add GH action CPU tests

.gitattributes

@@ -0,0 +1,2 @@
+# this drop notebooks from GitHub language stats
+*.ipynb linguist-vendored

.github/workflows/ci-testing.yml

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+name: CI CPU testing
+
+# see: https://help.github.com/en/actions/reference/events-that-trigger-workflows
+on: [push, pull_request]
+
+jobs:
+  cpu-tests:
+
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest]  #, macOS-10.15, windows-2019
+        python-version: [3.7, 3.8]
+        yolo5-model: ["yolov5s", "yolov5m", "yolov5l", "yolov5x"]
+
+    # Timeout: https://stackoverflow.com/a/59076067/4521646
+    timeout-minutes: 50
+    steps:
+    - uses: actions/checkout@v2
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v2
+      with:
+        python-version: ${{ matrix.python-version }}
+
+    # Note: This uses an internal pip API and may not always work
+    # https://github.com/actions/cache/blob/master/examples.md#multiple-oss-in-a-workflow
+    - name: Get pip cache
+      id: pip-cache
+      run: |
+        python -c "from pip._internal.locations import USER_CACHE_DIR; print('::set-output name=dir::' + USER_CACHE_DIR)"
+
+    - name: Cache pip
+      uses: actions/cache@v1
+      with:
+        path: ${{ steps.pip-cache.outputs.dir }}
+        key: ${{ runner.os }}-${{ matrix.python-version }}-pip-${{ hashFiles('requirements.txt') }}
+        restore-keys: |
+          ${{ runner.os }}-${{ matrix.python-version }}-pip-
+
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        pip install -q numpy  # for cocoapi proper install
+        pip install -qr requirements.txt -f https://download.pytorch.org/whl/cpu/torch_stable.html
+        pip install -q onnx
+        python --version
+        pip --version
+        pip list
+      shell: bash
+
+    - name: Download data
+      run: |
+        python -c "from utils.google_utils import * ; gdrive_download('1n_oKgR81BJtqk75b00eAjdv03qVCQn2f', 'coco128.zip')"
+        mv ./coco128 ../
+
+    - name: Download weights
+      run: |
+        bash weights/download_weights.sh
+
+    - name: Tests workflow
+      run: |
+        # to run *.py. files in subdirectories
+        export PYTHONPATH="$PWD"
+        # define device
+        di=cpu # inference devices
+        # train
+        python train.py --weights weights/${{ matrix.yolo5-model }}.pt --cfg models/${{ matrix.yolo5-model }}.yaml --epochs 1 --img 320 --device $di --batch-size 2
+        # detect official
+        python detect.py --weights weights/${{ matrix.yolo5-model }}.pt --device $di
+        # detect custom
+        python detect.py --weights runs/exp0/weights/last.pt --device $di
+        # test official
+        python test.py --weights weights/${{ matrix.yolo5-model }}.pt --device $di --batch-size 1
+        # test custom
+        python test.py --weights runs/exp0/weights/last.pt --device $di  --batch-size 1
+        # inspect
+        python models/yolo.py --cfg models/${{ matrix.yolo5-model }}.yaml
+        # export
+        python models/export.py --weights weights/${{ matrix.yolo5-model }}.pt --img 640 --batch 1
+      shell: bash

README.md

@@ -2,6 +2,8 @@
 <img src="https://user-images.githubusercontent.com/26833433/82944393-f7644d80-9f4f-11ea-8b87-1a5b04f555f1.jpg" width="1000"></a>
 &nbsp
 
+![CI CPU testing](https://github.com/ultralytics/yolov5/workflows/CI%20CPU%20testing/badge.svg)
+
 This repository represents Ultralytics open-source research into future object detection methods, and incorporates our lessons learned and best practices evolved over training thousands of models on custom client datasets with our previous YOLO repository https://github.com/ultralytics/yolov3. **All code and models are under active development, and are subject to modification or deletion without notice.** Use at your own risk.
 
 <img src="https://user-images.githubusercontent.com/26833433/85340570-30360a80-b49b-11ea-87cf-bdf33d53ae15.png" width="1000">** GPU Speed measures end-to-end time per image averaged over 5000 COCO val2017 images using a V100 GPU with batch size 8, and includes image preprocessing, PyTorch FP16 inference, postprocessing and NMS.

weights/download_weights.sh

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 #!/bin/bash
 # Download common models
 
-python3 -c "from utils.google_utils import *;
+python -c "
+from utils.google_utils import *;
 attempt_download('weights/yolov5s.pt');
 attempt_download('weights/yolov5m.pt');
 attempt_download('weights/yolov5l.pt');
-attempt_download('weights/yolov5x.pt')"
+attempt_download('weights/yolov5x.pt')
+"