![]() ![]() This is enough to warrant a broader discussion of how they will change cities and society.Ĭruise and Waymo are close to being authorized to provide all-day commercial robotaxi service throughout virtually all of San Francisco. It remains to be seen whether robotaxis are ready for deployment on a significant scale, or what the metric for determining readiness would even be.But barring a significant shift in momentum, like an economic shock, a horrific tragedy, or a dramatic political pivot, robotaxis are positioned to continue their roll. The mere fact that these vehicles are programmed to follow traffic laws and the speed limit automatically makes them feel like safer drivers than a large percentage of humans on the road. While not perfect, my most recent Cruise ride, in April, was sufficiently close to the experience of riding with a responsible human driver that I momentarily forgot I was in a robotaxi. Cruise, on the other hand, claims that its robotaxis experienced 53% fewer collisions than the typical human ride-hail driver in San Francisco in their first million driverless miles, and 73% fewer collisions with a meaningful risk of injury. The company cautions against direct comparisons with human drivers because there are rarely analogous data sets. In a paper on its first million “rider-only” miles, Waymo had two police-reportable crashes (with no injuries) and 18 minor contact events, about half of which involved a human driver hitting a stationary Waymo. Unfortunately, there is no standard, government-approved framework for evaluating the safety of autonomous vehicles. They can be unleashed within a strictly limited area where they’re well trained their use can be closely monitored by the company that designed them and they can immediately be pulled off the road in bad weather or if there’s another issue. Robotaxis are operationally quite different from personally owned autonomous vehicles, and they are in a much better position for commercial deployment. Over the past few years, Cruise and Waymo have cleared several major regulatory hurdles, expanded into new markets, and racked up over a million relatively uneventful, truly driverless miles each in major American cities. These critical stories, though important, obscure the general trend, which has been moving steadily in the robotaxi industry’s favor. San Francisco officials have documented at least 92 such incidents in just six months, including three that disrupted emergency responders. Cruise’s driverless vehicles, in particular, have shown an alarming tendency to inexplicably stop in the middle of the road, blocking traffic for extended periods of time. Journalists (myself included) have highlighted strange robo-behavior, concerning software failures, and Cruise and Waymo’s lack of transparency about their data. ![]() Media coverage of robotaxis has been rightfully skeptical. ![]() Int bitsInByteflyLUT::bitsInByte(byte _byte)įor (unsigned int i = 0 i < (1 << CHAR_BIT) i += 1)Ĭout << i << " " << flut.Get_bitsInByte(i) << endl Ĭonstexpr T m1 = stBitPattern::res(0x55) //binary: 0101.Ĭonstexpr T m2 = stBitPattern::res(0x33) //binary: 00110011.Ĭonstexpr T m4 = stBitPattern::res(0x0f) //binary: 4 zeros, 4 ones. If (flyLUT = DUMMY) // if its first time we try to get answer for this char.įlyLUT = bitsInByte(_byte) // O(8) ![]() Int bitsInByteflyLUT::Get_bitsInByte(byte _byte) Memset(flyLUT, DUMMY, sizeof(int)*nIndexes) O(8) for finding how many bits are ON in a byte.īitsInByteflyLUT(const bitsInByteflyLUT & _class) // COPY CTOR - forbiddenĬonst bitsInByteflyLUT & operator= (const bitsInByteflyLUT& _class) after that its O(1) īitsInByteflyLUT() //CTOR - throws std::bad_alloc first approch : activate the O(8) function in first get try. #include // for CHAR_BIT (most likely to be 8) Here is the scheme published there for counting bits in 32 bit words in C: unsigned int v // count bits set in this (32-bit value) Instead you combine values by shifting and masking in clever ways.Ī great source of clever tricks for doing this is Bit Hacks. These tend to be pure arithmetic, since you can't realistically lookup a 32 bit value in an array to get its bitcount. If you do it a lot, you are better off batching up bytes into words or doublewords, and doing fast bitcount operations on these. If you only do this once in awhile, it is likely the fastest, but then you don't need the fastest if you only do it once in awhile. That kind of works for bytes, but you pay an actual memory access for it. The usual answer for "fastest way to do bitcount" is "look up the byte in an array". ![]()
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