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[GitHub] [tvm-rfcs] areusch commented on a change in pull request #28: Command Line Composition from Internal Registry
areusch commented on a change in pull request #28:
URL: https://github.com/apache/tvm-rfcs/pull/28#discussion_r714108829
##########
File path: rfcs/0028-command-line-registry-composition.md
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@@ -0,0 +1,153 @@
+- Feature Name: Command Line Composition from Internal Registry
+- Start Date: 2021-08-24
+- RFC PR: [apache/tvm-rfcs#28](https://github.com/apache/tvm-rfcs/pull/28)
+- GitHub Issue: [apache/tvm#0000](https://github.com/apache/tvm/issues/0000)
+
+# Summary
+[summary]: #summary
+
+Introducing a standardised form for `tvmc` arguments to be populated from internal registries in TVM.
+
+# Motivation
+[motivation]: #motivation
+
+Currently, when a user uses `tvmc`, they present a target string:
+```
+tvmc --target="woofles -mcpu=woof, c -mattr=+mwoof"
+```
+
+Using a target string here means that the entire `--target` argument is used as an opaque pass-through to the internal `Target` string parser. Users coming to TVM should be able to compose these options and get meaningful help when doing that composition with `tvmc`. As an example, using the default `argparse` behaviour, the arguments can be registered as follows:
Review comment:
let us motivate composition of Target a bit further. what use case are we trying to support? what user burden are we trying to alleviate?
##########
File path: rfcs/0028-command-line-registry-composition.md
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@@ -0,0 +1,153 @@
+- Feature Name: Command Line Composition from Internal Registry
+- Start Date: 2021-08-24
+- RFC PR: [apache/tvm-rfcs#28](https://github.com/apache/tvm-rfcs/pull/28)
+- GitHub Issue: [apache/tvm#0000](https://github.com/apache/tvm/issues/0000)
+
+# Summary
+[summary]: #summary
+
+Introducing a standardised form for `tvmc` arguments to be populated from internal registries in TVM.
+
+# Motivation
+[motivation]: #motivation
+
+Currently, when a user uses `tvmc`, they present a target string:
+```
+tvmc --target="woofles -mcpu=woof, c -mattr=+mwoof"
+```
+
+Using a target string here means that the entire `--target` argument is used as an opaque pass-through to the internal `Target` string parser. Users coming to TVM should be able to compose these options and get meaningful help when doing that composition with `tvmc`. As an example, using the default `argparse` behaviour, the arguments can be registered as follows:
+```python
+import argparse
+parser = argparse.ArgumentParser(formatter_class=argparse.ArgumentDefaultsHelpFormatter)
+parser.add_argument('--target', type=str, help='comma separated target list or target string')
+
+target_c = parser.add_argument_group('target c')
+target_c.add_argument('--target-c-mcpu', type=str, help='target c mcpu string')
+target_c.add_argument('--target-c-mattr', type=str, help='target c mattr string')
+
+target_llvm = parser.add_argument_group('target llvm')
+target_llvm.add_argument('--target-llvm-mcpu', type=str, help='target llvm mcpu string')
+target_llvm.add_argument('--target-llvm-mattr', type=str, help='target lvm mattr string')
+
+args = parser.parse_args()
+print(args)
+```
+
+The user can get help for all available target options:
+```
+usage: test.py [-h] [--target TARGET] [--target-c-mcpu TARGET_C_MCPU] [--target-c-mattr TARGET_C_MATTR] [--target-llvm-mcpu TARGET_LLVM_MCPU] [--target-llvm-mattr TARGET_LLVM_MATTR]
+
+optional arguments:
+ -h, --help show this help message and exit
+ --target TARGET comma separated target list or target string (default: None)
+
+target c:
+ --target-c-mcpu TARGET_C_MCPU
+ target c mcpu string (default: None)
Review comment:
it seems as though if we are going to do this, we need to supply descriptions for all of these. we should address the question of where those descriptions come from in this PR.
