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<body>
<main>
<article id="content">
<header>
<h1 class="title">Module <code>ktrain.text.predictor</code></h1>
</header>
<section id="section-intro">
<details class="source">
<summary>
<span>Expand source code</span>
</summary>
<pre><code class="python">from .. import utils as U
from ..imports import *
from ..predictor import Predictor
from .preprocessor import TextPreprocessor, TransformersPreprocessor, detect_text_format
class TextPredictor(Predictor):
"""
```
predicts text classes
```
"""
def __init__(self, model, preproc, batch_size=U.DEFAULT_BS):
if not isinstance(model, keras.Model):
raise ValueError("model must be of instance keras.Model")
if not isinstance(preproc, TextPreprocessor):
# if type(preproc).__name__ != 'TextPreprocessor':
raise ValueError("preproc must be a TextPreprocessor object")
self.model = model
self.preproc = preproc
self.c = self.preproc.get_classes()
self.batch_size = batch_size
def get_classes(self):
return self.c
def predict(self, texts, return_proba=False, verbose=0):
"""
```
Makes predictions for a list of strings where each string is a document
or text snippet.
If return_proba is True, returns probabilities of each class.
Args:
texts(str|list): For text classification, texts should be either a str or
a list of str.
For sentence pair classification, texts should be either
a tuple of form (str, str) or list of tuples.
A single tuple of the form (str, str) is automatically treated as sentence pair classification, so
please refrain from using tuples for text classification tasks.
return_proba(bool): If True, return probabilities instead of predicted class labels
verbose(int): verbosity: 0 (silent), 1 (progress bar), 2 (single line)
```
"""
is_array, is_pair = detect_text_format(texts)
if not is_array:
texts = [texts]
classification, multilabel = U.is_classifier(self.model)
# get predictions
if U.is_huggingface(model=self.model):
tseq = self.preproc.preprocess_test(texts, verbose=0)
tseq.batch_size = self.batch_size
tfd = tseq.to_tfdataset(train=False)
preds = self.model.predict(tfd, verbose=verbose)
if hasattr(
preds, "logits"
): # dep_fix: breaking change - also needed for LongFormer
# if type(preds).__name__ == 'TFSequenceClassifierOutput': # dep_fix: undocumented breaking change in transformers==4.0.0
# REFERENCE: https://discuss.huggingface.co/t/new-model-output-types/195
preds = preds.logits
# dep_fix: transformers in TF 2.2.0 returns a tuple insead of NumPy array for some reason
if isinstance(preds, tuple) and len(preds) == 1:
preds = preds[0]
else:
texts = self.preproc.preprocess(texts)
preds = self.model.predict(
texts, batch_size=self.batch_size, verbose=verbose
)
# process predictions
if U.is_huggingface(model=self.model):
# convert logits to probabilities for Hugging Face models
if multilabel and self.c:
preds = keras.activations.sigmoid(tf.convert_to_tensor(preds)).numpy()
elif self.c:
preds = keras.activations.softmax(tf.convert_to_tensor(preds)).numpy()
else:
preds = np.squeeze(preds)
if len(preds.shape) == 0:
preds = np.expand_dims(preds, -1)
result = (
preds
if return_proba or multilabel or not self.c
else [self.c[np.argmax(pred)] for pred in preds]
)
if multilabel and not return_proba:
result = [list(zip(self.c, r)) for r in result]
if not is_array:
return result[0]
else:
return result
def predict_proba(self, texts, verbose=0):
"""
```
Makes predictions for a list of strings where each string is a document
or text snippet.
Returns probabilities of each class.
```
"""
return self.predict(texts, return_proba=True, verbose=verbose)
def explain(self, doc, truncate_len=512, all_targets=False, n_samples=2500):
"""
Highlights text to explain prediction
Args:
doc (str): text of documnet
truncate_len(int): truncate document to this many words
all_targets(bool): If True, show visualization for
each target.
n_samples(int): number of samples to generate and train on.
Larger values give better results, but will take more time.
Lower this value if explain is taking too long.
