Recent questions tagged NumPy

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numpy - Keras: ValueError: decode_predictions expects a batch of predictions

I'm using keras' pre-trained model VGG16, following this link: Keras VGG16 I'm trying to decode the ... is highly appreciated. Thank you. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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numpy - python - how to compute correlation-matrix with nans in data-matrix

I coundn't find a function that computes a matrix of correlation coefficients for arrays containing observations for more ... the use of loops. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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numpy - Python: confusion between types and dtypes

Suppose I enter: a = uint8(200) a*2 Then the result is 400, and it is recast to be of type uint16. ... produce values outside the range 0-255? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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numpy - Cannot use 128bit float in Python on 64bit architecture

I checked the size of a pointer in my python terminal (in Enthought Canopy IDE) via import ctypes print ( ... releaselevel='final', serial=0) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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numpy - python: OpenCV depth of image unsupported (CV_64F)

So, I'm trying to show a binary picture with only black and white using this code: import cv2 import numpy as np ... > 'depth' is 6 (CV_64F). See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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numpy - How to do matrix vector inner products for each pair separate in python?

Lets say, I have bunch of matrices As and vectors bs. As = array([[[1, 7], [3, 8]], [[2, 1], [5 ... that can do this for me? (fast and efficent) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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numpy - Possible conflicting python installations

I'm not sure if the default python installation is the one that I've been installing modules to, and if that ... 7/dist-packages Cleaning up... See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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numpy - set new index for pandas DataFrame (interpolating?)

I have a DataFrame where the index is NOT time. I need to rescale all of the values from an old index which ... Thanks in advance for any help. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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numpy - How to set time zone of values in a Pandas DataFrame?

I'd like to set the time zone of the values of a column in a Pandas DataFrame. I am reading the DataFrame with pandas.read_csv(). See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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numpy - How to declare 2D c-arrays dynamically in Cython

I need to perform a lot of work using 2D numpy arrays of various sizes and I would like to offload these ... False Thanks @Veedrac for the tip! See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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numpy - plus/minus operator for python ±

I am looking for a way to do a plus/minus operation in python 2 or 3. I do not know the command or ... to do this. Am I missing something? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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numpy - Higher order local interpolation of implicit curves in Python

Given a set of points describing some trajectory in the 2D plane, I would like to provide a smooth representation ... trajectory') plt.show() See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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593 views

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numpy - Python builtin "all" with generators

I have the following problem with python's "all" and generators: G = (a for a in [0,1]) all(list(G)) ... ) Thank you all for your help! -maciej See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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numpy - Python PIL bitmap/png from array with mode=1

Playing with PIL (and numpy) for the first time ever. I was trying to generate a black and white checkerboard image ... .9.0 wheel==0.24.0 See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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821 views

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numpy - Error in creating LMDB database file in Python for Caffe

I'm trying to create an LMDB data base file in Python to be used with Caffe according to this tutorial. ... why this error might be occuring? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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763 views

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numpy - python matplotlib plot sparse matrix pattern

Given a sparse binary matrix A (csr, coo, whatever) I want to make a plot such that I can see the ... pattern in my sparse matrix. Thanks See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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564 views

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numpy - Why python broadcasting in the example below is slower than a simple loop?

I have an array of vectors and compute the norm of their diffs vs the first one. When ... d/1GKzpLGSqz9eScHYFAuT8wJt4UIZ3ZTru/view?usp=sharing See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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794 views

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numpy - Same Python code, same data, different results on different machines

I have a very strange problem that I get different results on the same code and same data on different machines. ... but it didn't help. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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761 views

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numpy - Randomly shuffle a sparse matrix in python

is there an easy way to shuffle a sparse matrix in python? This is how I shuffle a non-sparse matrix: index = ... can I do it with numpy sparse? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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691 views

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numpy - Is it possible to speed up this loop in Python?

The normal way to map a function in a numpy.narray like np.array[map(some_func,x)] or vectorize(f)(x) can't ... it needs nearly 40 GB of memory. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.7k views

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numpy - ValueError: Can't convert non-rectangular Python sequence to Tensor

I want to change list to tensor with tf.convert_to_tensor, data is following: data=[ array([0., 0., 0., ... Tensor. how to solve this problem? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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682 views

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numpy - Is it possible to speed up this loop in Python?

The normal way to map a function in a numpy.narray like np.array[map(some_func,x)] or vectorize(f)(x) can't ... it needs nearly 40 GB of memory. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.6k views

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numpy - ValueError: Can't convert non-rectangular Python sequence to Tensor

I want to change list to tensor with tf.convert_to_tensor, data is following: data=[ array([0., 0., 0., ... Tensor. how to solve this problem? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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594 views

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numpy - Multiply two matrix by columns with python

I have two matrix: A = [a11 a12 a21 a22] B = [b11 b12 b21 b22] And I want to multiply all its ... Neither np.matrix.prod. Thanks in advance. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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851 views

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numpy - More efficient weighted Gini coefficient in Python

Per https://stackoverflow.com/a/48981834/1840471, this is an implementation of the weighted Gini coefficient in Python: ... Mine is ~150k rows. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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558 views

1 answer

numpy - How to check the size of a float in python?

I want to check whether a float is actually 32 or 64bits (and the number of bits of a numpy float array). There ... but just didn't find out... See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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710 views

1 answer

numpy - Fastest way to get all the points between two (X,Y) coordinates in python

So I have a shapely LineString: print np.round(shapely_intersecting_lines.coords).astype(np.int) >>> array([[ ... a vectorized solution to this. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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562 views

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numpy python 3.4.1 installation: Python 3.4 not found in registry

I have two python versions on my computer 2.7 and 3.4.1 . I have tried to install numpy by pip3.4 which ... My system is windows 7 64 bit. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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