##########
File path: rfcs/0028-command-line-registry-composition.md
##########
@@ -0,0 +1,153 @@
+- Feature Name: Command Line Composition from Internal Registry
+- Start Date: 2021-08-24
+- RFC PR: [apache/tvm-rfcs#28](https://github.com/apache/tvm-rfcs/pull/28)
+- GitHub Issue: [apache/tvm#0000](https://github.com/apache/tvm/issues/0000)
+
+# Summary
+[summary]: #summary
+
+Introducing a standardised form for `tvmc` arguments to be populated from internal registries in TVM.
+
+# Motivation
+[motivation]: #motivation
+
+Currently, when a user uses `tvmc`, they present a target string:
+```
+tvmc --target="woofles -mcpu=woof, c -mattr=+mwoof"
+```
+
+Using a target string here means that the entire `--target` argument is used as an opaque pass-through to the internal `Target` string parser. Users coming to TVM should be able to compose these options and get meaningful help when doing that composition with `tvmc`. As an example, using the default `argparse` behaviour, the arguments can be registered as follows:
+```python
+import argparse
+parser = argparse.ArgumentParser(formatter_class=argparse.ArgumentDefaultsHelpFormatter)
+parser.add_argument('--target', type=str, help='comma separated target list or target string')
+
+target_c = parser.add_argument_group('target c')
+target_c.add_argument('--target-c-mcpu', type=str, help='target c mcpu string')
+target_c.add_argument('--target-c-mattr', type=str, help='target c mattr string')
+
+target_llvm = parser.add_argument_group('target llvm')
+target_llvm.add_argument('--target-llvm-mcpu', type=str, help='target llvm mcpu string')
+target_llvm.add_argument('--target-llvm-mattr', type=str, help='target lvm mattr string')
+
+args = parser.parse_args()
+print(args)
+```
+
+The user can get help for all available target options:
+```
+usage: test.py [-h] [--target TARGET] [--target-c-mcpu TARGET_C_MCPU] [--target-c-mattr TARGET_C_MATTR] [--target-llvm-mcpu TARGET_LLVM_MCPU] [--target-llvm-mattr TARGET_LLVM_MATTR]
+
+optional arguments:
+ -h, --help show this help message and exit
+ --target TARGET comma separated target list or target string (default: None)
Review comment:
it's a little confusing to have both. how do they compose?
##########
File path: rfcs/0028-command-line-registry-composition.md
##########
@@ -0,0 +1,153 @@
+- Feature Name: Command Line Composition from Internal Registry
+- Start Date: 2021-08-24
+- RFC PR: [apache/tvm-rfcs#28](https://github.com/apache/tvm-rfcs/pull/28)
+- GitHub Issue: [apache/tvm#0000](https://github.com/apache/tvm/issues/0000)
+
+# Summary
+[summary]: #summary
+
+Introducing a standardised form for `tvmc` arguments to be populated from internal registries in TVM.
+
+# Motivation
+[motivation]: #motivation
+
+Currently, when a user uses `tvmc`, they present a target string:
+```
+tvmc --target="woofles -mcpu=woof, c -mattr=+mwoof"
+```
+
+Using a target string here means that the entire `--target` argument is used as an opaque pass-through to the internal `Target` string parser. Users coming to TVM should be able to compose these options and get meaningful help when doing that composition with `tvmc`. As an example, using the default `argparse` behaviour, the arguments can be registered as follows:
+```python
+import argparse
+parser = argparse.ArgumentParser(formatter_class=argparse.ArgumentDefaultsHelpFormatter)
+parser.add_argument('--target', type=str, help='comma separated target list or target string')
+
+target_c = parser.add_argument_group('target c')
+target_c.add_argument('--target-c-mcpu', type=str, help='target c mcpu string')
+target_c.add_argument('--target-c-mattr', type=str, help='target c mattr string')
+
+target_llvm = parser.add_argument_group('target llvm')
