1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
|
# Troubleshooting
- [Troubleshooting](./troubleshooting.md#troubleshooting)
- [Inference results are incorrect for my custom files](./troubleshooting.md#inference-results-are-incorrect-for-my-custom-files)
- [The application does not work with my custom model](./troubleshooting.md#the-application-does-not-work-with-my-custom-model)
- [NPU configuration mismatch error when running inference](./troubleshooting.md#npu-configuration-mismatch-error-when-running-inference)
- [Errors when cloning the repository](./troubleshooting.md#errors-when-cloning-the-repository)
- [Problem installing Vela](./troubleshooting.md#problem-installing-vela)
- [No matching distribution found for ethos-u-vela==3.3.0](./troubleshooting.md#no-matching-distribution-found-for-ethos_u_vela)
- [How to update Python3 package to 3.8 version](./troubleshooting.md#how-to-update-python3-package-to-newer-version)
## Inference results are incorrect for my custom files
Ensure that the files you are using match the requirements of the model you are using. Ensure that cmake parameters are
set accordingly. More information on these cmake parameters is detailed in their separate sections.
> **Note:** Preprocessing of the files can also affect the inference result, such as the rescaling and padding
> operations performed for image classification.
## The application does not work with my custom model
Ensure that your model is in a fully quantized `.tflite` file format, either `uint8` or `int8`, and that it has
successfully been run through the Vela compiler.
Also, please check that the cmake parameters used match the input requirements of your new model.
> **Note:** The Vela tool is not available within this software project. It is a separate Python tool that is available
> from: <https://pypi.org/project/ethos-u-vela/>. The source code is hosted on
> <https://review.mlplatform.org/plugins/gitiles/ml/ethos-u/ethos-u-vela/>.
## NPU configuration mismatch error when running inference
If you see the following error message when an inference is executed:
```commandline
NPU config mismatch: npu.macs_per_cc=8 optimizer.macs_per_cc=7
NPU config mismatch: npu.shram_size=48 optimizer.shram_size=24
ERROR - Invoke failed.
ERROR - Inference failed.
```
It shows that the configuration of the Vela compiled `.tflite` file doesn't match the number of MACs units on the FVP.
The Vela configuration parameter `accelerator-config` used for producing the .`tflite` file that is used
while building the application should match the MACs configuration that the FVP is emulating.
For example, if the `accelerator-config` from the Vela command was `ethos-u55-128`, the FVP should be emulating the
128 MACs configuration of the Ethos™-U55 block(default FVP configuration). If the `accelerator-config` used was
`ethos-u55-256`, the FVP must be executed with additional command line parameter to instruct it to emulate the
256 MACs configuration instead.
The [deploying on an FVP emulating MPS3](./deployment.md#deploying-on-an-fvp-emulating-mps3) page provides guidance
on how to instruct the FVP to change the number of MACs units.
Note that when the FVP is launched and the application starts executing, various parameters about the system are
logged over UART. These include the MACs/cc configuration of the FVP.
```log
INFO - MPS3 core clock has been set to: 32000000Hz
INFO - CPU ID: 0x410fd220
INFO - CPU: Cortex-M55 r0p0
INFO - Ethos-U device initialised
INFO - Ethos-U version info:
INFO - Arch: v1.0.6
INFO - Driver: v0.16.0
INFO - MACs/cc: 128
INFO - Cmd stream: v0
INFO - Target system design: Arm Corstone-300 - AN552
INFO - Arm Corstone-300 - AN552 platform initialised
INFO - ARM ML Embedded Evaluation Kit
```
## Errors when cloning the repository
If you see following errors when cloning the repository:
- ```log
fatal: unable to access 'https://review.mlplatform.org/ml/ethos-u/ml-embedded-evaluation-kit/':
server certificate verification failed. CAfile: /etc/ssl/certs/ca-certificates.crt CRLfile: none
```
We suggest to update to the latest common CA certificates:
```commandline
sudo apt-get update
sudo apt-get install ca-certificates
```
- ```log
fatal: unable to access 'https://review.mlplatform.org/ml/ethos-u/ml-embedded-evaluation-kit/':
error:06FFF089:digital envelope routines:CRYPTO_internal:bad key length
```
We suggest to export the `CURL_SSL_BACKEND` variable as `secure-transport`:
```commandline
export CURL_SSL_BACKEND="secure-transport"
```
## Problem installing Vela
During Vela installation, part of the package is compiled and requires libpython3.
