[BYOC][ETHOSN] Introduce the Ethos-N BYOC integration #6222

mbaret · 2020-08-06T10:34:44Z

This is the first of 3 PRs to introduce the Ethos-N integration into TVM via the BYOC framework. It adds support for partitioning and compiling for the Ethos-N77 target with CPU fallback for unsupported operators. Additionally, runtime support is added in the form of an Ethos-N runtime module. In this initial PR, only quantized concatenate and split are supported with follow-up PRs adding support for many further operators.

Co-authored-by: Leo Blonk Leo.Blonk@arm.com @Leo-arm
Co-authored-by: Tristan O'Connor tristan.oconnor@arm.com @tristan-arm
Co-authored-by: Leandro Nunes leandro.nunes@arm.com @leandron
Co-authored-by: Ramana Radhakrishnan ramana.radhakrishnan@arm.com @u99127
Co-authored-by: Luke Hutton luke.hutton@arm.com @lhutton1

mbaret · 2020-08-06T10:41:51Z

cc @zhiics @comaniac @masahi

Note that we're still awaiting the CI docker image to be updated and until then don't expect CI to pass.

comaniac

Only reviewed the cmake and annotation parts due to bandwidth. Will spend time on the codegen and hopefully the runtime tomorrow.

cmake/config.cmake

python/tvm/relay/op/contrib/ethosn.py

src/relay/backend/contrib/ethosn/capabilities.h

comaniac

Thanks for the work!
One high-level suggestion to this PR is to let reviewers know if somewhere is going to be improved in follow-up PRs by TODOs; otherwise some places look overfilled.

src/relay/backend/contrib/ethosn/capabilities.h

src/relay/backend/contrib/ethosn/codegen_ethosn.h

comaniac · 2020-08-07T20:36:59Z

src/relay/backend/contrib/ethosn/codegen.cc

+  return sl::TensorInfo();
+}
+
+void InferTensorsVisitor::InferCall(const CallNode* cn) {


Can we inline this function to InferTensorsVisitor::VisitExpr_(const CallNode* cn)? I didn't see any other reference to this function.

The motivation behind this is principally clarity rather than necessity. The InferCall function ends up getting very long as more operators are introduced and we wanted to separate this lengthy function from the traversal logic so that it is quick to reason about the traversal without having to scan through a huge block of code. If you don't think this clarity if worthwhile, then we can inline it.

Make sense to me in the case of more ops will be added to this function in the future, although the flow Call -> HandleCall looks a bit weird. Let's keep the current implementation for both functions for now and see if there is a better way after most ops are added.

comaniac · 2020-08-07T20:56:34Z

src/relay/backend/contrib/ethosn/codegen.cc

+  return ops;
+}
+
+sl::TensorsAndId ConstructNetworkVisitor::HandleCall(const CallNode* cn) {


Ditto. Can we inline this function?

Same comment as above.

tests/python/contrib/test_ethosn/infrastructure.py

tests/scripts/task_config_build_cpu.sh

src/relay/backend/contrib/ethosn/codegen_ethosn.h

mbaret · 2020-08-10T14:33:31Z

In addition to the suggested changes, I've added some further comments/documentation and moved implementations out of header files.

comaniac

Most of my comments have been addressed. Thanks for the efforts :)
Also cc @zhiics @masahi for their reviews.

zhiics

Thanks for the contribution. Some high-level comments:

It looks that this is a different from C source module and the json runtime module. Could you elaborate a bit why those two don't fit?
It seems that we are not really able to test them on HW in the CI. Is there any plan on this?
Why do we start from concat instead of conv2d?

cmake/modules/contrib/EthosN.cmake

cmake/util/FindEthosN.cmake

zhiics · 2020-08-11T16:15:12Z

python/tvm/relay/op/contrib/ethosn.py

+
+
+@tvm.ir.register_op_attr("split", "target.ethos-n")
+def split(attrs, args):


Can you elaborate a bit why we currently chose these two ops other than more common ones like conv2d, etc?

