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How do I determine k when using k-means clustering?
...klearn.cluster import KMeans
from sklearn.metrics import silhouette_score
range_n_clusters = [2, 3, 4] # clusters range you want to select
dataToFit = [[12,23],[112,46],[45,23]] # sample data
best_clusters = 0 # best cluster number which you will get
previous_silh_...
How do I use IValidatableObject?
...idatableObject
{
[Required]
public bool Enable { get; set; }
[Range(1, 5)]
public int Prop1 { get; set; }
[Range(1, 5)]
public int Prop2 { get; set; }
public IEnumerable<ValidationResult> Validate(ValidationContext validationContext)
{
var results = n...
How do you log content of a JSON object in Node.js?
...
To have an output more similar to the raw console.log(obj) I usually do use console.log('Status: ' + util.inspect(obj)) (JSON is slightly different).
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imp...
Print in one line dynamically
...ased on your code:
from sys import stdout
from time import sleep
for i in range(1,20):
stdout.write("\r%d" % i)
stdout.flush()
sleep(1)
stdout.write("\n") # move the cursor to the next line
Some things about this that may be surprising:
The \r goes at the beginning of the string so ...
Does JavaScript have the interface type (such as Java's 'interface')?
...ew TypeError('Value must be numeric');
}
//latitude is in range between 0 and 90
if(prop == 'lat' && !(0 < val && val < 90)) {
throw new RangeError('Position is out of range!');
}
//longitude is in range between 0 and 180
...
Why does direction of index matter in MongoDB?
...The order of the nodes in the tree is irrelevant.
If you are returning a range of nodes - The elements close to each other will be down the same branches of the tree. The closer the nodes are in the range the quicker they can be retrieved.
With a single field index - The order won't matter. If ...
When is each sorting algorithm used? [closed]
...worth a try:
Counting sort: When you are sorting integers with a limited range.
Radix sort: When log(N) is significantly larger than K, where K is the number of radix digits.
Bucket sort: When you can guarantee that your input is approximately uniformly distributed.
...
Fast check for NaN in NumPy
...a n: numpy.random.rand(n),
kernels=[min, sum, dot, any, einsum],
n_range=[2 ** k for k in range(20)],
logx=True,
logy=True,
xlabel="len(a)",
)
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...
Is it possible to specify your own distance function using scikit-learn K-Means Clustering?
... X.shape, centres.shape, delta, maxiter, metric)
allx = np.arange(N)
prevdist = 0
for jiter in range( 1, maxiter+1 ):
D = cdist_sparse( X, centres, metric=metric, p=p ) # |X| x |centres|
xtoc = D.argmin(axis=1) # X -> nearest centre
distances = D[a...
How to get HTTP Response Code using Selenium WebDriver
...s":{"frameId":"3928.1","requestId":"3928.1","response":{"headers":{"Accept-Ranges":"bytes","Keep-Alive":"timeout=4, max=100","Cache-Control":"max-age=300","Server":"Apache/2.2.22 (Ubuntu)","Connection":"Keep-Alive","Content-Encoding":"gzip","Vary":"Accept-Encoding","Expires":"Tue, 11 Oct 2016 14:13:...