How to read image from numpy array into PIL Image?

I am trying to read an image from a numpy array using PIL, by doing the following: from PIL import Image import numpy as np #img is a np array with shape (3,256,256) Image.fromarray(img) and am...

Writing data to LMDB with Python very slow

Creating datasets for training with Caffe I both tried using HDF5 and LMDB. However, creating a LMDB is very slow even slower than HDF5. I am trying to write ~20,000 images. Am I doing something...

How to use convert_imageset in caffe for images which are not put in one folder?

I'm trying to train a CNN on my own dataset using Caffe framework, and it is highly recommended that the dataset be converted to the lmdb or leveldb formats due to speed efficiency. To do so, all...

How do I count and enumerate the keys in an lmdb with python?

import lmdb env = lmdb.open(path_to_lmdb) Now I seem to need to create a transaction and a cursor, but how do I get a list of keys that I can iterate over?

Caffe: Reading LMDB from Python

I've extracted features using caffe, which generates a .mdb file. Then I'm trying to read it using Python and display it as a readable number. import lmdb lmdb_env =...

Count number of records in lmdb databse with python

I open a lmdb database using this code: lmdb_env = lmdb.open(source_path, readonly=True) How can I count the number of records in this database?

What is special about internal design of LMDB?

What would be the performance difference (reads/writes) between some C++ implementation of in-memory B-Tree (for example google btree) and the LMDB (without taking into consideration all the...

No data is read when using lmdb cursor in Python

I have a lmdb database and I'm trying to read its contents. The irony is nothing gets printed on screen. This is the code snippet that I have written for reading from lmdb: import caffe import...

Backward pass in Caffe Python Layer is not called/working?

I am unsuccessfully trying to implement a simple loss layer in Python using Caffe. As reference, I found several layers implemented in Python, including here, here and here. Starting with the...

Reconstruct image from final convolutional layer

I have trained a image deblurring network. I have used Euclidean loss between reconstructed image and groundTruth image as my loss function. I get a euclidean loss of about 3.0 for a image of size...

Understanding LMDB, I have Three Questions

The below was an email I addressed to their mailing list. But I never got any response nor was my membership ever acknowledged. So I'm asking here. QUERY A: On the LMDB site, it mentions: "it has...

Script cannot find python libraries and numpy when I try to install caffe on Windows 10

I have been using this resource to install caffe on my Windows 10 system. I started by installing the necessary dependencies for Python via the command prompt: C:\Users\MYNAME>conda config --add...

How to store large values (10MB) using key-value store database?

Consider a system that requires the store of mostly small values (1-1000 bytes), but in some cases, it needs to store a large value (10MB). It contains a list of hashes (think a list of public...

lmdb.BadRslotError: mdb_txn_begin: MDB_BAD_RSLOT: Invalid reuse of reader locktable slot?

I've been experimenting with nearest neighbor algorithm for images with the style presented in this post (i.e. goal is to see how many nearly similar images there is). After getting the example...

AttributeError: 'NoneType' object has no attribute 'astype'

I encountered the following problem when I reproduce the ESRGAN related program. libpng error: Read Error Traceback (most recent call last): File "/sda/ZTL/B/codes/train.py", line 173, in...

how to convert the annotation.xml files into train.txt and val.txt for object detection?

I'm training custom image data sets for object detection using caffe. Here i have train and validation directory. By using LabelImg , the object annotation created in a .xml file for each image...

How do I open a LMDB database in Java?

I am trying to open a LMDB database using its Java API. This is my Database class: import java.io.File; import java.nio.ByteBuffer; import java.nio.file.Paths; import org.lmdbjava.Dbi; import...

Why is postgres faster than LMDB?

I compared Postgres and LMDB by inserting 1 Million entries into each which have a mix of unique ID's and some array type values. In Postgres i used jsonb to store the array and in LMDB as...

Fast key-value disk storage for Python

I'm wondering if there is a fast on-disk key-value storage with Python bindings which supports millions of read/write calls to separate keys. My problem involves counting word co-occurrences in a...

How to correctly insert duplicate keys in lmdb?

According to the documentation (https://lmdb.readthedocs.org/en/release/), passing dupsort to open_db() should allow duplicate keys to be added to an lmdb database. But that seems to not be the...

Does opening of multiple lmdb-environments within the same client process has a legitimate use case or is it redundant?

§1 1 lmdb environment corresponds to one database file on the disk. §2 Theoretically, the same client process, could call the lmdb-c-api, multiple times, to instantiate different...

lmdb stores the data inefficiently?

I'm looking for a data file structure that enables fast reading of random data samples for deep learning, and have been experimenting with lmdb today. However, one thing that seems surprising to...

lmdb.Error: There is not enough space on the disk

I just encountered below error in python3 that seems related in lmdb package and my disk or ram space. My ram is 8GB and HDD is 900GB. it seemed that 1099511627776 byte is about 1TB. It is ram...

What's a simple key-value storage system that's cheaper than Redis?

I am writing a simple app, split in front end / back end, the latter being in node.js I do need to save some data (basically caching). The idea is to have a process running every day or so that...

Maximum LMDB value size

Is there a maximum size of value that can be inserted into an LMDB database? I am trying to insert a 16GB file into an LMDB which is initialized to size 32GB and I obtain this error: File...

Trouble installing turbodbc

I am attempting to install turbodbc on my Ubuntu 20.10 machine. My specs are as follows: pip 20.2.4, Python 3.8.5 , gcc (Ubuntu 10.2.0-13ubuntu1) 10.2.0 I have attempted the solutions provided in...

Segmentation fault (core dumped) on training the deep neural network /torch/cuda/__init__.py", line 172 in _lazy_init

python3 -q -X faulthandler test.py --model.backbone=resnet18 2021-02-07 20:14:21.198583: I tensorflow/stream_executor/platform/default/dso_loader.cc:49] Successfully opened dynamic library...

Increase max key size LMDB key value database in python?

I have an application where I need to use long keys to store values in a key value store database. If I try to store a value using a long key (greater than 511 bytes) in lmdb, using the python...

‘CUDNN_STATUS_VERSION_MISMATCH’ error while installing caffe

I tried the caffe installation with the instruction of http://caffe.berkeleyvision.org/installation.html , the ubuntu installation command sudo apt install caffe-cudadoesn't work at all with the...

Sudden Tensorflow / Keras Google Colab dependency problems `AttributeError: module 'tensorflow._api.v1.compat.v2' has no attribute '__internal__'`

I have running a machine learning model (Matterport's Mask R-CNN) in google colab for a couple of weeks. All of a sudden today I am unable to run any of my notebooks due to I think some kind of...