+target_llvm.add_argument('--target-llvm-mcpu', type=str, help='target llvm mcpu string')
+target_llvm.add_argument('--target-llvm-mattr', type=str, help='target lvm mattr string')
+
+args = parser.parse_args()
+print(args)
+```
+
+The user can get help for all available target options:
+```
+usage: test.py [-h] [--target TARGET] [--target-c-mcpu TARGET_C_MCPU] [--target-c-mattr TARGET_C_MATTR] [--target-llvm-mcpu TARGET_LLVM_MCPU] [--target-llvm-mattr TARGET_LLVM_MATTR]
+
+optional arguments:
+ -h, --help show this help message and exit
+ --target TARGET comma separated target list or target string (default: None)
+
+target c:
+ --target-c-mcpu TARGET_C_MCPU
+ target c mcpu string (default: None)
+ --target-c-mattr TARGET_C_MATTR
+ target c mattr string (default: None)
+
+target llvm:
+ --target-llvm-mcpu TARGET_LLVM_MCPU
+ target llvm mcpu string (default: None)
+ --target-llvm-mattr TARGET_LLVM_MATTR
+ target lvm mattr string (default: None)
+```
+
+These are arranged in per-`Target` groups to allow the user to easily follow which are applicable and which aren't. The use can now replace their existing `Target` string, by using the documented `Target` options, with:
+```
+tvmc --target=woofles,c \
+ --target-woofles-mcpu=woof \
+ --target-c-mattr=+mwoof
+```
+
+# Guide-level explanation
+[guide-level-explanation]: #guide-level-explanation
+
+Alongside support for a target string, `tvmc` would populate a series of other arguments specific to targets which match the attributes found in the TargetKindRegistry in `target_kind.cc`. For example, consider a subset of the `c` `Target`:
+
+```
+TVM_REGISTER_TARGET_KIND("c", kDLCPU)
+ .add_attr_option<String>("mcpu")
+```
+
+This would be translated at the `tvmc` level to:
+```bash
+tvmc --target=c \
+ --target-c-mcpu=cortex-m3
+```
+
+Which would then allow the user to compose together these options, such as:
+
+```bash
+tvmc --target=cmsisnn,c \ # Specifying multiple targets to enable in priority order
Review comment:
what happens if i accidentally include `--target-llvm-mcpu` in this target string?
##########
File path: rfcs/0028-command-line-registry-composition.md
##########
@@ -0,0 +1,153 @@
+- Feature Name: Command Line Composition from Internal Registry
+- Start Date: 2021-08-24
+- RFC PR: [apache/tvm-rfcs#28](https://github.com/apache/tvm-rfcs/pull/28)
+- GitHub Issue: [apache/tvm#0000](https://github.com/apache/tvm/issues/0000)
+
+# Summary
+[summary]: #summary
+
+Introducing a standardised form for `tvmc` arguments to be populated from internal registries in TVM.
+
+# Motivation
+[motivation]: #motivation
+
+Currently, when a user uses `tvmc`, they present a target string:
+```
+tvmc --target="woofles -mcpu=woof, c -mattr=+mwoof"
+```
+
+Using a target string here means that the entire `--target` argument is used as an opaque pass-through to the internal `Target` string parser. Users coming to TVM should be able to compose these options and get meaningful help when doing that composition with `tvmc`. As an example, using the default `argparse` behaviour, the arguments can be registered as follows:
Review comment:
move the argparse code example to Guide-level explanation. i think the example `--help` output could stay as motivation.
##########
File path: rfcs/0028-command-line-registry-composition.md
##########
@@ -0,0 +1,153 @@
+- Feature Name: Command Line Composition from Internal Registry
+- Start Date: 2021-08-24
+- RFC PR: [apache/tvm-rfcs#28](https://github.com/apache/tvm-rfcs/pull/28)
+- GitHub Issue: [apache/tvm#0000](https://github.com/apache/tvm/issues/0000)
+
+# Summary
+[summary]: #summary
+
+Introducing a standardised form for `tvmc` arguments to be populated from internal registries in TVM.
