epoche | A modern , small wiki engine without complexity | Wiki library
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QUESTION
I am working on the pytorch to learn.
And There is a question how to check the output gradient by each layer in my code.
My code is below
...ANSWER
Answered 2021-May-29 at 11:31Well, this is a good question if you need to know the inner computation within your model. Let me explain to you!
So firstly when you print the model
variable you'll get this output:
QUESTION
Lets start with a folder containing 1000 images.
Now if we use no generator and batch_size = 10
and steps_per_epoch = 100
we will have used every picture as 10 * 100 = 1000. So increasing steps_per_epoche
will (rightfully) result in the error:
tensorflow:Your input ran out of data; interrupting training. Make sure that your dataset or generator can generate at least
steps_per_epoch * epochs
batches (in this case, 10000 batches)
On the other hand using a generator will result in endless batches of images:
...ANSWER
Answered 2021-May-19 at 16:39How can a generator (ImageDataGenerator) run out of data?
As far as I know, it creates a tf.data.Dataset
from the generator, which does not run infinitely, that's why you see this behaviour when fitting.
If it was an infinite dataset, then you had to specify steps_per_epoch
.
Edit: If you don't specify steps_per_epoch
then the training will stop when number_of_batches >= len(dataset) // batch_size
. It is done in every epoch.
For to inspect what really happens under the hood you can check the source. As it can be seen a tf.data.Dataset
is created and that handles batch and epoch iteration actually.
QUESTION
I wanted to classify images which consist five classes. I wanted to use CNN. But when I try with several models, the training accuracy will not increase than 20%. Please some one help me to overcome this. Mostly model will trained within 3 epoches and when epoches increase there is no improvement in accuracy. Can anyone suggest me a solution or model or can specify what could be the problem?
Below is one of the model i have used
...ANSWER
Answered 2021-May-04 at 07:06You have to use model.fit() to actually train the model after compiling. Right now, it has randomly initialised weights, and is therefore making random predictions. Since you have five classes, the accuracy is approximately 1/5 = 20%. Training your model may take time depending on model size and amount of data you have.
QUESTION
I downloaded the mnist dataset (jpg) and created a model file with .hdf (.h5).
Images were recognized using the .h5 model, but the recognition rate is low..
.
The accuracy is low when actual compile..
Did I do something wrong?.
.
The image used the 28x28 image of the grayscale..
ANSWER
Answered 2021-Mar-04 at 03:17From here
QUESTION
I have a Spark DataFrame with a timestamp column in milliseconds since the epoche. The column is a string. I now want to transform the column to a readable human time but keep the milliseconds. For example:
1614088453671 -> 23-2-2021 13:54:13.671
Every example i found transforms the timestamp to a normal human readable time without milliseconds.
What i have:
...ANSWER
Answered 2021-Mar-02 at 20:04The time before the milliseconds can be obtained using date_format from_unixtime
, while the milliseconds can be obtained using a modulo. Combine them using format_string
.
QUESTION
I am new to Tensorflow and wrote the following distributed training code. The code works fine.
...ANSWER
Answered 2021-Feb-08 at 07:39OK, I found two solutions here.
Here's the way you probably should do it:
Add some more Keras metrics after accuracy that you can use in computing the confusion matrix:
QUESTION
im trying to build image classification model that will predict if you are wearing a mask.This is a first time i make my own model and when im training it the accuracy jump arround 50% and if i predict it always says "no mask" i tryied changing number of epoches, batch size, number of training data changing model code and nothing works. This is my code:
...ANSWER
Answered 2021-Feb-07 at 12:28This is not the correct combination for binary classification; you should change your loss to binary_crossentropy
and the activation of your last layer to sigmoid
, i.e.:
QUESTION
I face that error RuntimeError: multi-target not supported at /pytorch/aten/src/THCUNN/generic/ClassNLLCriterion.cu:15____
My input is binary vector of 340, target is binary vector of 8, For '"
loss = criterion(outputs, stat_batch)
, I got outputs.shape
= [64,8] and stat_batch.shape
=[64,8]
Here is the model
...ANSWER
Answered 2021-Jan-29 at 19:39Your target stat_batch
must have a shape of (64,)
because nn.CrossEntropyLoss
takes in class indices, not one-hot-encoding.
Either construct your label tensor appropriately or use stat_batch.argmax(axis=1)
instead.
QUESTION
I am using neural network to classify sequence of length 340 to 8 classes, I am using cross entropy as loss. I am getting very high number for the loss . I am wondering if I did mistake in calculating the loss for each epoch. Or should i use other loss function .
...ANSWER
Answered 2021-Jan-31 at 09:40I am getting very high number for the loss
What makes you think this is high? What do you compare this to?
Yes, you should use nn.CrossEntropyLoss
for multi-class classification tasks. And your training loss seems perfectly fine to me. At initialization, you should have loss = -log(1/8) = ~2
.
QUESTION
I'm trying to use VGG16 from keras to train a model for image detection.
Based on these articles (https://www.pyimagesearch.com/2019/06/03/fine-tuning-with-keras-and-deep-learning/ and https://learnopencv.com/keras-tutorial-fine-tuning-using-pre-trained-models/), I've put some addition Dense layer to the VGG 16 model. However, the training accuracy with 20 epoche is around 35% to 41% which doesn't match the result of these articles (above 90%).
Due to this, I would like to know, did I do something wrong with my code below.
Basic setting
...ANSWER
Answered 2021-Jan-26 at 23:48what is the form of the content of y_train. If they are integer values then you need to convert them to one hot vectors with
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