ValueError: total size of new array must be unchanged
I had the same issue. I found that I changed the data length. A product of reshape arguments should be equal to a length of an array which you are changing. In your case:
python
Import file from parent directory?
I have the following directory structure: application/main.py contains some functions. tests/main.py will contain my tests for these functions but I can’t import the top level main.py. I get the following error: I am attempting to import using the following syntax: What am I doing wrong?
Maximum value for long integer
Long integers: There is no explicitly defined limit. The amount of available address space forms a practical limit.(Taken from this site). See the docs on Numeric Types where you’ll see that Long integers have unlimited precision. In Python 2, Integers will automatically switch to longs when they grow beyond their limit: for integers we have maxint and maxsize: The maximum … Read more
Compare two columns using pandas
You could use np.where. If cond is a boolean array, and A and B are arrays, then defines C to be equal to A where cond is True, and B where cond is False. yields If you have more than one condition, then you could use np.select instead. For example, if you wish df[‘que’] to … Read more
Python Pandas : pivot table with aggfunc = count unique distinct
Do you mean something like this? Note that using len assumes you don’t have NAs in your DataFrame. You can do x.value_counts().count() or len(x.dropna().unique()) otherwise.
Issues with installing python libraries on Windows : CondaHTTPError: HTTP 000 CONNECTION FAILED for url
Execute the following command in the cmd prompt/terminal: conda config –set ssl_verify no
Run Rsync from Python [duplicate]
I need to run an rsync command from Python. Is this possible and if so, how do I do it?
How to create a new database using SQLAlchemy?
On postgres, three databases are normally present by default. If you are able to connect as a superuser (eg, the postgres role), then you can connect to the postgres or template1 databases. The default pg_hba.conf permits only the unix user named postgres to use the postgres role, so the simplest thing is to just become that user. At any rate, create an engine as usual … Read more
CS231n: How to calculate gradient for Softmax loss function?
Not sure if this helps, but: is really the indicator function , as described here. This forms the expression (j == y[i]) in the code. Also, the gradient of the loss with respect to the weights is: where which is the origin of the X[:,i] in the code.
How do I restart a program based on user input?
Try this: The inner while loop loops until the input is either ‘y’ or ‘n’. If the input is ‘y’, the while loop starts again (continue keyword skips the remaining code and goes straight to the next iteration). If the input is ‘n’, the program ends.