Add COCO writer (#46)

* docs: update tutorial 1.

* docs: update tutorial 2.

* chore: refactor writer to remove dependencies

* feat: add coco writer

* docs: clean docstrings

* fix: annotations format in coco writer

* docs: improve docstrings.

* docs: improve docs.

docs/reference/readers.md

@@ -1,3 +1,9 @@
+# Base reader class
+
 ::: detection_datasets.readers.base.BaseReader
 
+<br>
+
+# COCO reader
+
 ::: detection_datasets.readers.coco.CocoReader

docs/reference/writers.md

@@ -1,5 +1,31 @@
+# Base writer class
+
+This is the base class that other writers inherit from.  
+It enforces the use of the `write()` method in all writers.
+
 ::: detection_datasets.writers.base.BaseWriter
 
+<br>
+
+# Mmdet writer
+
+This writer saves a dataset to disk in the MMdetection format, that is called "middle format" on the MMdetection documentation.  
+For more details check [Tutorial 2: Customize Datasets](https://mmdetection.readthedocs.io/en/latest/tutorials/customize_dataset.html#reorganize-new-data-format-to-middle-format) on the MMdetection documentation.
+
 ::: detection_datasets.writers.mmdet.MmdetWriter
 
+<br>
+
+# YOLO writer
+
+This writer saves a dataset to disk in the YOLO format.  
+
 ::: detection_datasets.writers.yolo.YoloWriter
+
+<br>
+
+# COCO writer
+
+This writer saves a dataset to disk in the COCO format.  
+
+::: detection_datasets.writers.coco.CocoWriter

docs/tutorials/2_Transform.ipynb

@@ -1498,7 +1498,7 @@
         "3 thinks will happen when applying this new mapping:  \n",
         "- The existing categories will be replaced by their mapped category names\n",
         "- The existing categories that have no equivalent in this mapping will be dropped  \n",
-        "- The category_id will be recreated using the alphabetical order of the new categories (here 'Accessiroes' will have id et to 0, Bags to 1 and so on)"
+        "- The category_id will be recreated using the alphabetical order of the new categories (here 'Accessories' will have id 0, 'Bags' 1 and so on)"
       ]
     },
     {

mkdocs.yml

@@ -43,7 +43,12 @@ nav:
       - Writers: reference/writers.md
 
 plugins:
-  - mkdocstrings
+  - mkdocstrings:
+      default_handler: python
+      handlers:
+        python:
+          options:
+            docstring_style: google
   - section-index
   - search
   - mkdocs-jupyter:
@@ -61,3 +66,6 @@ markdown_extensions:
   - pymdownx.superfences
   - toc:
       permalink: "#"
+
+watch:
+  - src