text_dataset_from_directory
Generate a tf.data.Dataset from text files in a directory
Description
Generate a tf.data.Dataset from text files in a directory
Usage
text_dataset_from_directory(
directory,
labels = "inferred",
label_mode = "int",
class_names = NULL,
batch_size = 32L,
max_length = NULL,
shuffle = TRUE,
seed = NULL,
validation_split = NULL,
subset = NULL,
follow_links = FALSE,
...
) Arguments
| Arguments | Description |
|---|---|
| directory | Directory where the data is located. If labels is “inferred”, it should contain subdirectories, each containing text files for a class. Otherwise, the directory structure is ignored. |
| labels | Either “inferred” (labels are generated from the directory structure), NULL (no labels), or a list of integer labels of the same size as the number of text files found in the directory. Labels should be sorted according to the alphanumeric order of the text file paths (obtained via os.walk(directory) in Python). |
| label_mode | - 'int': means that the labels are encoded as integers (e.g. for sparse_categorical_crossentropy loss). - 'categorical' means that the labels are encoded as a categorical vector (e.g. for categorical_crossentropy loss). - 'binary' means that the labels (there can be only 2) are encoded as float32 scalars with values 0 or 1 (e.g. for binary_crossentropy). - NULL (no labels). |
| class_names | Only valid if labels is "inferred". This is the explicit list of class names (must match names of subdirectories). Used to control the order of the classes (otherwise alphanumerical order is used). |
| batch_size | Size of the batches of data. Default: 32. |
| max_length | Maximum size of a text string. Texts longer than this will be truncated to max_length. |
| shuffle | Whether to shuffle the data. Default: TRUE. If set to FALSE, sorts the data in alphanumeric order. |
| seed | Optional random seed for shuffling and transformations. |
| validation_split | Optional float between 0 and 1, fraction of data to reserve for validation. |
| subset | One of “training” or “validation”. Only used if validation_split is set. |
| follow_links | Whether to visits subdirectories pointed to by symlinks. Defaults to FALSE. |
| … | For future compatibility (unused presently). |
Details
If your directory structure is: ```
main_directory/
…class_a/
……a_text_1.txt
……a_text_2.txt
…class_b/
……b_text_1.txt
……b_text_2.txt
``Then callingtext_dataset_from_directory(main_directory, labels = ‘inferred’)will return atf.data.Datasetthat yields batches of texts from the subdirectoriesclass_aandclass_b, together with labels 0 and 1 (0 corresponding toclass_aand 1 corresponding toclass_b). Only.txt` files are supported at this time.