+
+# Motivation
+[motivation]: #motivation
+
+Currently, when a user uses `tvmc`, they present a target string:
+```
+tvmc --target="woofles -mcpu=woof, c -mattr=+mwoof"
+```
+
+Using a target string here means that the entire `--target` argument is used as an opaque pass-through to the internal `Target` string parser. Users coming to TVM should be able to compose these options and get meaningful help when doing that composition with `tvmc`. As an example, using the default `argparse` behaviour, the arguments can be registered as follows:
+```python
+import argparse
+parser = argparse.ArgumentParser(formatter_class=argparse.ArgumentDefaultsHelpFormatter)
+parser.add_argument('--target', type=str, help='comma separated target list or target string')
+
+target_c = parser.add_argument_group('target c')
+target_c.add_argument('--target-c-mcpu', type=str, help='target c mcpu string')
+target_c.add_argument('--target-c-mattr', type=str, help='target c mattr string')
+
+target_llvm = parser.add_argument_group('target llvm')
+target_llvm.add_argument('--target-llvm-mcpu', type=str, help='target llvm mcpu string')
+target_llvm.add_argument('--target-llvm-mattr', type=str, help='target lvm mattr string')
+
+args = parser.parse_args()
+print(args)
+```
+
+The user can get help for all available target options:
+```
+usage: test.py [-h] [--target TARGET] [--target-c-mcpu TARGET_C_MCPU] [--target-c-mattr TARGET_C_MATTR] [--target-llvm-mcpu TARGET_LLVM_MCPU] [--target-llvm-mattr TARGET_LLVM_MATTR]
+
+optional arguments:
+ -h, --help show this help message and exit
+ --target TARGET comma separated target list or target string (default: None)
+
+target c:
+ --target-c-mcpu TARGET_C_MCPU
+ target c mcpu string (default: None)
+ --target-c-mattr TARGET_C_MATTR
+ target c mattr string (default: None)
+
+target llvm:
+ --target-llvm-mcpu TARGET_LLVM_MCPU
+ target llvm mcpu string (default: None)
+ --target-llvm-mattr TARGET_LLVM_MATTR
Review comment:
this one should likely compose if you specify it twice (e.g. `-target-llvm-mattr +fp-armv8` on the command line and `-target-llvm-mattr +neon` in a config file should prooobably compose? If not `mattr`, i'm sure there are target flags which should. how do we differentiate these in parsing?
##########
File path: rfcs/0028-command-line-registry-composition.md
##########
@@ -0,0 +1,153 @@
+- Feature Name: Command Line Composition from Internal Registry
+- Start Date: 2021-08-24
+- RFC PR: [apache/tvm-rfcs#28](https://github.com/apache/tvm-rfcs/pull/28)
+- GitHub Issue: [apache/tvm#0000](https://github.com/apache/tvm/issues/0000)
+
+# Summary
+[summary]: #summary
+
+Introducing a standardised form for `tvmc` arguments to be populated from internal registries in TVM.
+
+# Motivation
+[motivation]: #motivation
+
+Currently, when a user uses `tvmc`, they present a target string:
+```
+tvmc --target="woofles -mcpu=woof, c -mattr=+mwoof"
+```
+
+Using a target string here means that the entire `--target` argument is used as an opaque pass-through to the internal `Target` string parser. Users coming to TVM should be able to compose these options and get meaningful help when doing that composition with `tvmc`. As an example, using the default `argparse` behaviour, the arguments can be registered as follows:
+```python
+import argparse
+parser = argparse.ArgumentParser(formatter_class=argparse.ArgumentDefaultsHelpFormatter)
+parser.add_argument('--target', type=str, help='comma separated target list or target string')
+
+target_c = parser.add_argument_group('target c')
+target_c.add_argument('--target-c-mcpu', type=str, help='target c mcpu string')
+target_c.add_argument('--target-c-mattr', type=str, help='target c mattr string')
+
+target_llvm = parser.add_argument_group('target llvm')
+target_llvm.add_argument('--target-llvm-mcpu', type=str, help='target llvm mcpu string')
