How can I get concrete definitions for the results from `physics.named.data`

Comienza con quadruped.py y la salida de self.named.data.sensordata mostrada en el issue. Sigue las definiciones de los sensores para determinar el eje y el significado físico de cada valor agrupado, incluidos los elementos imu_accel, imu_gyro, force, torque y center_of_mass. Se considera completado cuando se hayan documentado significados concretos para los índices indicados, de modo que los usuarios puedan interpretar cada resultado.

Take the "quadruped" domain as an example. It is known that we can get rough understandings from the quadruped.py that self.named.data.sensordata contains sensor readings as follows:

self.named.data.sensordata
Out[33]: 
FieldIndexer(sensordata):
 0              imu_accel [ 7.2     ]
 1              imu_accel [-2.65    ]
 2              imu_accel [ 22.7    ]
 3               imu_gyro [ 0.448   ]
 4               imu_gyro [ 0.411   ]
 5               imu_gyro [-0.751   ]
 6            velocimeter [-0.206   ]
 7            velocimeter [-0.0947  ]
 8            velocimeter [-0.249   ]
 9   force_toe_front_left [-62.4    ]
10   force_toe_front_left [ 30.4    ]
11   force_toe_front_left [-1.41    ]
12  force_toe_front_right [ 85.1    ]
13  force_toe_front_right [ 20.3    ]
14  force_toe_front_right [-101     ]
15   force_toe_back_right [ 1.19e+03]
16   force_toe_back_right [-291     ]
17   force_toe_back_right [-725     ]
18    force_toe_back_left [ 256     ]
19    force_toe_back_left [-23.1    ]
20    force_toe_back_left [-936     ]
21  torque_toe_front_left [ 0.232   ]
22  torque_toe_front_left [ 0.757   ]
23  torque_toe_front_left [-0.187   ]
24 torque_toe_front_right [-0.256   ]
25 torque_toe_front_right [-1.01    ]
26 torque_toe_front_right [ 0.139   ]
27  torque_toe_back_right [ 2.94    ]
28  torque_toe_back_right [-19.2    ]
29  torque_toe_back_right [ 13      ]
30   torque_toe_back_left [-28.8    ]
31   torque_toe_back_left [ 36.2    ]
32   torque_toe_back_left [-9.05    ]
33         center_of_mass [-0.00071 ]
34         center_of_mass [-0.0362  ]
35         center_of_mass [ 0.82    ]

Although these names provide basic information, I still don't know the concrete meanings for each item. For example, it is hard to infer which imu_accel is for x-axis.