Update Readme and dataset

README.md

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 license: cc-by-4.0
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+# Introduction to Anywhere3D-bench
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+eval_anywhere3D_aligned_total.json contains the all 2632 referring expressions-3D bounding box pairs from Anywhere3D benchmark.
+
+The meaning of each key in the dictionary is as follows.The red color denotes the key-value pairs that directly related to expressions-3D bounding box pairs while the rest are helpful for annotation interface.
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+<span style="color:red">"grounding_level": grounding level of the expression, selected from one of the four values: ["area_level", "space_level", "object_level", "part_level"]. </span>
+<span style="color:red">"expression_type": specifies the type of expression at each grounding level. </span>
+"db_id": specifies the database ID in MongoDB during Human Annotation and Verification
+"expressions_cnt_in_annotation_interface": specifies the expression number during Human Annotation and Verification
+<span style="color:red">"datasetname": selected from one of the four values: ["scannet", "multiscan", "3RScan", "arkitscene_valid"].</span>
+<span style="color:red">"scene_id": From simplicity during Human Annotation and Verification, we rename the scene_id in the original dataset</span>
+<span style="color:red">"scene_name": The original scene_id of the four datasets</span>
+<span style="color:red">"referring_expressions": referring expressions in Anywhere3D</span>
+<span style="color:red">"box_width": The length of the ground-truth 3D bounding box along X-axis. </span>
+<span style="color:red">"box_length" The length of the ground-truth 3D bounding box along Y-axis. </span>
+<span style="color:red">"box_height" The length of the ground-truth 3D bounding box along Z-axis. </span>
+<span style="color:red">"box_x": The center coordinate of the ground-truth 3D bounding box along X-axis. </span>
+<span style="color:red">"box_y": The center coordinate of the ground-truth 3D bounding box along Y-axis. </span>
+<span style="color:red">"box_z": The center coordinate of the ground-truth 3D bounding box along Z-axis. </span>
+<span style="color:red">"box_rot_angle": The rotation angle of ground-truth 3D bounding box. </span>
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+"cylinder_diameter": The diameter of the distance measurement tool
+"cylinder_length": The length of the distance measurement tool
+"cylinder_x": The center coordinate of the distance measurement tool along X-axis
+"cylinder_y": The center coordinate of the distance measurement tool along Y-axis
+"cylinder_z": The center coordinate of the distance measurement tool along Z-axis
+"cylinder_rot_angle": The rotation angle of distance measurement tool
+"window_camera_position_x", "window_camera_position_y", "window_camera_position_z", "window_camera_quaternion_x", "window_camera_quaternion_y", "window_camera_quaternion_z", "window_camera_quaternion_w": The camera position and quaternion in annotation interface.
+"window_camera_target_x", "window_camera_target_y", "window_camera_target_z": The camera target in annotation interface.