lead: @yuanming-hu, test case: taichi_elements)
• [x] Standardize Taichi's math library (#833, lead: @archibate)
• [x] Upgrade to LLVM 10 (#655)
• [x] Set up codecov for Python (#1195, lead: @archibate)
• [x] Deprecate ti.var, use ti.field instead (#1500, lead: @Rullec, @archibate)
• [x] Ship the C backend (#1644, lead @archibate)
• [x] Enforce Unix line endings (#1675)

[archibate]

Restore vectorization on CPUs

Vectorization? This may also apply to GLSL since it provides vec3 or vec4 just like mmintrin's on x64 CPU. Not sure if this have any performance boost compared to non-vec ones on GL.

Restore automatic shared memory utilization on GPUs

Is this specific to CUDA? Or may also applied to Metal&OpenGL backend?

[archibate]

Also add real function support #602

[yuanming-hu]

Vectorization? This may also apply to GLSL since it provides vec3 or vec4 just like mmintrin's on x64 CPU. Not sure if this have any performance boost compared to non-vec ones on GL.

vec3/4 in OpenGL is not really vectorization - they are still represented by a few 32-bit registers instead of a wide SIMD register.

Restore automatic shared memory utilization on GPUs

Is this specific to CUDA? Or may also applied to Metal&OpenGL backend?

Good point. In the future, we should do this for other GPU backends with shared memory support as well.

[k-ye]

Good point. In the future, we should do this for other GPU backends with shared memory support as well.

Coming late on this. Metal does support shared memory as well. So if this optimization can be expressed at the CHI level, it should be do-able on Metal..

[archibate]

@yuanming-hu Hi, what's the progress? Would you update the 'ticks' in issue description?

[yuanming-hu]

@yuanming-hu Hi, what's the progress? Would you update the 'ticks' in issue description?

Sorry I got too swamped recently. I updated the issue. I think v0.7 can be released soon. Let's use v0.7 to celebrate a lot of language standardization, as well as the C source&JS/WASM backends!

[archibate]

Let's use v0.7 to celebrate a lot of language standardization, as well as the C source&JS/WASM backends!

Finally! Would you check out #1644 and add -DTI_WITH_CC:BOOL=ON to Jeksinfile so that people could play with it in v0.7.0?
@Rullec and me will further make end-user visible refactor in #1500, hopefully it could be released in next week :)

[Rullec]

I will try to achieve it as well ;-)

彭于斌 [e-mail] 于2020年8月11日周二 下午11:38写道：

Let's use v0.7 to celebrate a lot of language standardization, as well as
the C source&JS/WASM backends!

Finally! Would you check out #1644
https://github.com/taichi-dev/taichi/issues/1644 and add
-DTI_WITH_CC:BOOL=ON to Jeksinfile so that people could play with it in
v0.7.0?
@Rullec https://github.com/Rullec and me will further make end-user
visible refactor in #1500
https://github.com/taichi-dev/taichi/issues/1500, hopefully it could be
released in next week :)

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[yuanming-hu]

Let's use v0.7 to celebrate a lot of language standardization, as well as the C source&JS/WASM backends!

Finally! Would you check out #1644 and add -DTI_WITH_CC:BOOL=ON to Jeksinfile so that people could play with it in v0.7.0?
@Rullec and me will further make end-user visible refactor in #1500, hopefully it could be released in next week :)

We can make TI_WITH_CC=ON by default.

Although we are very close, I don't think next week is a reasonable plan. Maybe two weeks sound more reasonable. There are still a lot of clean-up jobs to do.

[Rullec]

Hi all,
So I came back to this roadmap again after my refactor work finished.
Cleaner codes are really scented, so I'm quite interested in these cpplint and pylint items and the Move to multi-pass Python AST transformer item. Do you need / May I offer some helps on them?

[archibate]

cpplint and pylint

Yes, if you're familiar about them or having free time :>

Move to multi-pass Python AST transformer

In fact the current AST transformer is so dedicated that even me didn't dear to refactor easily.. but ff2 contribute if you're familiar with Python's built-in ast module.

[yuanming-hu]

Hi all,
So I came back to this roadmap again after my refactor work finished.
Cleaner codes are really scented, so I'm quite interested in these cpplint and pylint items and the Move to multi-pass Python AST transformer item. Do you need / May I offer some helps on them?

I believe pylint would be a very nice thing to have :-) That will help us significantly improve Python code quality. Please feel free to open an issue to track this. Thank you so much! (I believe @k-ye may have something to say about this - he seems to be using pylint offline already.)

cpplint is good too, but I did some initial investigation and found no tool that supports C++17.

[Headcrabed]

Does "AMDGPU backend" means Taichi would support OpenCL?

