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Remove a file descriptor being tracked by a polling object. Just like the 100% Authentic Sale Online JIASHA 2018 Spring Summer White Shoes Women Flat PU Leather Purchase Cheap Online Buy Cheap New Styles DqIfnZ
method, fd can be an integer or an object with a fileno() method that returns an integer.

Attempting to remove a file descriptor that was never registered is safely ignored.

Polls the set of registered file descriptors, and returns a possibly-empty list containing (fd, event) 2-tuples for the descriptors that have events or errors to report. fd is the file descriptor, and event is a bitmask with bits set for the reported events for that descriptor — POLLIN for waiting input, POLLOUT to indicate that the descriptor can be written to, and so forth. An empty list indicates that the call timed out and no file descriptors had any events to report. If timeout is given, it specifies the length of time in milliseconds which the system will wait for events before returning. If timeout is omitted, -1, or HUANQIU Sneakers Casual Shoes Flats Platform Shoes Mesh Air Affordable Cheap Sale Low Cost Authentic 18xJM
, the call will block until there is an event for this poll object.

Changed in version 3.5: The function is now retried with a recomputed timeout when interrupted by a signal, except if the signal handler raises an exception (see Women Fashion Monogrammed Beach Summer Dresses Cheap Deals High Quality 100% Authentic For Sale Buy Cheap Huge Surprise New Release v2zvrRt
for the rationale), instead of raising .

https://linux.die.net/man/4/epoll

Close the control file descriptor of the epoll object.

True if the epoll object is closed.

Return the file descriptor number of the control fd.

Create an epoll object from a given file descriptor.

Register a fd descriptor with the epoll object.

Modify a registered file descriptor.

Remove a registered file descriptor from the epoll object.

Wait for events. timeout in seconds (float)

Changed in version 3.5: The function is now retried with a recomputed timeout when interrupted by a signal, except if the signal handler raises an exception (see Outlet Newest Best Store To Get Cheap Price China New Indoor Soccer ShoesFootball BootsSport Men Shoes Unisex jttGOt
for the rationale), instead of raising .

The poll() system call, supported on most Unix systems, provides better scalability for network servers that service many, many clients at the same time. poll() scales better because the system call only requires listing the file descriptors of interest, while select() builds a bitmap, turns on bits for the fds of interest, and then afterward the whole bitmap has to be linearly scanned again. select() is O(highest file descriptor), while poll() is O(number of file descriptors).

A reading of 8,000m, with trailing zeroes and no decimal point, is ambiguous; the trailing zeroes may or may not be intended as significant figures. To avoid this ambiguity, the number could be represented in scientific notation: 8.0×10 3 m indicates that the first zero is significant (hence a margin of 50m) while 8.000×10 3 m indicates that all three zeroes are significant, giving a margin of 0.5m. Similarly, it is possible to use a multiple of the basic measurement unit: 8.0km is equivalent to 8.0×10 3 m. In fact, it indicates a margin of 0.05km (50m). However, reliance on this convention can lead to false precision errors when accepting data from sources that do not obey it. For example, a source reporting a number like 153,753 with precision +/- 5,000 looks like it has precision +/- 0.5. Under the convention it would have been rounded to 154,000.

Precision includes:

According to ISO 5725-1, Accuracy consists of Trueness (proximity of measurement results to the true value) and Precision (repeatability or reproducibility of the measurement)

A shift in the meaning of these terms appeared with the publication of the ISO 5725 series of standards in 1994, which is also reflected in the 2008 issue of the "BIPM International Vocabulary of Metrology" (VIM), items 2.13 and 2.14. [1]

According to ISO 5725-1, Factory New products lady casual board women shoe women cheap platform shoes Cheap Sale Brand New Unisex Looking For Cheap Online 2018 Unisex Cheap Online x1Sh1ywBJ
the general term " accuracy " is used to describe the closeness of a measurement to the true value. When the term is applied to sets of measurements of the same measurand , it involves a component of random error and a component of systematic error. In this case trueness is the closeness of the mean of a set of measurement results to the actual (true) value and precision is the closeness of agreement among a set of results.

ISO 5725-1 and VIM also avoid the use of the term "", previously specified in BS 5497-1, [6] because it has different connotations outside the fields of science and engineering, as in medicine and law.

Accuracy of a target grouping according to BIPM and ISO 5725
Low accuracy due to poor precision
Low accuracy due to poor trueness
Main article: Evaluation of binary classifiers

Accuracy is also used as a statistical measure of how well a binary classification test correctly identifies or excludes a condition. That is, the accuracy is the proportion of true results (both Sue Lucky 2018 fancy girls star kids infant slip dress summer clothes sleeveless dress clothing New Fashion Style Of Classic irtgO
and true negatives ) among the total number of cases examined. [7] To make the context clear by the semantics, it is often referred to as the "Rand accuracy" or " Rand index ". Fashion Comfortable Breathable Mesh men Running Sport Shoes Clearance Store Cheap Online 7fxVNr
[9] [10] It is a parameter of the test.

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