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8a468a9f
编写于
1月 02, 2019
作者:
李
李滨
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Merge branch 'doc' into 'master'
Complement HOW-TO-DEBUG docs See merge request !941
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docs/conf.py
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docs/development/how_to_debug.rst
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docs/conf.py
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8a468a9f
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@@ -25,3 +25,10 @@ html_theme = "sphinx_rtd_theme"
html_theme_path
=
[
sphinx_rtd_theme
.
get_html_theme_path
()]
html_static_path
=
[
'_static'
]
smartquotes
=
False
extensions
=
[
'sphinx.ext.autodoc'
,
'sphinx.ext.viewcode'
,
'sphinx.ext.todo'
,
'sphinx.ext.mathjax'
,
]
docs/development/how_to_debug.rst
浏览文件 @
8a468a9f
How to debug
==============
==============
============
Log debug info
Debug correctness
--------------------------
MACE provides tools to examine correctness of model execution by comparing model's output of MACE with output of training platform (e.g., Tensorflow, Caffe).
Three metrics are used as comparison results:
* **Cosine Similarity**:
.. math::
Cosine\ Similarity = \frac{X \cdot X'}{\|X\| \|X'\|}
This metric will be approximately equal to 1 if output is correct.
* **SQNR** (Signal-to-Quantization-Noise Ratio):
.. math::
SQNR = \frac{P_{signal}}{P_{noise}} = \frac{\|X\|^2}{\|X - X'\|^2}
It is usually used to measure quantization accuracy. The higher SQNR is, the better accuracy will be.
* **Pixel Accuracy**:
.. math::
Pixel\ Accuracy = \frac{\sum^{batch}_{b=1} equal(\mathrm{argmax} X_b, \mathrm{argmax} X'_b)}{batch}
It is usually used to measure classification accuracy. The higher the better.
where :math:`X` is expected output (from training platform) whereas :math:`X'` is actual output (from MACE) .
MACE automatically validate these metrics by running models with synthetic inputs.
If you want to specify input data to use, you can add an option in yaml config under 'subgraphs', e.g.,
.. code:: yaml
models:
mobilenet_v1:
platform: tensorflow
model_file_path: https://cnbj1.fds.api.xiaomi.com/mace/miai-models/mobilenet-v1/mobilenet-v1-1.0.pb
model_sha256_checksum: 71b10f540ece33c49a7b51f5d4095fc9bd78ce46ebf0300487b2ee23d71294e6
subgraphs:
- input_tensors:
- input
input_shapes:
- 1,224,224,3
output_tensors:
- MobilenetV1/Predictions/Reshape_1
output_shapes:
- 1,1001
validation_inputs_data:
- https://cnbj1.fds.api.xiaomi.com/mace/inputs/dog.npy
If model's output is suspected to be incorrect, it might be useful to debug your model layer by layer by specifying an intermediate layer as output,
or use binary search method until suspicious layer is found.
Debug memory usage
--------------------------
The simplest way to debug process memory usage is to use ``top`` command. With ``-H`` option, it can also show thread info.
For android, if you need more memory info, e.g., memory used of all categories, ``adb shell dumpsys meminfo`` will help.
By watching memory usage, you can check if memory usage meets expectations or if any leak happens.
Debug performance
--------------------------
Using MACE, you can benchmark a model by examining each layer's duration as well as total duration. Or you can benchmark a single op.
The detailed information is in :doc:`../user_guide/benchmark`.
Debug model conversion
--------------------------
After model is converted to MACE model, a literal model graph is generated in directory `mace/codegen/models/your_model`.
You can refer to it when debugging model conversion.
Debug engine using log
--------------------------
Mace defines two sorts of logs: one is for users (LOG), the other is for developers (VLOG).
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@@ -23,14 +102,7 @@ By using Mace run tool, vlog level can be easily set by option, e.g.,
If models are run on android, you might need to use ``adb logcat`` to view logs.
Debug memory usage
--------------------------
The simplest way to debug process memory usage is to use ``top`` command. With ``-H`` option, it can also show thread info.
For android, if you need more memory info, e.g., memory used of all categories, ``adb shell dumpsys meminfo`` will help.
By watching memory usage, you can check if memory usage meets expectations or if any leak happens.
Debug using GDB
Debug engine using GDB
--------------------------
GDB can be used as the last resort, as it is powerful that it can trace stacks of your process. If you run models on android,
things may be a little bit complicated.
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