"""
is_array, is_pair = detect_text_format(doc)
if is_pair:
warnings.warn(
"currently_unsupported: explain does not currently support sentence pair classification"
)
return
if not self.c:
warnings.warn(
"currently_unsupported: explain does not support text regression"
)
return
try:
import eli5
from eli5.lime import TextExplainer
except:
msg = (
"ktrain requires a forked version of eli5 to support tf.keras. "
+ "Install with: pip install https://github.com/amaiya/eli5-tf/archive/refs/heads/master.zip"
)
warnings.warn(msg)
return
if not isinstance(doc, str):
raise TypeError("text must of type str")
prediction = [self.predict(doc)] if not all_targets else None
if self.preproc.is_nospace_lang():
doc = self.preproc.process_chinese([doc])
doc = doc[0]
doc = " ".join(doc.split()[:truncate_len])
te = TextExplainer(random_state=42, n_samples=n_samples)
_ = te.fit(doc, self.predict_proba)
return te.show_prediction(
target_names=self.preproc.get_classes(), targets=prediction
)
def _save_model(self, fpath):
if isinstance(self.preproc, TransformersPreprocessor):
self.model.save_pretrained(fpath)
# As of 0.26.3, make sure we save tokenizer in predictor folder
tok = self.preproc.get_tokenizer()
tok.save_pretrained(fpath)
else:
super()._save_model(fpath)
return</code></pre>
</details>
</section>
<section>
</section>
<section>
</section>
<section>
</section>
<section>
<h2 class="section-title" id="header-classes">Classes</h2>
<dl>
<dt id="ktrain.text.predictor.TextPredictor"><code class="flex name class">
<span>class <span class="ident">TextPredictor</span></span>
<span>(</span><span>model, preproc, batch_size=32)</span>
</code></dt>
<dd>
<div class="desc"><pre><code>predicts text classes
</code></pre></div>
<details class="source">
<summary>
<span>Expand source code</span>
</summary>
<pre><code class="python">class TextPredictor(Predictor):
"""
```
predicts text classes
```
"""
def __init__(self, model, preproc, batch_size=U.DEFAULT_BS):
if not isinstance(model, keras.Model):
raise ValueError("model must be of instance keras.Model")
if not isinstance(preproc, TextPreprocessor):
# if type(preproc).__name__ != 'TextPreprocessor':
raise ValueError("preproc must be a TextPreprocessor object")
self.model = model
self.preproc = preproc
self.c = self.preproc.get_classes()
self.batch_size = batch_size
def get_classes(self):
return self.c
def predict(self, texts, return_proba=False, verbose=0):
"""
```
Makes predictions for a list of strings where each string is a document
or text snippet.
If return_proba is True, returns probabilities of each class.
Args:
texts(str|list): For text classification, texts should be either a str or
a list of str.
For sentence pair classification, texts should be either
a tuple of form (str, str) or list of tuples.
A single tuple of the form (str, str) is automatically treated as sentence pair classification, so
please refrain from using tuples for text classification tasks.
return_proba(bool): If True, return probabilities instead of predicted class labels
verbose(int): verbosity: 0 (silent), 1 (progress bar), 2 (single line)
```
"""
is_array, is_pair = detect_text_format(texts)
if not is_array:
texts = [texts]
classification, multilabel = U.is_classifier(self.model)
# get predictions
if U.is_huggingface(model=self.model):
tseq = self.preproc.preprocess_test(texts, verbose=0)
tseq.batch_size = self.batch_size
tfd = tseq.to_tfdataset(train=False)
preds = self.model.predict(tfd, verbose=verbose)
if hasattr(
preds, "logits"
): # dep_fix: breaking change - also needed for LongFormer
# if type(preds).__name__ == 'TFSequenceClassifierOutput': # dep_fix: undocumented breaking change in transformers==4.0.0
# REFERENCE: https://discuss.huggingface.co/t/new-model-output-types/195
preds = preds.logits
# dep_fix: transformers in TF 2.2.0 returns a tuple insead of NumPy array for some reason
if isinstance(preds, tuple) and len(preds) == 1:
preds = preds[0]
else:
texts = self.preproc.preprocess(texts)
preds = self.model.predict(
texts, batch_size=self.batch_size, verbose=verbose
)
# process predictions
if U.is_huggingface(model=self.model):
# convert logits to probabilities for Hugging Face models
if multilabel and self.c:
preds = keras.activations.sigmoid(tf.convert_to_tensor(preds)).numpy()
elif self.c:
preds = keras.activations.softmax(tf.convert_to_tensor(preds)).numpy()
else:
preds = np.squeeze(preds)
if len(preds.shape) == 0:
preds = np.expand_dims(preds, -1)
result = (
preds
if return_proba or multilabel or not self.c
else [self.c[np.argmax(pred)] for pred in preds]
)
if multilabel and not return_proba:
result = [list(zip(self.c, r)) for r in result]
if not is_array:
return result[0]
else:
return result
def predict_proba(self, texts, verbose=0):
"""
```
Makes predictions for a list of strings where each string is a document
or text snippet.
