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What's is the difference between train, validation and test set, in neural networks?
...is used only for testing the final solution in order to confirm the actual predictive power of the network.
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Exposing database IDs - security risk?
...dress a resource, which is subject to access control.
Another challenge is prediction or discover of the identifiers. The easiest way for an attacker to discover an unauthorized object is to guess it from a numbering sequence. The following guidelines can help mitigate that:
Expose only unpredictab...
Math.random() versus Random.nextInt(int)
...
According to this example Random.nextInt(n) has less predictable output then Math.random() * n. According to [sorted array faster than an unsorted array][1] I think we can say Random.nextInt(n) is hard to predict.
usingRandomClass : time:328 milesecond.
usingMathsRandom : tim...
Why use softmax as opposed to standard normalization?
...x function can be seen as trying to minimize the cross-entropy between the predictions and the truth.
Probabilistic View - from this perspective we are in fact looking at the log-probabilities, thus when we perform exponentiation we end up with the raw probabilities. In this case the softmax equatio...
If vs. Switch Speed
...ction neutering modern cpu jump target buffers and so wipes out the branch predictor. I vaguely recall a paper at a GCC conference on codegen for switches.
– olliej
Jan 14 '09 at 23:46
...
Amazon SimpleDB vs Amazon DynamoDB
...e the best parts of
the original Dynamo design (incremental scalability, predictable high
performance) with the best parts of SimpleDB (ease of administration
of a cloud service, consistency, and a table-based data model that is
richer than a pure key-value store).
Werner's Summary suggest...
Storing JSON in database vs. having a new column for each key
...s or JSON. It depends on what you need to do with it later. What is your predicted way of accessing this data? Will you need to cross reference other data?
Other people have answered pretty well what the technical trade-off are.
Not many people have discussed that your app and features evolve...
Approximate cost to access various caches and main memory?
...ravel a 1 ft (30.5cm) distance
5 ns - CPU L1 iCACHE Branch mispredict
7 ns - CPU L2 CACHE reference
71 ns - CPU cross-QPI/NUMA best case on XEON E5-46*
100 ns - MUTEX lock/unlock
100 ns - own DDR MEMORY reference
135 ns - CPU c...
string.ToLower() and string.ToLowerInvariant()
...date
If your application depends on the case of a string changing in a predictable way that is unaffected by the current culture, use the ToLowerInvariant method. The ToLowerInvariant method is equivalent to ToLower(CultureInfo.InvariantCulture). The method is recommended when a collection of st...
When to throw an exception?
... thumb is to use exceptions in the case of something you couldn't normally predict. Examples are database connectivity, missing file on disk, etc. For scenarios that you can predict, ie users attempting to log in with a bad password you should be using functions that return booleans and know how t...