![\"\"](\"https://www.googleapis.com/download/storage/v1/b/kaggle-forum-message-attachments/o/inbox%2F4001300%2F122c4b000ff4bab91a527bcc5f2bc2c0%2FClipboard_05-31-2025_01.jpg?generation=1748666746905920&alt=media\")
The dataset description page states the following:
\n there sensor response (e.g., there nearby causing a signal reflection), a present this field. Units are uncalibrated sensor the \nHowever, I have confirmed that the 'tof' sensor values contain not only -1 but also 'null' values.
\n
(in this case, tof_5 has only null value)
\nBased on the following text, should I interpret this as a communication failure?
\nNote that there known sensor communication failure this dataset, resulting missing data sensors .\nBut is \"no sensor response\" the same as the sensor communication failure ?? confused…
", "messages": [ { "id": 3214185, "postDate": "2025-05-31T04:48:32.247Z", "content": "The dataset description page states the following:
\n there sensor response (e.g., there nearby causing a signal reflection), a present this field. Units are uncalibrated sensor the \nHowever, I have confirmed that the 'tof' sensor values contain not only -1 but also 'null' values.
\n
(in this case, tof_5 has only null value)
\nBased on the following text, should I interpret this as a communication failure?
\nNote that there known sensor communication failure this dataset, resulting missing data sensors .\nBut is \"no sensor response\" the same as the sensor communication failure ?? confused…
", "rawMarkdown": "The dataset description page states the following:\n```\nIf there is no sensor response (e.g., if there is no nearby object causing a signal reflection), a -1 is present in this field. Units are uncalibrated sensor values in the range 0-254. \n```\n\nHowever, I have confirmed that the 'tof' sensor values contain not only -1 but also 'null' values.\n\n\n\n(in this case, tof_5 has only null value)\n\nBased on the following text, should I interpret this as a communication failure?\n\n```\nNote also that there is known sensor communication failure in this dataset, resulting in missing data from some sensors in some sequences.\n```\n\nBut is \"no sensor response\" the same as the sensor communication failure ?? confused...", "votes": 12 }, { "id": 3217018, "postDate": "2025-06-04T12:22:47.600Z", "content": "Value Meaning
\n0–254 Valid sensor reading (range/distance)
\n-1 No object detected (sensor is working, but no return signal)
\nnull Communication failure (sensor did not respond at all)
@jinhuaawang Thank you for comment ! Good insight.
", "rawMarkdown": "@jinhuaawang Thank you for comment ! Good insight." } ] }, { "id": 3217321, "postDate": "2025-06-04T21:27:30.617Z", "content": "I think it's related to that.
\nHalf of the hidden-test sequences are recorded with IMU only; the thermopile (thm_) and time-of-flight (tof__v*) columns are still present but contain null values for those sequences.
@eikyou Thanks for your comment. That may be true, but I still feel that having just one test dataset—like the training data—should be sufficient.
", "rawMarkdown": "@eikyou Thanks for your comment. That may be true, but I still feel that having just one test dataset—like the training data—should be sufficient." } ] }, { "id": 3214213, "postDate": "2025-05-31T05:50:54.563Z", "content": "The details of this dataset are unclear, but there are cases where a ToF sensor returns null when no object is within its measurable range. Therefore, such behavior may be possible.
", "rawMarkdown": "The details of this dataset are unclear, but there are cases where a ToF sensor returns null when no object is within its measurable range. Therefore, such behavior may be possible.", "votes": 1, "replies": [ { "id": 3214433, "postDate": "2025-05-31T14:22:27.930Z", "content": "@kakuteki Thanks for commenting! Ah, so that's how it works from a technical standpoint! That's really valuable information – I appreciate it. It helps a lot!
", "rawMarkdown": "@kakuteki Thanks for commenting! Ah, so that's how it works from a technical standpoint! That's really valuable information – I appreciate it. It helps a lot!", "votes": 1 } ] }, { "id": 3214212, "postDate": "2025-05-31T05:50:23.970Z", "rawMarkdown": "", "isDeleted": true } ], "comments": [ { "id": 3217018, "author_name": "", "author_url": "", "post_date": "2025-06-04T12:22:47.600000", "content": "Value Meaning
\n0–254 Valid sensor reading (range/distance)
\n-1 No object detected (sensor is working, but no return signal)
\nnull Communication failure (sensor did not respond at all)
@jinhuaawang Thank you for comment ! Good insight.
", "votes": 0, "replies": [] } ] }, { "id": 3217321, "author_name": "eikyou", "author_url": "", "post_date": "2025-06-04T21:27:30.617000", "content": "I think it's related to that.
\nHalf of the hidden-test sequences are recorded with IMU only; the thermopile (thm_) and time-of-flight (tof__v*) columns are still present but contain null values for those sequences.
@eikyou Thanks for your comment. That may be true, but I still feel that having just one test dataset—like the training data—should be sufficient.
", "votes": 0, "replies": [] } ] }, { "id": 3214213, "author_name": "kakuteki", "author_url": "", "post_date": "2025-05-31T05:50:54.563000", "content": "The details of this dataset are unclear, but there are cases where a ToF sensor returns null when no object is within its measurable range. Therefore, such behavior may be possible.
", "votes": 1, "replies": [ { "id": 3214433, "author_name": "chumajin", "author_url": "", "post_date": "2025-05-31T14:22:27.930000", "content": "@kakuteki Thanks for commenting! Ah, so that's how it works from a technical standpoint! That's really valuable information – I appreciate it. It helps a lot!
", "votes": 1, "replies": [] } ] }, { "id": 3214212, "author_name": "", "author_url": "", "post_date": "2025-05-31T05:50:23.970000", "content": "", "votes": 0, "replies": [] } ], "raw_markdown_by_id": { "3214185": "The dataset description page states the following:\n```\nIf there is no sensor response (e.g., if there is no nearby object causing a signal reflection), a -1 is present in this field. Units are uncalibrated sensor values in the range 0-254. \n```\n\nHowever, I have confirmed that the 'tof' sensor values contain not only -1 but also 'null' values.\n\n\n\n(in this case, tof_5 has only null value)\n\nBased on the following text, should I interpret this as a communication failure?\n\n```\nNote also that there is known sensor communication failure in this dataset, resulting in missing data from some sensors in some sequences.\n```\n\nBut is \"no sensor response\" the same as the sensor communication failure ?? confused...", "3217018": "Value\tMeaning\n0–254\tValid sensor reading (range/distance)\n-1\tNo object detected (sensor is working, but no return signal)\nnull\tCommunication failure (sensor did not respond at all)", "3217321": "I think it's related to that.\n`Half of the hidden-test sequences are recorded with IMU only; the thermopile (thm_) and time-of-flight (tof__v*) columns are still present but contain null values for those sequences.`", "3214213": "The details of this dataset are unclear, but there are cases where a ToF sensor returns null when no object is within its measurable range. Therefore, such behavior may be possible.", "3214212": "" } }