Building multi-regression model throws error: `Pandas data cast to numpy dtype of object. Check input data with np.asarray(data).`
If X is your dataframe, try using the .astype method to convert to float when running the model:
Python
How to do a Sigma in python 3
A sigma (∑) is a Summation operator. It evaluates a certain expression many times, with slightly different variables, and returns the sum of all those expressions. For example, in the Ballistic coefficient formula The Python implementation would look something like this: You may want to look at the enumerate function, and beware precision problems.
RSA encryption and decryption in Python
In order to make it work you need to convert key from str to tuple before decryption(ast.literal_eval function). Here is fixed code:
Numpy, multiply array with scalar
You can multiply numpy arrays by scalars and it just works. This is also a very fast and efficient operation. With your example:
How does ajax work with python?
Usually, ajax handler on your server should return XML or JSON (I think JSON is better) with the data it needs. So, after getting info from the handler, dump(cast) it into a JSON object and return to client. On client, JavaScript receives this JSON, and after that should dynamically create html elements and insert them … Read more
Is there a math nCr function in python?
The following program calculates nCr in an efficient manner (compared to calculating factorials etc.) As of Python 3.8, binomial coefficients are available in the standard library as math.comb:
ImportError: No module named ‘django.core.urlresolvers’
Django 2.0 removes the django.core.urlresolvers module, which was moved to django.urls in version 1.10. You should change any import to use django.urls instead, like this: Note that Django 2.0 removes some features that previously were in django.core.urlresolvers, so you might have to make some more changes before your code works. See the features deprecated in 1.9 for details on those additional changes.
How to delete a specific line in a file?
First, open the file and get all your lines from the file. Then reopen the file in write mode and write your lines back, except for the line you want to delete: You need to strip(“\n”) the newline character in the comparison because if your file doesn’t end with a newline character the very last … Read more
NaN loss when training regression network
Regression with neural networks is hard to get working because the output is unbounded, so you are especially prone to the exploding gradients problem (the likely cause of the nans). Historically, one key solution to exploding gradients was to reduce the learning rate, but with the advent of per-parameter adaptive learning rate algorithms like Adam, you no … Read more
How to fix ‘RuntimeWarning: divide by zero encountered in double_scalars’
Those are not actual errors, but warnings. They are there because you are trying to divide something by zero. Namely, you are setting M[0] = 0 and then dividing by M[0] (at first iteration, where m = 0) and same for P[0]. The question is, what do you want the first values to be? Maybe a solution would be initialize the … Read more