Skip to content

Instantly share code, notes, and snippets.

@jboner
jboner / latency.txt
Last active July 30, 2024 02:24
Latency Numbers Every Programmer Should Know
Latency Comparison Numbers (~2012)
----------------------------------
L1 cache reference 0.5 ns
Branch mispredict 5 ns
L2 cache reference 7 ns 14x L1 cache
Mutex lock/unlock 25 ns
Main memory reference 100 ns 20x L2 cache, 200x L1 cache
Compress 1K bytes with Zippy 3,000 ns 3 us
Send 1K bytes over 1 Gbps network 10,000 ns 10 us
Read 4K randomly from SSD* 150,000 ns 150 us ~1GB/sec SSD
@karpathy
karpathy / min-char-rnn.py
Last active July 29, 2024 00:13
Minimal character-level language model with a Vanilla Recurrent Neural Network, in Python/numpy
"""
Minimal character-level Vanilla RNN model. Written by Andrej Karpathy (@karpathy)
BSD License
"""
import numpy as np
# data I/O
data = open('input.txt', 'r').read() # should be simple plain text file
chars = list(set(data))
data_size, vocab_size = len(data), len(chars)
@liudanking
liudanking / kera_retrain_model.py
Created June 9, 2018 11:05
Retrain model with keras based on resnet
from keras import applications
from keras.preprocessing.image import ImageDataGenerator
from keras import optimizers
from keras.models import Sequential, Model
from keras.layers import Dropout, Flatten, Dense, GlobalAveragePooling2D
from keras import backend as k
from keras.callbacks import ModelCheckpoint, LearningRateScheduler, TensorBoard, EarlyStopping
img_width, img_height = 256, 256
train_data_dir = "tf_files/codoon_photos"
@swedishmike
swedishmike / gist:902fb27d627313c31a95e31c44e302ac
Created October 17, 2019 13:07
Adding and removing virtual environments to Jupyter notebook
## Create the virtual environment
conda create -n 'environment_name'
## Activate the virtual environment
conda activate 'environment_name'
## Make sure that ipykernel is installed
pip install --user ipykernel
## Add the new virtual environment to Jupyter