[Rullec]

cpplint and pylint

Yes, if you're familiar about them or having free time :>

Move to multi-pass Python AST transformer

In fact the current AST transformer is so dedicated that even me didn't dear to refactor easily.. but ff2 contribute if you're familiar with Python's built-in ast module.

Hi all,
So I came back to this roadmap again after my refactor work finished.
Cleaner codes are really scented, so I'm quite interested in these cpplint and pylint items and the Move to multi-pass Python AST transformer item. Do you need / May I offer some helps on them?

I believe pylint would be a very nice thing to have :-) That will help us significantly improve Python code quality. Please feel free to open an issue to track this. Thank you so much! (I believe @k-ye may have something to say about this - he seems to be using pylint offline already.)

cpplint is good too, but I did some initial investigation and found no tool that supports C++17.

So sorry for my late reply till today! To be honest, I failed to receive the notifications both in the emails and the website from github untill checking this issue manually today

I will begin my work on the python linter soon, thanks for all your reply!

[yuanming-hu]

Does "AMDGPU backend" means Taichi would support OpenCL?

@Headcrabed OpenCL is a different thing. AMDGPU here refers to AMD ROCm :-)

I will begin my work on the python linter soon, thanks for all your reply!

Oh actually @archibate has already done the first step in https://github.com/taichi-dev/taichi/pull/1846 - could you help to review? Thanks! In the future, we may want to gradually improve Python code quality, partly following the messages from pylint.

[rexwangcc]

When it comes to improving the code quality, I personally think black is a better solution over yapf which provides a subset of PEP8 styles as well as lint+format functionality commands and more and more widely adopted. But looking at #592, I guess that ship has sailed 🚢 ..

[Headcrabed]

Does "AMDGPU backend" means Taichi would support OpenCL?

@Headcrabed OpenCL is a different thing. AMDGPU here refers to AMD ROCm :-)

>
Thanks for your reply, by the way have you thought about adding OpenCL support into future roadmap? Since many people still use Windows for creating artworks, I think add support for it is of importance.(ROCm hasn't supported Windows and RDNA GPUs now and AMD didn't say anything about this)

[yuanming-hu]

@rexwangcc Does black cover the jobs of both yapf and pylint? From the README from black, it feels like a code formatted instead of static analyzer :-) Not sure what linting means in black.

Thanks for your reply, by the way have you thought about adding OpenCL support into future roadmap? Since many people still use Windows for creating artworks, I think add support for it is of importance.(ROCm hasn't supported Windows and RDNA GPUs now and AMD didn't say anything about this)

@Headcrabed Yes, OpenCL is on our roadmap, but we are waiting for a brave and passionate contributor. The OpenCL backend should generate OpenCL source, just like the OpenGL Compute Shader backend (https://github.com/taichi-dev/taichi/tree/master/taichi/backends/opengl). We are also considering Vulkan.

[rexwangcc]

@yuanming-hu Thinking about Taichi's requirements again and looking at the latest Black, I'd take it back...

I think Taichi's goal from the code quality perspective is to have a custom set of PEP8 rules and configure it properly so Pylint works as a static analyzer that boosts developers' velocity, while Black is designed to be an opinonated zero-config formatter that forces a pre-defined set of styles on your code base: it just provides black ./(formatter) and black ./ --check (linter, but not as a pylint equivalence) which used to work well. Since it looks like Black's code style is diverging from PEP8 now, I think we can omit that option. (please correct me if I'm wrong here)

[yuanming-hu]

Update: we will bump to v0.7 this weekend.

[archibate]

Great, will we obsolete functions like ti.classkernel and ti.outer_product in this version?

[yuanming-hu]

Yes :-)

Btw, it seems to me that ti.var no longer generates a warning. Could you please take a look into that?

[archibate]

Yes :-)

Btw, it seems to me that ti.var no longer generates a warning. Could you please take a look into that?

Oh, really? I can't reproduce that in latest release:

Python 3.8.5 (tags/v3.8.5:580fbb0, Jul 20 2020, 15:57:54) [MSC v.1924 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license()" for more information.
>>> import taichi as ti
[Taichi] mode=release
[Taichi] version 0.6.41, llvm 10.0.0, commit 706c5196, win, python 3.8.5
>>> x = ti.var(ti.f32, ())

Warning (from warnings module):
  File "<pyshell#1>", line 1
DeprecationWarning: ti.var is deprecated, please use ti.field instead
ti.var 已被废除，请使用 ti.field 来替换
>>> x
<ti.field>
>>> 

[yuanming-hu]

A lot of thanks to everyone who has contributed to v0.7!
We will write an official post to celebrate this new minor version release.

This issue is superseded by #1989 and #1988.