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Log and Results Analysis

Log Analysis

Introduction of log analysis tool

tools/analysis_tools/analyze_logs.py plots curves of given keys according to the log files.

python tools/analysis_tools/analyze_logs.py plot_curve  \
    ${JSON_LOGS}  \
    [--keys ${KEYS}]  \
    [--title ${TITLE}]  \
    [--legend ${LEGEND}]  \
    [--backend ${BACKEND}]  \
    [--style ${STYLE}]  \
    [--out ${OUT_FILE}]  \
    [--window-size ${WINDOW_SIZE}]

Description of all arguments

  • json_logs : The paths of the log files, separate multiple files by spaces.

  • --keys : The fields of the logs to analyze, separate multiple keys by spaces. Defaults to ‘loss’.

  • --title : The title of the figure. Defaults to use the filename.

  • --legend : The names of legend, the number of which must be equal to len(${JSON_LOGS}) * len(${KEYS}). Defaults to use "${JSON_LOG}-${KEYS}".

  • --backend : The backend of matplotlib. Defaults to auto selected by matplotlib.

  • --style : The style of the figure. Default to whitegrid.

  • --out : The path of the output picture. If not set, the figure won’t be saved.

  • --window-size: The shape of the display window. The format should be 'W*H'. Defaults to '12*7'.

Note

The --style option depends on seaborn package, please install it before setting it.

How to plot the loss/accuracy curve

We present some examples here to show how to plot the loss curve of accuracy curve by using the tools/analysis_tools/analyze_logs.py

Plot the loss curve in training.

python tools/analysis_tools/analyze_logs.py plot_curve your_log_json --keys loss --legend loss

Plot the top-1 accuracy and top-5 accuracy curves, and save the figure to results.jpg.

python tools/analysis_tools/analyze_logs.py plot_curve your_log_json --keys accuracy/top1 accuracy/top5  --legend top1 top5 --out results.jpg

Compare the top-1 accuracy of two log files in the same figure.

python tools/analysis_tools/analyze_logs.py plot_curve log1.json log2.json --keys accuracy_top-1 --legend exp1 exp2

How to calculate training time

tools/analysis_tools/analyze_logs.py can also calculate the training time according to the log files.

python tools/analysis_tools/analyze_logs.py cal_train_time \
    ${JSON_LOGS}
    [--include-outliers]

Description of all arguments:

  • json_logs : The paths of the log files, separate multiple files by spaces.

  • --include-outliers : If set, include the first time record in each epoch (Sometimes the time of the first iteration is longer).

Example:

python tools/analysis_tools/analyze_logs.py cal_train_time work_dirs/your_exp/20230206_181002/vis_data/scalars.json

The output is expected to be like the below.

-----Analyze train time of work_dirs/your_exp/20230206_181002/vis_data/scalars.json-----
slowest epoch 68, average time is 0.3818
fastest epoch 1, average time is 0.3694
time std over epochs is 0.0020
average iter time: 0.3777 s/iter

Result Analysis

With the --out argument in tools/test.py, we can save the inference results of all samples as a file. And with this result file, we can do further analysis.

How to conduct offline metric evaluation

We provide tools/analysis_tools/eval_metric.py to enable the user evaluate the model from the prediction files.

python tools/analysis_tools/eval_metric.py \
      ${RESULT} \
      [--metric ${METRIC_OPTIONS} ...] \

Description of all arguments:

  • result: The output result file in pickle format from tools/test.py.

  • --metric: The metric and options to evaluate the results. You need to specify at least one metric and you can also specify multiple --metric to use multiple metrics.

Please refer the Metric Documentation to find the available metrics and options.

Note

In tools/test.py, we support using --out-item option to select which kind of results will be saved. Please ensure the --out-item is not specified or --out-item=pred to use this tool.

Examples:

# Get the prediction results
python tools/test.py configs/resnet/resnet18_8xb16_cifar10.py \
    https://download.openmmlab.com/mmclassification/v0/resnet/resnet18_b16x8_cifar10_20210528-bd6371c8.pth \
    --out results.pkl

# Eval the top-1 and top-5 accuracy
python tools/analysis_tools/eval_metric.py results.pkl --metric type=Accuracy topk=1,5

# Eval accuracy, precision, recall and f1-score
python tools/analysis_tools/eval_metric.py results.pkl --metric type=Accuracy \
    --metric type=SingleLabelMetric items=precision,recall,f1-score

How to visualize the prediction results

We can use tools/analysis_tools/analyze_results.py to save the images with the highest scores in successful or failed prediction.

python tools/analysis_tools/analyze_results.py \
      ${CONFIG} \
      ${RESULT} \
      [--out-dir ${OUT_DIR}] \
      [--topk ${TOPK}] \
      [--rescale-factor ${RESCALE_FACTOR}] \
      [--cfg-options ${CFG_OPTIONS}]

Description of all arguments:

  • config : The path of the model config file.

  • result: Output result file in json/pickle format from tools/test.py.

  • --out_dir: Directory to store output files.

  • --topk: The number of images in successful or failed prediction with the highest topk scores to save. If not specified, it will be set to 20.

  • --rescale-factor: Image rescale factor, which is useful if the output is too large or too small (Too small images may cause the prediction tag is too vague).

  • --cfg-options: If specified, the key-value pair config will be merged into the config file, for more details please refer to Learn about Configs

Note

In tools/test.py, we support using --out-item option to select which kind of results will be saved. Please ensure the --out-item is not specified or --out-item=pred to use this tool.

Examples:

# Get the prediction results
python tools/test.py configs/resnet/resnet18_8xb16_cifar10.py \
    https://download.openmmlab.com/mmclassification/v0/resnet/resnet18_b16x8_cifar10_20210528-bd6371c8.pth \
    --out results.pkl

# Save the top-10 successful and failed predictions. And enlarge the sample images by 10 times.
python tools/analysis_tools/analyze_results.py \
       configs/resnet/resnet18_8xb16_cifar10.py \
       results.pkl \
       --out-dir output \
       --topk 10 \
       --rescale-factor 10
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