Conv2D is coming in the next PR. We split it up like this so that we could focus initially on the mechanics of the integration itself. Split/Concat motivate the tuple handling in the codegen which is why they were introduced now. Conv2D has a lot of other complexity to do with conversion between TVM and Support Library and so we thought that would be best handled separately.

zhiics · 2020-08-11T16:16:30Z

src/relay/backend/contrib/ethosn/capabilities.h

+namespace contrib {
+namespace ethosn {
+
+/* Ethos-N variants (N77, N57 and N37)


just curious, what would need to change later for the support of N78? Is this backward compatible?

It's the same architecture/software stack, so we anticipate it is just an extension of what is already here.

src/runtime/contrib/ethosn/ethosn_device.cc

src/runtime/contrib/ethosn/ethosn_runtime.h

tests/python/contrib/test_ethosn/infrastructure.py

src/runtime/contrib/ethosn/ethosn_runtime.h

src/relay/backend/contrib/ethosn/ethosn_api.cc

tests/python/contrib/test_ethosn/infrastructure.py

mbaret · 2020-08-11T17:54:35Z

It looks that this is a different from C source module and the json runtime module. Could you elaborate a bit why those two don't fit?

The Ethos-N compiler compiles the graph down to a so-called 'command stream' which is a binary artifact that is directly consumed by the driver to execute the inference. It has encoded within it all the constants/weights. We're not calling out to a C library so the C source module wouldn't make sense here. Additionally, the JSON runtime wouldn't really add any useful functionality. We just want to load the artifact off the disk and wrap it in a packed function.

It seems that we are not really able to test them on HW in the CI. Is there any plan on this?

We don't expect there to be HW in CI. CI will run SW testing including a mocked inference function so that we can test the compilation flow all the way through to the runtime. We will be running automated HW testing on a range of networks within Arm.

To be explicit about the next 2 PRs, they are already written and only add more operators. Specifically, the next PR will add quantized conv2d and the final one will add quite a few more less complex operators. We wanted to split these up to make it easier to see how the codegen operates without the added complexity of all the other operators. The final PR will also include network tests for mobilenet, inceptionv3/4 and ssd mobilenet.

This is the first of 3 PRs to introduce the Ethos-N integration into TVM via the BYOC framework. It adds support for partitioning and compiling for the Ethos-N77 target with CPU fallback for unsupported operators. Additionally, runtime support is added in the form of an Ethos-N runtime module. In this initial PR, only quantized concatenate and split are supported with follow-up PRs adding support for many further operators. Co-authored-by: Leo Blonk <Leo.Blonk@arm.com> Co-authored-by: Tristan O'Connor <tristan.oconnor@arm.com> Co-authored-by: Leandro Nunes <leandro.nunes@arm.com> Co-authored-by: Ramana Radhakrishnan <ramana.radhakrishnan@arm.com> Co-authored-by: Luke Hutton <luke.hutton@arm.com>

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mbaret · 2020-08-17T09:52:36Z

Now the docker image is updated this passes CI, could you take another look @zhiics @masahi ?

masahi · 2020-08-17T10:54:19Z

src/runtime/contrib/ethosn/ethosn_runtime.cc

+                                     const ObjectPtr<Object>& sptr_to_self) {
+  if (network_map_.find(name) != network_map_.end()) {
+    return PackedFunc([sptr_to_self, this, name](TVMArgs args, TVMRetValue* rv) {
+      *rv = Inference(args, network_map_[name].cmm.get(), network_map_[name].inputs,


A very minor issue, but isn't it looking up network_map_ on every inference call?