+target_llvm.add_argument('--target-llvm-mattr', type=str, help='target lvm mattr string')
+
+args = parser.parse_args()
+print(args)
+```
+
+The user can get help for all available target options:
+```
+usage: test.py [-h] [--target TARGET] [--target-c-mcpu TARGET_C_MCPU] [--target-c-mattr TARGET_C_MATTR] [--target-llvm-mcpu TARGET_LLVM_MCPU] [--target-llvm-mattr TARGET_LLVM_MATTR]
+
+optional arguments:
+ -h, --help show this help message and exit
+ --target TARGET comma separated target list or target string (default: None)
+
+target c:
+ --target-c-mcpu TARGET_C_MCPU
+ target c mcpu string (default: None)
+ --target-c-mattr TARGET_C_MATTR
+ target c mattr string (default: None)
+
+target llvm:
+ --target-llvm-mcpu TARGET_LLVM_MCPU
+ target llvm mcpu string (default: None)
+ --target-llvm-mattr TARGET_LLVM_MATTR
+ target lvm mattr string (default: None)
+```
+
+These are arranged in per-`Target` groups to allow the user to easily follow which are applicable and which aren't. The use can now replace their existing `Target` string, by using the documented `Target` options, with:
+```
+tvmc --target=woofles,c \
+ --target-woofles-mcpu=woof \
+ --target-c-mattr=+mwoof
+```
+
+# Guide-level explanation
+[guide-level-explanation]: #guide-level-explanation
+
+Alongside support for a target string, `tvmc` would populate a series of other arguments specific to targets which match the attributes found in the TargetKindRegistry in `target_kind.cc`. For example, consider a subset of the `c` `Target`:
+
+```
+TVM_REGISTER_TARGET_KIND("c", kDLCPU)
+ .add_attr_option<String>("mcpu")
+```
+
+This would be translated at the `tvmc` level to:
+```bash
+tvmc --target=c \
+ --target-c-mcpu=cortex-m3
+```
+
+Which would then allow the user to compose together these options, such as:
+
+```bash
+tvmc --target=cmsisnn,c \ # Specifying multiple targets to enable in priority order
+ --target-cmsisnn-mattr=+dsp \
+ --target-c-mcpu=cortex-m3
+```
+
+# Reference-level explanation
+[reference-level-explanation]: #reference-level-explanation
+
+There already exists a mechanism which provides Python with `PassConfig` information, via:
+
+```c++
+// Function Registry
+TVM_REGISTER_GLOBAL("transform.ListConfigs").set_body_typed(PassContext::ListConfigs);
+// Actual call
+Map<String, Map<String, String>> PassContext::ListConfigs() {
+ return PassConfigManager::Global()->ListConfigs();
+}
+// Implementation
+Map<String, Map<String, String>> ListConfigs() {
+ Map<String, Map<String, String>> configs;
+ for (const auto& kv : key2vtype_) {
+ Map<String, String> metadata;
+ metadata.Set("type", kv.second.type_key);
+ configs.Set(kv.first, metadata);
+ }
+ return configs;
+}
+```
+
+This can be replicated to provide the same information for `TargetKind` or any other registry and provide this information to generate arguments in `tvmc` using `argparse`:
+```
+parser.add_argument(f"--target-{kind}-{attr}", ...)
+```
+
+# Drawbacks
+[drawbacks]: #drawbacks
+
+# Rationale and alternatives
+[rationale-and-alternatives]: #rationale-and-alternatives
+
+There's a number of alternative methods for injecting this information which have been used in other CLIs but obfuscate some of the information from the CLI arguments themselves:
+- Continue using target strings
+- Specify JSON
+
+# Prior art
+[prior-art]: #prior-art
+
+This is not dissimilar to how `gcc` or `clang` provide options, [for example in gcc](https://gcc.gnu.org/onlinedocs/gcc/Instrumentation-Options.html):
+```
+gcc -fsanitize=address -fsanitize-address-use-after-scope
+```
+
+# Unresolved questions
+[unresolved-questions]: #unresolved-questions
+
Review comment:
i think there are some unresolved questions in my mind around handling of heterogeneous targets (e.g. with >2 target), and around some efforts i think @junrushao1994 is familiar with around representing and parsing targets from JSON.
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