HW2.5 capabilities

[AnxietyRanger]

I suspect @verygreen was talking about something interpreted, like shell, perl, or python, etc.

Hence my question. @verygreen what programming language was used in the file this comment came from?

 

[S4WRXTTCS]

Yes, you'll see lots of readable characters. However, those readable characters are not comments. They are strings used by the binary to log messages, open files, request URLS, etc, etc. You'll also see strings used reference symbols in other modules, and to export symbols from the library you're looking at. If you are super lucky, you'll also have debug symbols (like function names for non-exported functions, variables etc). I've never seen source code (eg, comments) included in a binary.

I suspect @verygreen was talking about something interpreted, like shell, perl, or python, etc.

I imagine it's Python.

People in deep learning are obsessed with Python. Now that doesn't mean Tesla can't change it. As far as I can tell python doesn't have to be a strictly interpreted language.

What I find interesting is Tesla left a lot of this stuff readable. Where there doesn't seem to be any attempt at obscuring it. Even when there was already a history of individuals who have gotten root access.

So I have a feeling it was done on purpose. Where the Engineers at Tesla knew this kind of conversation would happen. I imagine one of them is having fun reading these comments. Especially when jimmy_d called them interns.

 

[verygreen]

How do you see the comments @verygreen... which programming language is used to implement them given that there are visible comments in the shipping product?

Like I said, it's in the sql schema, a text file depicting database layout.

They also use a bunch of perl and shell scripts with quite interesting comments in places.
Here's a juicy one:

    # For HW2 we want the board level temp to be above sub-zero, so
    # we're really monitoring board temp here, not Pascal temp.
    read_subzero_sensor=read_mxmtemp
    SUBZERO_SENSOR_TARGET=7
    SUBZERO_SENSOR_NAME="MXM"

    # On HW25, we monitor the Pascal temp.
    if [ -n "$(boardid | grep -F Hw:2.5)" ] ; then
        read_subzero_sensor=read_pascal_temp
        SUBZERO_SENSOR_NAME="Pascal"
    fi

    # Higher minimum because of differences in cooling.
    if [ -n "$(boardid | grep model_3)" ] ; then
        SUBZERO_SENSOR_TARGET=13
    fi

What does this tell us? It tells us that hw2.5 in S/X cars is different in cooling too (Well, we sort of already knew that from
other evidence).

I suspect @verygreen was talking about something interpreted, like shell, perl, or python, etc.

Bingo!

 

[lunitiks]

What is the numerical value that follows subzero_sensor_target? Celsius? Fahrenheit?

 

[lunitiks]

It tells us that hw2.5 in S/X cars is different in cooling too (Well, we sort of already knew that from other evidence)

U mean m3 has different cooling than S/X 2.5, right? Not that HW2.5 has different cooling in S vs X?

 

[MP3Mike]

U mean m3 has different cooling than S/X 2.5, right? Not that HW2.5 has different cooling in S vs X?

I think he means the HW2, HW2.5, and M3 all have different cooling designs.

 

[verygreen]

U mean m3 has different cooling than S/X 2.5, right? Not that HW2.5 has different cooling in S vs X?

Yes. M3 HW2.5 has different cooling than Model S/X HW2.5.

Re the temp - it's Celsius I think.

 

[verygreen]

BTW there's a guy on reddit that claims inside info from AP team with some data.
Take it with a grain of salt I guess?

7-8ft max for the ultrasonics: AP2's neural network is only using 104x160px resolution images • r/teslamotors
Only 10-person team working on NNs: AP2's neural network is only using 104x160px resolution images • r/teslamotors

Full comment stream: overview for PM_YOUR_NIPS_PAPER

 

[lunitiks]

Surprise, surprise...

 

[lunitiks]

I think he means the HW2, HW2.5, and M3 all have different cooling designs.

AFAIK 2.0 and 2.5 does not have different cooling. (Both air cooled.) However they apparently have different temp sensors; HW2 reads board temp while HW2.5 (also?) reads pascal temp

 

[verygreen]

AFAIK 2.0 and 2.5 does not have different cooling. (Both air cooled.) However they apparently have different temp sensors; HW2 reads board temp while HW2.5 (also?) reads pascal temp

They read different sensors, but both are likely present in HW2, it's just due to differences in cooling they need to read different ones too.

 

[tragamin]

With Pascal, maybe the Processor architecture is meant:

Grafikprozessor-Architektur | NVIDIA

 

[lunitiks]

@verygreen do you see any THERM_SHUTDOWN triggers?

 

[verygreen]

With Pascal, maybe the Processor architecture is meant:

Grafikprozessor-Architektur | NVIDIA

yes. parker is the cpu+small 256CUDA cores GPU
Pascal is the big separate CUDA chip.

@verygreen do you see any THERM_SHUTDOWN triggers?

these are unlikely in any scripts

But if the board is more than 88C on startup it refuses to start and waits for cooldown:

        if [ ${MXMTEMP} -gt 88 ] || [ ${PARKERTEMP} -gt 88 ] || [ ${PASCALTEMP} -gt 88 ] ; then
            echo "Board is too hot to start AP services" > /dev/kmsg

They then proceed to wait for the temp to drop below 80 at least.

 

[croman]

Ultrasonics definitely work at speed. I see it detect vehicles and curbs and barriers while driving. Less than 10 feet seems accurate but why upgrade them from ap1 if it's useless? I can see how it doesn't work well but it seems to operate and should be useful for parking autonomously regardless.

 

[verygreen]

Ultrasonics definitely work at speed. I see it detect vehicles and curbs and barriers while driving. Less than 10 feet seems accurate but why upgrade them from ap1 if it's useless? I can see how it doesn't work well but it seems to operate and should be useful for parking autonomously regardless.

I bet those are the side sensors that work. Not the front ones where the air pressure would be when you are driving at speed.

 

[lunitiks]

Ultrasonics definitely work at speed. I see it detect vehicles and curbs and barriers while driving. Less than 10 feet seems accurate but why upgrade them from ap1 if it's useless? I can see how it doesn't work well but it seems to operate and should be useful for parking autonomously regardless.

Perhaps he meant the front sonars?

 

[croman]

I could see that. I luckily haven't tested my front ultrasonics

 

[strangecosmos]

I would love to get some input on this thread about Tesla’s camera specs from the sleuths in this thread. Two-part question: 1) what specs are needed to avoid motion blur and other visual artifacts while driving at high speeds and 2) do Tesla’s Hardware 2 cameras meet those specs?

 

[Tintorera]

7-8ft max for the ultrasonics: AP2's neural network is only using 104x160px resolution images • r/teslamotors

That’s quite a reduction from the advertised 26ft. They are also “supposed” to be used while moving as far as I understand.

From Tesla webpage:

[Ultrasonic]These sensors are useful for detecting nearby cars, especially when they encroach on your lane...