It is, to get the correct function from the module according to the name.

zhiics · 2020-08-17T16:15:16Z

src/relay/backend/contrib/ethosn/codegen_ethosn.h

+/*!
+ * \brief A base class for error handling using ErrorReporter.
+ */
+class ErrorReportingPass {


I think you probably don't have to have this error reporter. Jared has built a more powerful diagnostic error reporter in #6162. And we will need to migrate all error reporting in Relay to it. cc @jroesch

This error reporter is primarily to assist us in debugging. Do you know of any existing passes that have been migrated?

ahh, you can probably keep this for now and work on it later when #6274 is merged.

zhiics · 2020-08-17T16:22:56Z

Mostly LGTM. @Leo-arm, @tristan-arm, @leandron, @u99127, @lhutton1, can any of you take a look as well since you are more familiar with the ARM side?

leandron · 2020-08-17T16:46:20Z

Mostly LGTM. @Leo-arm, @tristan-arm, @leandron, @u99127, @lhutton1, can any of you take a look as well since you are more familiar with the ARM side?

Thanks @zhiics - we conducted an internal code review before submitting this PR, so it is fair to assume most people mentioned here already approved this patch.

Leo-arm · 2020-08-17T16:46:31Z

We have done internal reviews for our initial integration, this patch and the next few, and this LGTM.

mbaret · 2020-08-19T16:14:44Z

ping @zhiics

zhiics · 2020-08-19T16:20:18Z

@masahi had a comment above, can you respond?

zhiics · 2020-08-19T16:40:05Z

Thanks @mbaret @masahi @comaniac @leandron @Leo-arm

mbaret · 2020-08-19T16:44:53Z

Thanks everyone :)