Returns probabilities of each class.
```
"""
return self.predict(texts, return_proba=True, verbose=verbose)
def explain(self, doc, truncate_len=512, all_targets=False, n_samples=2500):
"""
Highlights text to explain prediction
Args:
doc (str): text of documnet
truncate_len(int): truncate document to this many words
all_targets(bool): If True, show visualization for
each target.
n_samples(int): number of samples to generate and train on.
Larger values give better results, but will take more time.
Lower this value if explain is taking too long.
"""
is_array, is_pair = detect_text_format(doc)
if is_pair:
warnings.warn(
"currently_unsupported: explain does not currently support sentence pair classification"
)
return
if not self.c:
warnings.warn(
"currently_unsupported: explain does not support text regression"
)
return
try:
import eli5
from eli5.lime import TextExplainer
except:
msg = (
"ktrain requires a forked version of eli5 to support tf.keras. "
+ "Install with: pip install https://github.com/amaiya/eli5-tf/archive/refs/heads/master.zip"
)
warnings.warn(msg)
return
if not isinstance(doc, str):
raise TypeError("text must of type str")
prediction = [self.predict(doc)] if not all_targets else None
if self.preproc.is_nospace_lang():
doc = self.preproc.process_chinese([doc])
doc = doc[0]
doc = " ".join(doc.split()[:truncate_len])
te = TextExplainer(random_state=42, n_samples=n_samples)
_ = te.fit(doc, self.predict_proba)
return te.show_prediction(
target_names=self.preproc.get_classes(), targets=prediction
)
def _save_model(self, fpath):
if isinstance(self.preproc, TransformersPreprocessor):
self.model.save_pretrained(fpath)
# As of 0.26.3, make sure we save tokenizer in predictor folder
tok = self.preproc.get_tokenizer()
tok.save_pretrained(fpath)
else:
super()._save_model(fpath)
return</code></pre>
</details>
<h3>Ancestors</h3>
<ul class="hlist">
<li><a title="ktrain.predictor.Predictor" href="../predictor.html#ktrain.predictor.Predictor">Predictor</a></li>
<li>abc.ABC</li>
</ul>
<h3>Methods</h3>
<dl>
<dt id="ktrain.text.predictor.TextPredictor.explain"><code class="name flex">
<span>def <span class="ident">explain</span></span>(<span>self, doc, truncate_len=512, all_targets=False, n_samples=2500)</span>
</code></dt>
<dd>
<div class="desc"><p>Highlights text to explain prediction</p>
<h2 id="args">Args</h2>
<dl>
<dt><strong><code>doc</code></strong> : <code>str</code></dt>
<dd>text of documnet</dd>
</dl>
<p>truncate_len(int): truncate document to this many words
all_targets(bool):
If True, show visualization for
each target.
n_samples(int): number of samples to generate and train on.
Larger values give better results, but will take more time.
Lower this value if explain is taking too long.</p></div>
<details class="source">
<summary>
<span>Expand source code</span>
</summary>
<pre><code class="python">def explain(self, doc, truncate_len=512, all_targets=False, n_samples=2500):
"""
Highlights text to explain prediction
Args:
doc (str): text of documnet
truncate_len(int): truncate document to this many words
all_targets(bool): If True, show visualization for
each target.
n_samples(int): number of samples to generate and train on.
