I am trying to implement the SVM loss function and its gradient. I found some example projects that implement these two, but I could not figure out how they can use the loss function when computing the gradient. Here is the formula of loss function: What I cannot understand is that how can I use the loss func…
Tag: python
Pythonic way of write if open is successful
I am looking for a pythonic way to create and write to file if opening it was successful or else return an error if not (e.g. permission denied). I was reading here What’s the pythonic way of conditional variable initialization?. Although I’m not sure this method works as I have attempted to test …
Backpropagation with Momentum using Scikit-Learn
I’m trying to use Scikit-Learn’s Neural Network to classify my dataset using a Backpropagation with Momentum. I need to specify these parameters: Hidden neurons, Hidden layers, Training set, Learning rate and Momentum. I found MLPClassifier in Sklearn.neural_network package. The problem is that th…
Increase the size of /dev/shm in Azure ML Studio
I’m trying to execute the following code in Azure ML Studio notebook: and I’m getting this error: With n_jobs=1 it works fine. I think this is because joblib library tries to save my data to /dev/shm. The problem is that it has only 64M capacity: I can’t change this folder by setting JOBLIB_…
Copying the segment from one Excel file to another with python: xlrd and xlsxwriter
I am trying to copy an entire segment of an Excel sheet to another file. The segment is actually a header/description, which mainly describes the attributes of the file, the date it was created, etc… All this takes some cells at first five rows and first 3 columns, say from A1:C3. Here’s the code …
Given a string, call the method with the same name
I am testing multiple algorithms, and want to be able to add algorithms quickly. To do so I want to put algorithms in a list as a string, and then use the string to call the method. I’m also doing a simple timing of the algorithms and don’t want to duplicate the timer code between each method. For…
pip installs packages successfully, but executables not found from command line
I am working on mac OS X Yosemite, version 10.10.3. I installed python2.7 and pip using macport as done in http://johnlaudun.org/20150512-installing-and-setting-pip-with-macports/ I can successfully install packages and import them inside my python environment and python scripts. However any executable associ…
Linking python enums
I have some Enum classes that I want to link up recursively. Looking at the line color = ItemColors[Items(value)._name_].value.value, it seems a bit clunky. Am I misunderstanding something about Enum usage? Is there a better way to do it? Answer Building on @brni’s answer, I came up with a smoother solu…
get mongodb “_id” in django template
My question is related to this question. I am trying to display all the _id of mongo database in django template from last 2 days but unable to get it. This is the error: This is the code I am trying: views.py product.html Though, I tried changing the name to static, cache etc, but still no luck. Answer templ…
(py2.7) long “echo” via subprocess
I’m starting to write some python code to initiate new servers/VM(s) with proxy servers This hasn’t been working due to syntax error so I tried dividing n into But still this syntax error? Thanks! I’ve tried many combinations of ‘ and ” but no luck. Answer The problem is “e…