If the system lacks this dependency the following error will occur:
```log
x86_64-linux-gnu-gcc -pthread -Wno-unused-result -Wsign-compare -DNDEBUG -g -fwrapv -O2 -Wall -g
-fstack-protector-strong -Wformat -Werror=format-security -g -fwrapv -O2 -g -fstack-protector-strong
-Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2 -fPIC -DNPY_NO_DEPRECATED_API=NPY_1_9_API_VERSION
-I/venv/include -I/usr/include/python3.8 -I/venv/lib/python3.8/site-packages/numpy/core/include
-c ethosu/mlw_codec/mlw_codecmodule.c -o build/temp.linux-x86_64-3.8/ethosu/mlw_codec/mlw_codecmodule.o
ethosu/mlw_codec/mlw_codecmodule.c:20:10: fatal error: Python.h: No such file or directory
20 | #include <Python.h>
| ^~~~~~~~~~
compilation terminated.
error: command 'x86_64-linux-gnu-gcc' failed with exit status 1
----------------------------------------
ERROR: Command errored out with exit status 1: /venv/bin/python -u -c
'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/tmp/pip-install-4rmoh7va/ethos-u-vela/setup.py'"'"'
; __file__='"'"'/tmp/pip-install-4rmoh7va/ethos-u-vela/setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)
(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))'
install --record /tmp/pip-record-jidxiokn/install-record.txt --single-version-externally-managed
--compile --install-headers
/venv/include/site/python3.8/ethos-u-vela Check the logs for full command output.
```
To solve this issue install libpython3 on the system.
## No matching distribution found for ethos-u-vela
Vela 3.3.0 increases Python requirement to at least version 3.8, if not installed on your system the following error will occur:
```log
python3 -m pip install ethos-u-vela==3.3.0
ERROR: Could not find a version that satisfies the requirement ethos-u-vela==3.3.0 (from versions: 0.1.0, 1.0.0, 1.1.0, 1.2.0, 2.0.0, 2.0.1, 2.1.1, 3.0.0, 3.1.0, 3.2.0)
ERROR: No matching distribution found for ethos-u-vela==3.3.0
```
Ensure that the minimum Python 3.8 requirement is installed and it's the default version.
Check your current installed version of Python by running:
```commandline
python3 --version
```
### How to update Python3 package to newer version
1. Check your current installed version of Python by running:
```commandline
python3 --version
```
For example:
```log
Python 3.6.9
```
2. Install the Python 3.8 packages necessary on the system:
```commandline
sudo apt-get install python3.8 python3.8-venv libpython3.8 libpython3.8-dev
```
3. Update the `python3` alternatives (set as 1 your previous version displayed at step 1):
```commandline
sudo update-alternatives --install /usr/bin/python3 python3 /usr/bin/python3.6 1
sudo update-alternatives --install /usr/bin/python3 python3 /usr/bin/python3.8 2
```
4. At the prompt, update the configuration by selecting Python3.8 as the chosen default alternative:
```commandline
sudo update-alternatives --config python3
```
5. Python3.8 is now set as default you can check it by running:
```commandline
python3 --version
```
```log
Python 3.8.0
```
> **Note:** After updating to from Python3.6 Python3.8 it may happen that the `gnome-terminal` or the relative
> shortcuts doesn't work anymore.
> If when opening it from XTerm with `gnome-terminal` the following error appear:
>
> ```log
> Traceback (most recent call last):
> File "/usr/bin/gnome-terminal", line 9, in <module>
> from gi.repository import GLib, Gio
> File "/usr/lib/python3/dist-packages/gi/__init__.py", line 42, in <module>
> from . import _gi
> ImportError: cannot import name '_gi' from partially initialized module 'gi' (most likely due to a circular import)
> (/usr/lib/python3/dist-packages/gi/> __init__.py)
> ```
>
> Modify the `gnome-terminal` script located in `/usr/bin/` and changing the environment (first line of the script)
> from `#!/usr/bin/python3` to `#!/usr/bin/python3.6`.
Next section of the documentation: [Appendix](appendix.md).
|