Larger values give better results, but will take more time.
Lower this value if explain is taking too long.
"""
is_array, is_pair = detect_text_format(doc)
if is_pair:
warnings.warn(
"currently_unsupported: explain does not currently support sentence pair classification"
)
return
if not self.c:
warnings.warn(
"currently_unsupported: explain does not support text regression"
)
return
try:
import eli5
from eli5.lime import TextExplainer
except:
msg = (
"ktrain requires a forked version of eli5 to support tf.keras. "
+ "Install with: pip install https://github.com/amaiya/eli5-tf/archive/refs/heads/master.zip"
)
warnings.warn(msg)
return
if not isinstance(doc, str):
raise TypeError("text must of type str")
prediction = [self.predict(doc)] if not all_targets else None
if self.preproc.is_nospace_lang():
doc = self.preproc.process_chinese([doc])
doc = doc[0]
doc = " ".join(doc.split()[:truncate_len])
te = TextExplainer(random_state=42, n_samples=n_samples)
_ = te.fit(doc, self.predict_proba)
return te.show_prediction(
target_names=self.preproc.get_classes(), targets=prediction
)</code></pre>
</details>
</dd>
<dt id="ktrain.text.predictor.TextPredictor.get_classes"><code class="name flex">
<span>def <span class="ident">get_classes</span></span>(<span>self)</span>
</code></dt>
<dd>
<div class="desc"></div>
<details class="source">
<summary>
<span>Expand source code</span>
</summary>
<pre><code class="python">def get_classes(self):
return self.c</code></pre>
</details>
</dd>
<dt id="ktrain.text.predictor.TextPredictor.predict"><code class="name flex">
<span>def <span class="ident">predict</span></span>(<span>self, texts, return_proba=False, verbose=0)</span>
</code></dt>
<dd>
<div class="desc"><pre><code>
Makes predictions for a list of strings where each string is a document
or text snippet.
If return_proba is True, returns probabilities of each class.
Args:
texts(str|list): For text classification, texts should be either a str or
a list of str.
For sentence pair classification, texts should be either
a tuple of form (str, str) or list of tuples.
A single tuple of the form (str, str) is automatically treated as sentence pair classification, so
please refrain from using tuples for text classification tasks.
return_proba(bool): If True, return probabilities instead of predicted class labels
verbose(int): verbosity: 0 (silent), 1 (progress bar), 2 (single line)
</code></pre></div>
<details class="source">
<summary>
<span>Expand source code</span>
</summary>
<pre><code class="python">def predict(self, texts, return_proba=False, verbose=0):
"""
```
Makes predictions for a list of strings where each string is a document
or text snippet.
If return_proba is True, returns probabilities of each class.
Args:
texts(str|list): For text classification, texts should be either a str or
a list of str.
For sentence pair classification, texts should be either
a tuple of form (str, str) or list of tuples.
A single tuple of the form (str, str) is automatically treated as sentence pair classification, so
please refrain from using tuples for text classification tasks.