* [BYOC][ETHOSN] Introduce the Ethos-N BYOC integration This is the first of 3 PRs to introduce the Ethos-N integration into TVM via the BYOC framework. It adds support for partitioning and compiling for the Ethos-N77 target with CPU fallback for unsupported operators. Additionally, runtime support is added in the form of an Ethos-N runtime module. In this initial PR, only quantized concatenate and split are supported with follow-up PRs adding support for many further operators. Co-authored-by: Leo Blonk <Leo.Blonk@arm.com> Co-authored-by: Tristan O'Connor <tristan.oconnor@arm.com> Co-authored-by: Leandro Nunes <leandro.nunes@arm.com> Co-authored-by: Ramana Radhakrishnan <ramana.radhakrishnan@arm.com> Co-authored-by: Luke Hutton <luke.hutton@arm.com> * Turn off USE_ETHOSN_HW by default Change-Id: Ie2ce4528e16e93aa83df46f8a229c0ce89b45252 * Update capabilities file Change-Id: Iebd0c62d6bc7e446662abdee4882ac874ad98aa3 * Fix missing header Change-Id: I0c89e380dd1d795755a1884c06a7b317a99fe297 * Update cmake comments on ETHOSN_HW Change-Id: I2e96a1c818a82e5174fd94e483b0bdb3e4375a7d * Add checker for case when USE_ETHOSN=OFF and USE_ETHOSN_HW=ON Change-Id: Id5c9cfb866914a0298b44ead40fcbe3764ce443c * Fix 'available' boolean Change-Id: I78e54fb9f472d2815886bea4d94b7247e0d129de * Check availability in op registration Change-Id: Iecfea7dca7301dd684199c9b32f99f2113fdfd56 * Remove unnecessary line Change-Id: Idf5cab853027adb0b0292de877e6dc02683821d7 * Simplify getting output_size Change-Id: If4643924768c2d7ea98525e9f792b7223cc2bcdf * Remove unnecessary new line Change-Id: Ia689c59cac28bd91e237ceecd829d8cf56d0d9c1 * Remove NOLINTS Change-Id: I149b97b28b516c7d9288a0858b2fbf1497e70250 * Remove unused parts of PR Change-Id: I2db5b89d8fe2c114ab92305cdcf06d0fc45f4d2a * Fix CI Ethos-N settings Change-Id: Idd955755d6f6d1cd3843462f627d0d952729e467 * Removed unnecessary line in infra Change-Id: I0ea866adf5d9166db85dd82d013a631d991ae633 * Remove unnecessary len in infra Change-Id: I869e8233d41c6ab7c2dc80f47d976c974043b80c * Rename 'cpu_ops' to 'host_ops' Change-Id: I79a6ffcfd48cd055d279f493c672ec82f0c68e5c * Added explanation on mocking Change-Id: I1e88c07a47464e44cb45c6a327ec9c7e2d70cc94 * IsEthosOp -> IsEthosnOp Change-Id: I4fc1b462a74f8fae231ebafac614dd8d45be0feb * Improve documentation in ethosn_api.h Change-Id: I5586a7ba7ce71da667a6a9c6dd2e591028eb43b2 * No longer iterate over module when compiling Change-Id: I80e1d494c6d574be06a2375e831343485712914d * Move EthosnCompiler implementations into codegen.cc Change-Id: I5bb6e9f62722d930d9dc040ac62bf87f29dd74c5 * Fix linting Change-Id: Ia44ec741a5330ad289cc6b5cd2bb1ed784fe6afc * Refactor EthosnAPI compilation functions into EthosnCompiler Change-Id: Iee0aecbe43a84fefb437ab9ff064e3f8b42c80a4 * Improve docs for Tvm2Npu Change-Id: Ia39e9e1508513ca39c1d585fbccc3ae38fcbb9fb * Move more implementation out of headers Change-Id: I1e33084ceb520b75f06b4d7a4acff5b9b2225bd5 * Move implementation in ethosn_api.h Change-Id: I51ab386892a2aa84aa47d03641aac8468f5737ae * Improve docs for capabilities.h Change-Id: Iaaee508aafa1cbb7650a04ed87bd6c1b91823a58 * Use else() in cmake Change-Id: I4b64a87f32b3616ec87c9937d9fc998b8dc5d7b4 * Use GetDataSize Change-Id: I16988f3adbe6e03fc47fa0a77cb5febb7a02eaab * Use const& Change-Id: I664982d219f9a7d1f961dbfe84d12f66e2e5f5cb * Fix python linting Change-Id: Id965ccc037fd40cbdfcb58d922cc8d5fb8c87dfe * Remove load/save to file Change-Id: I7f8c3f5c8948c3f15551d28e3fee6e00120663ef * data->data Change-Id: Ifb861ebbfeaaf4b154f4b1515f83a46aecf86e50 * Remove specific cpu target Change-Id: I920568cc7a81cd77d44f8604f571340a330f3e62 * Test export/load module Change-Id: Ib605458127485e2015ac012ec515ced5900705f3 * Fix cmake garbage Change-Id: I32f3c967192c7c278ef33c52cac5fb5da682cd1b Co-authored-by: Leo Blonk <Leo.Blonk@arm.com> Co-authored-by: Tristan O'Connor <tristan.oconnor@arm.com> Co-authored-by: Leandro Nunes <leandro.nunes@arm.com> Co-authored-by: Ramana Radhakrishnan <ramana.radhakrishnan@arm.com> Co-authored-by: Luke Hutton <luke.hutton@arm.com>

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mbaret force-pushed the ethosn-initial branch from 2936ee5 to 5e5ad93 Compare August 10, 2020 14:51

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zhiics reviewed Aug 11, 2020

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mbaret and others added 21 commits August 13, 2020 09:50

Turn off USE_ETHOSN_HW by default

a73e524

Change-Id: Ie2ce4528e16e93aa83df46f8a229c0ce89b45252

Update capabilities file

e116823

Change-Id: Iebd0c62d6bc7e446662abdee4882ac874ad98aa3

Fix missing header

5350901

Change-Id: I0c89e380dd1d795755a1884c06a7b317a99fe297

Update cmake comments on ETHOSN_HW

b69b7a8

Change-Id: I2e96a1c818a82e5174fd94e483b0bdb3e4375a7d

Add checker for case when USE_ETHOSN=OFF and USE_ETHOSN_HW=ON

1d03ac9

Change-Id: Id5c9cfb866914a0298b44ead40fcbe3764ce443c

Fix 'available' boolean

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Change-Id: I78e54fb9f472d2815886bea4d94b7247e0d129de

