Update README.md

README.md

@@ -708,6 +708,8 @@ Each instance has scalar attributes (canvas) and sequence attributes (elements).
 
 ### Data Fields
 
+In the following, categorical fields are shown as `string` type, but the actual storage is `int64`.
+
 **Context features (Canvas attributes)**
 
 | Field         | Type   | Shape | Description                                                    |
@@ -716,8 +718,8 @@ Each instance has scalar attributes (canvas) and sequence attributes (elements).
 | group         | string | ()    | Broad design group, such as social media posts or blog headers |
 | format        | string | ()    | Detailed design format, such as Instagram post or postcard     |
 | category      | string | ()    | Topic category of the design, such as holiday celebration      |
-| canvas_width  | int64  | ()    | Canvas pixel width                                             |
-| canvas_height | int64  | ()    | Canvas pixel height                                            |
+| canvas_width  | string | ()    | Canvas pixel width                                             |
+| canvas_height | string | ()    | Canvas pixel height                                            |
 | length        | int64  | ()    | Length of sequence features                                    |
 
 **Sequence features (Element attributes)**
@@ -738,9 +740,7 @@ Each instance has scalar attributes (canvas) and sequence attributes (elements).
 | text_align  | string  | ()    | Horizontal text alignment, left, center, right for text element      |
 | angle       | float32 | ()    | Element rotation angle (radian) w.r.t. the center of the element     |
 
-Note that the color and pre-rendered images are do not necessarily accurately
-reproduce the original design templates.
-The original template is accessible at the following URL if still available.
+Note that the color and pre-rendered images do not necessarily accurately reproduce the original design templates. The original template is accessible at the following URL if still available.
 
 ```
 https://create.vista.com/artboard/?template=<template_id>