return_proba(bool): If True, return probabilities instead of predicted class labels
verbose(int): verbosity: 0 (silent), 1 (progress bar), 2 (single line)
```
"""
is_array, is_pair = detect_text_format(texts)
if not is_array:
texts = [texts]
classification, multilabel = U.is_classifier(self.model)
# get predictions
if U.is_huggingface(model=self.model):
tseq = self.preproc.preprocess_test(texts, verbose=0)
tseq.batch_size = self.batch_size
tfd = tseq.to_tfdataset(train=False)
preds = self.model.predict(tfd, verbose=verbose)
if hasattr(
preds, "logits"
): # dep_fix: breaking change - also needed for LongFormer
# if type(preds).__name__ == 'TFSequenceClassifierOutput': # dep_fix: undocumented breaking change in transformers==4.0.0
# REFERENCE: https://discuss.huggingface.co/t/new-model-output-types/195
preds = preds.logits
# dep_fix: transformers in TF 2.2.0 returns a tuple insead of NumPy array for some reason
if isinstance(preds, tuple) and len(preds) == 1:
preds = preds[0]
else:
texts = self.preproc.preprocess(texts)
preds = self.model.predict(
texts, batch_size=self.batch_size, verbose=verbose
)
# process predictions
if U.is_huggingface(model=self.model):
# convert logits to probabilities for Hugging Face models
if multilabel and self.c:
preds = keras.activations.sigmoid(tf.convert_to_tensor(preds)).numpy()
elif self.c:
preds = keras.activations.softmax(tf.convert_to_tensor(preds)).numpy()
else:
preds = np.squeeze(preds)
if len(preds.shape) == 0:
preds = np.expand_dims(preds, -1)
result = (
preds
if return_proba or multilabel or not self.c
else [self.c[np.argmax(pred)] for pred in preds]
)
if multilabel and not return_proba:
result = [list(zip(self.c, r)) for r in result]
if not is_array:
return result[0]
else:
return result</code></pre>
</details>
</dd>
<dt id="ktrain.text.predictor.TextPredictor.predict_proba"><code class="name flex">
<span>def <span class="ident">predict_proba</span></span>(<span>self, texts, verbose=0)</span>
</code></dt>
<dd>
<div class="desc"><pre><code>Makes predictions for a list of strings where each string is a document
or text snippet.
Returns probabilities of each class.
</code></pre></div>
<details class="source">
<summary>
<span>Expand source code</span>
</summary>
<pre><code class="python">def predict_proba(self, texts, verbose=0):
"""
```
Makes predictions for a list of strings where each string is a document
or text snippet.
Returns probabilities of each class.
```
"""
return self.predict(texts, return_proba=True, verbose=verbose)</code></pre>
</details>
</dd>
</dl>
<h3>Inherited members</h3>
<ul class="hlist">
<li><code><b><a title="ktrain.predictor.Predictor" href="../predictor.html#ktrain.predictor.Predictor">Predictor</a></b></code>:
<ul class="hlist">
<li><code><a title="ktrain.predictor.Predictor.create_onnx_session" href="../predictor.html#ktrain.predictor.Predictor.create_onnx_session">create_onnx_session</a></code></li>
<li><code><a title="ktrain.predictor.Predictor.export_model_to_onnx" href="../predictor.html#ktrain.predictor.Predictor.export_model_to_onnx">export_model_to_onnx</a></code></li>
<li><code><a title="ktrain.predictor.Predictor.export_model_to_tflite" href="../predictor.html#ktrain.predictor.Predictor.export_model_to_tflite">export_model_to_tflite</a></code></li>
<li><code><a title="ktrain.predictor.Predictor.save" href="../predictor.html#ktrain.predictor.Predictor.save">save</a></code></li>
</ul>
</li>
</ul>
</dd>
</dl>
</section>
</article>
<nav id="sidebar">
<h1>Index</h1>
<div class="toc">
<ul></ul>
</div>
<ul id="index">
<li><h3>Super-module</h3>
<ul>
<li><code><a title="ktrain.text" href="index.html">ktrain.text</a></code></li>
</ul>
</li>
<li><h3><a href="#header-classes">Classes</a></h3>
<ul>
<li>
<h4><code><a title="ktrain.text.predictor.TextPredictor" href="#ktrain.text.predictor.TextPredictor">TextPredictor</a></code></h4>
<ul class="">
<li><code><a title="ktrain.text.predictor.TextPredictor.explain" href="#ktrain.text.predictor.TextPredictor.explain">explain</a></code></li>
<li><code><a title="ktrain.text.predictor.TextPredictor.get_classes" href="#ktrain.text.predictor.TextPredictor.get_classes">get_classes</a></code></li>
<li><code><a title="ktrain.text.predictor.TextPredictor.predict" href="#ktrain.text.predictor.TextPredictor.predict">predict</a></code></li>
<li><code><a title="ktrain.text.predictor.TextPredictor.predict_proba" href="#ktrain.text.predictor.TextPredictor.predict_proba">predict_proba</a></code></li>
</ul>
</li>
</ul>
</li>
</ul>
</nav>
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