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Structs versus classes
...ject known to be alive as alive. The object on the stack can refer to heap-allocated objects that need to be kept alive, so the GC has to treat stack objects like living heap-allocated objects for the purposes of determining the live set. But obviously they are not treated as "live objects" for the...
The difference between Classes, Objects, and Instances
...cribes the object (instance) word.
When a class is declared, no memory is allocated so class is just a template.
When the object of the class is declared, memory is allocated.
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How to compute the similarity between two text documents?
...ion_map = dict((ord(char), None) for char in string.punctuation)
def stem_tokens(tokens):
return [stemmer.stem(item) for item in tokens]
'''remove punctuation, lowercase, stem'''
def normalize(text):
return stem_tokens(nltk.word_tokenize(text.lower().translate(remove_punctuation_map)))
ve...
“Cloning” row or column vectors
...= 1000
>>> x = np.arange(n)
>>> reps = 10000
Zero-cost allocations
A view does not take any additional memory. Thus, these declarations are instantaneous:
# New axis
x[np.newaxis, ...]
# Broadcast to specific shape
np.broadcast_to(x, (reps, n))
Forced allocation
If you want...
What is `mt=8` in iTunes links for the App Store?
...tidy up the link.
Affiliate Specific Parameters
AT – Affiliate Token: PHG’s affiliate token.
CT – Campaign Token: Also for PHG. This is a value to help you determine (or set) the “campaign” of the link (similar to the “Enhanced Publisher Interface” from Tradedoubler or t...
error C2664: “std::list::list(const std::allocator &)”: 不能将参数 1...
error C2664: “std::list::list(const std::allocator &)”: 不能将参数 1 从 “std::vector”转换为“const std::allocator &”错误日志：error C2664: std::list<_Ty>::list(const std::allocator<_Ty> &): 不能将参数 1 从std::vector<_Ty>转换为const std::...错误日志：
error ...
What is the easiest way to ignore a JPA field during persistence?
...e in Jackson) use @JsonInclude :
@JsonInclude()
@Transient
private String token;
TIP:
You can also use JsonInclude.Include.NON_NULL and hide fields in JSON during deserialization when token == null:
@JsonInclude(JsonInclude.Include.NON_NULL)
@Transient
private String token;
...
What are Runtime.getRuntime().totalMemory() and freeMemory()?
...hy there is a totalMemory() AND a maxMemory(). The answer is that the JVM allocates memory lazily. Lets say you start your Java process as such:
java -Xms64m -Xmx1024m Foo
Your process starts with 64mb of memory, and if and when it needs more (up to 1024m), it will allocate memory. totalMemory...
How can I measure the actual memory usage of an application or process?
...
With ps or similar tools you will only get the amount of memory pages allocated by that process. This number is correct, but:
does not reflect the actual amount of memory used by the application, only the amount of memory reserved for it
can be misleading if pages are shared, for example by s...
How can a time function exist in functional programming?
...actions. This type means: An action of type IO is a function, that takes a token of type RealWorld and returns a new token, together with a result.
The idea behind this is that each IO action mutates the outside state, represented by the magical token RealWorld. Using monads, one can chain multiple...