Questions tagged [npz-file]
14 questions
38
votes
2 answers
What is the advantage of saving `.npz` files instead of `.npy` in python, regarding speed, memory and look-up?
The python documentation for the numpy.savez which saves an .npz file is:
The .npz file format is a zipped archive of files named after the variables they contain. The archive is not compressed and each file in the archive contains one variable in…
SuperCiocia
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2
votes
1 answer
Modify only a few bytes from a npz numpy file without rewriting the whole file
This works to write and load a numpy array + metadata in a .npz compressed file (here the compression is useless because it's random, but anyway):
import numpy as np
# save
D = {"x": np.random.random((10000, 1000)), "metadata": {"date": "20221123",…
Basj
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1
vote
1 answer
Load NPZ sparse matrix in R
How can I read a sparse matrix that I have saved with Python as a *.npz file in R? I already came across two answers* on Stackoverflow but neither seems to do the job in my case.
The data set was created with Python from a Pandas data frame…
Stücke
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1
vote
2 answers
problem in visualized image derived from npz file
I am trying to open and visualize images of different ct slices in a npz formatted file to proceed my NN segmentation task later on.
I used the following code:
data = np.load('case0005_slice060.npz')
image = data['image']
img =…
Alireza Samadi
- 55
- 7
1
vote
1 answer
Fast access to numpy npz data
I have saved many data files as .npz to save space on storage (savez_compressed). Each file is saved as one array, so when using the numpy load function, it returns the key to a dictionary that contains the array.
How can you store this array as an…
user-2147482637
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0
votes
2 answers
python output from a file like image, or npz file
I’ve tried to read a npz file and it turn out the output like below
b’PK\x04\x03\x14\x00\x00\x00\x07\x00\x05\x00!\x00M\xd05\xda\xa1\xb7\
x00\x00\x00\x07\x01\x00\x00\x06\x00\x14\x00PK.npy\x01\x00\x10\x00.
I know it is unreadable for human but I…
heidii
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0
votes
1 answer
reading and decoding a .tfrecord file, and saving it to .npz file or reading it in numpy/pytorch
I'm currently working on implementing a pytorch version of this tensorflow project. They published a paper which can be found here.
Dataset formats and where to find them
The datasets available are .tfrecord files, which can be downloaded with a…
0
votes
1 answer
Merging multiple .npz files into single .npz file
I have multiple .npz files in folder with same nature, I want to append all of my .npz files into a single .npz file present in a given folder
I have tried below code to achieve so, but it seems its not appending multiple .npz files to single npz…
Sanidhya Chuahan
- 1
- 1
0
votes
0 answers
Python merging npz files , array with dtype S3
I have two npz file, downloaded from Biobank :
The first file is chr6_24000001_27000001.gz and the second is chr6_25000001_28000001.gz.
Based on previous suggestion here and here , I reazlied that my files containng five arrays and tried to…
Reza
- 1
0
votes
0 answers
zipfile.BadZipFile: Bad CRC-32 for file [...]
I am training a deep learning model using Python 3.9 / Pytorch 1.12.1 / numpy 1.23.1.
My data is in NPZ format; the dataloader gets several items within NPZ arrays. One of them is an array of dimensions 192x256x1x12.
After creating the data (always…
0
votes
1 answer
Load npz file complains about "ModuleNotFoundError"
I am saving some data to a npz file and then load it. But when I try to access a part of it, depending on where I run the loading script, it complains about ModuleNotFoundError (and the module name is a file where the data was saved was using, but…
João P.
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0
votes
1 answer
Load multiple numpy arrays from npz file in multiple arrays in automated way
I have a npz file that looks like this.
data = np.load('Data_5_iteration.npz') # Load data from file
keys = list(data.keys()) # all keys in the dictionary
print(keys)
(base) hell@hell:~$ ['nodes', 'temperature', 'max_iter', 'best_error_vec',…
Prakhar Sharma
- 543
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0
votes
1 answer
how to load dictionary from npy file efficiently in Python
I have a file in .npz format. Data stored in dictionary formatlooks like:
{'ffa7e85e21c9000215574a8e2c24c30d': array([[ 0.07772359, 0.04581502, -0.00930751, ..., -0.05222392,
0.02600432, 0.00974964],
[ 0.1211272 , -0.0978327 , …
Sweety Tripathi
- 25
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0
votes
0 answers
How to read and convert TSV file into NPZ with base64
I have TSV file with headers and some values. I want to read it and convert it into base 64 and later to NPZ format. I have a code as follows:
import base64
import numpy as np
import csv
import sys
import zlib
import time
import…
RA FI
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