大约有 1,400 项符合查询结果（耗时：0.0303秒） [XML]
Fast check for NaN in NumPy
... us per loop
In [42]: %timeit np.isnan(np.sum(x))
10000 loops, best of 3: 95.9 us per loop
In [43]: x[50000] = np.nan
In [44]: %timeit np.isnan(np.min(x))
1000 loops, best of 3: 239 us per loop
In [45]: %timeit np.isnan(np.sum(x))
10000 loops, best of 3: 95.8 us per loop
In [46]: x[0] = np.nan
...
Multiple linear regression in Python
...==========
coef std err t P>|t| [95.0% Conf. Int.]
------------------------------------------------------------------------------
x1 0.2424 0.139 1.739 0.098 -0.049 0.534
x2 0.2360 0.149 1.587 ...
How to get the last N rows of a pandas DataFrame?
... edited Feb 19 '19 at 1:21
cs95
231k6060 gold badges391391 silver badges456456 bronze badges
answered Feb 3 '13 at 5:02
...
What is P99 latency?
...from here
Request latency:
min: 0.1
max: 7.2
median: 0.2
p95: 0.5
p99: 1.3
So we can say, 99 percent of web requests, the latency found was 1.3ms (ms/microseconds depends on your system latency measures configured) or lower.
Like @tranmq told if we decrease the P99 latency of ...
How expensive is the lock statement?
...opwatch = new Stopwatch();
const int LoopCount = (int) (100 * 1e6);
int counter = 0;
for (int repetition = 0; repetition < 5; repetition++)
{
stopwatch.Reset();
stopwatch.Start();
for (int i = 0; i &l...
Regular expression to match numbers with or without commas and decimals in text
...+286E000024.487900 -78.4500e.14500 .0140E789. ',
' 081,12.40E07,95.0120 0045,78,123.03500e-0.00 ',
' 0096,78,473.0380e-0. 0008,78,373.066000E0. 0004512300.E0000 ',
' ..18000 25..00 36...77 2..8 ',
' 3.8..9 .12500. 12.51.400 ',
' 00099,11...
Are default enum values in C the same for all compilers?
... E5 = INT_MAX,
#if 0
/* error: overflow in enumeration values */
E6,
#endif
};
int main(void) {
/* If unspecified, the first is 0. */
assert(E0 == 0);
assert(E1 == 1);
/* Repeated number, no problem. */
assert(E2 == 3);
assert(E3 == 3);
/* Continue from the las...
What character to use to put an item at the end of an alphabetic list?
...
TristanTristan
94911 gold badge66 silver badges22 bronze badges
3
...
Sharing a result queue among several processes
... """Dummy function simulating cpu-bound work."""
for _ in range(int(10e6)): # do stuff
pass
return i
if __name__ == '__main__':
with Pool(4) as pool:
print(pool._outqueue) # DEMO
results = [pool.apply_async(busy_foo, (i,)) for i in range(10)]
# `.appl...