Check availability in op registration

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Change-Id: Iecfea7dca7301dd684199c9b32f99f2113fdfd56

Remove unnecessary line

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Change-Id: Idf5cab853027adb0b0292de877e6dc02683821d7

Simplify getting output_size

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Change-Id: If4643924768c2d7ea98525e9f792b7223cc2bcdf

Remove unnecessary new line

587e4a5

Change-Id: Ia689c59cac28bd91e237ceecd829d8cf56d0d9c1

Remove NOLINTS

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Change-Id: I149b97b28b516c7d9288a0858b2fbf1497e70250

Remove unused parts of PR

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Change-Id: I2db5b89d8fe2c114ab92305cdcf06d0fc45f4d2a

Fix CI Ethos-N settings

3eacad8

Change-Id: Idd955755d6f6d1cd3843462f627d0d952729e467

Removed unnecessary line in infra

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Change-Id: I0ea866adf5d9166db85dd82d013a631d991ae633

Remove unnecessary len in infra

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Change-Id: I869e8233d41c6ab7c2dc80f47d976c974043b80c

Rename 'cpu_ops' to 'host_ops'

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Change-Id: I79a6ffcfd48cd055d279f493c672ec82f0c68e5c

Added explanation on mocking

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Change-Id: I1e88c07a47464e44cb45c6a327ec9c7e2d70cc94

IsEthosOp -> IsEthosnOp

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Change-Id: I4fc1b462a74f8fae231ebafac614dd8d45be0feb

Improve documentation in ethosn_api.h

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Change-Id: I5586a7ba7ce71da667a6a9c6dd2e591028eb43b2

No longer iterate over module when compiling

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Change-Id: I80e1d494c6d574be06a2375e831343485712914d

mbaret added 8 commits August 13, 2020 09:50

Use else() in cmake

93c5091

Change-Id: I4b64a87f32b3616ec87c9937d9fc998b8dc5d7b4

Use GetDataSize

5e62110

Change-Id: I16988f3adbe6e03fc47fa0a77cb5febb7a02eaab

Use const&

d9b5e22

Change-Id: I664982d219f9a7d1f961dbfe84d12f66e2e5f5cb

Fix python linting

d06da5a

Change-Id: Id965ccc037fd40cbdfcb58d922cc8d5fb8c87dfe

Remove load/save to file

c6a0c1b

Change-Id: I7f8c3f5c8948c3f15551d28e3fee6e00120663ef

data->data

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Change-Id: Ifb861ebbfeaaf4b154f4b1515f83a46aecf86e50

Remove specific cpu target

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Change-Id: I920568cc7a81cd77d44f8604f571340a330f3e62

Test export/load module

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Change-Id: Ib605458127485e2015ac012ec515ced5900705f3

mbaret force-pushed the ethosn-initial branch from afd5727 to 57d1569 Compare August 13, 2020 09:03

Fix cmake garbage

3ab99dd

Change-Id: I32f3c967192c7c278ef33c52cac5fb5da682cd1b

mbaret force-pushed the ethosn-initial branch from aee6cfb to 3ab99dd Compare August 15, 2020 23:02

masahi reviewed Aug 17, 2020

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masahi approved these changes Aug 17, 2020

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zhiics reviewed Aug 17, 2020

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zhiics approved these changes Aug 19, 2020

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zhiics merged commit 3cff742 into apache:master Aug 19, 2020

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[BYOC][ETHOSN] Introduce the Ethos-N BYOC integration #6222

[BYOC][ETHOSN] Introduce the Ethos-N BYOC integration #6222

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		@tvm.ir.register_op_attr("split", "target.ethos-n")
		def split(attrs, args):

[BYOC][ETHOSN] Introduce the Ethos-N BYOC integration #6222

[BYOC][ETHOSN] Introduce the Ethos-N BYOC integration #6222

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