Update demonstration example

README.md

@@ -30,6 +30,28 @@ TensorFlowASR implements some automatic speech recognition architectures such as
 - Support `transducer` tflite greedy decoding (conversion and invocation)
 - Distributed training using `tf.distribute.MirroredStrategy`
 
+## Table of Contents
+<!-- TOC -->
+
+- [What's New?](#whats-new)
+- [Table of Contents](#table-of-contents)
+- [:yum: Supported Models](#yum-supported-models)
+- [Installation](#installation)
+  - [Installing via PyPi](#installing-via-pypi)
+  - [Installing from source](#installing-from-source)
+- [Setup training and testing](#setup-training-and-testing)
+- [TFLite Convertion](#tflite-convertion)
+- [Features Extraction](#features-extraction)
+- [Augmentations](#augmentations)
+- [Training & Testing](#training--testing)
+- [Corpus Sources and Pretrained Models](#corpus-sources-and-pretrained-models)
+  - [English](#english)
+  - [Vietnamese](#vietnamese)
+  - [German](#german)
+- [References & Credits](#references--credits)
+
+<!-- /TOC -->
+
 ## :yum: Supported Models
 
 - **CTCModel** (End2end models using CTC Loss for training)
@@ -43,26 +65,44 @@ TensorFlowASR implements some automatic speech recognition architectures such as
 - **Streaming Transducer** (Reference: [https://arxiv.org/abs/1811.06621](https://arxiv.org/abs/1811.06621))
   See [examples/streaming_transducer](./examples/streaming_transducer)
 
-## Setup Environment and Datasets
+## Installation
 
-Install tensorflow: `pip3 install -U tensorflow` or `pip3 install tf-nightly` (for using tflite)
+For training and testing, you should use `git clone` for installing necessary packages from other authors (`ctc_decoders`, `rnnt_loss`, etc.)
 
-Install packages (choose _one_ of these options):
+### Installing via PyPi
 
-- Run `pip3 install -U TensorFlowASR`
-- Clone the repo and run `python3 setup.py install` in the repo's directory
+Run `pip3 install -U TensorFlowASR`
 
-For **setting up datasets**, see [datasets](./tensorflow_asr/datasets/README.md)
+### Installing from source
 
-- For _training, testing and using_ **CTC Models**, run `./scripts/install_ctc_decoders.sh`
+```bash
+git clone https://github.com/TensorSpeech/TensorFlowASR.git
+cd TensorFlowASR
+python3 setup.py install
+```
 
-- For _training_ **Transducer Models**, export `CUDA_HOME` and run `./scripts/install_rnnt_loss.sh`
+For anaconda3:
+
+```bash
+conda create -y -n tfasr tensorflow-gpu python=3.7 # tensorflow if using CPU
+conda activate tfasr
+pip install -U tensorflow-gpu # upgrade to latest version of tensorflow 
+git clone https://github.com/TensorSpeech/TensorFlowASR.git
+cd TensorFlowASR
+python setup.py install
+```
+
+## Setup training and testing
+
+- For datasets, see [datasets](./tensorflow_asr/datasets/README.md)
+
+- For _training, testing and using_ **CTC Models**, run `./scripts/install_ctc_decoders.sh`
 
-- Method `tensorflow_asr.utils.setup_environment()` enable **mixed_precision** if available.
+- For _training_ **Transducer Models**, run `export CUDA_HOME=/usr/local/cuda && ./scripts/install_rnnt_loss.sh` (**Note**: only `export CUDA_HOME` when you have CUDA)
 
-- To enable XLA, run `TF_XLA_FLAGS=--tf_xla_auto_jit=2 $python_train_script`
+- For _mixed precision training_, use flag `--mxp` when running python scripts from [examples](./examples)
 
-Clean up: `python3 setup.py clean --all` (this will remove `/build` contents)
+- For _enabling XLA_, run `TF_XLA_FLAGS=--tf_xla_auto_jit=2 python3 $path_to_py_script`)
 
 ## TFLite Convertion
 

examples/demonstration/conformer.py

@@ -13,44 +13,65 @@
 # limitations under the License.
 
 import argparse
-import tensorflow as tf
+from tensorflow_asr.utils import setup_environment, setup_devices
 
-from tensorflow_asr.featurizers.speech_featurizers import read_raw_audio
+setup_environment()
+import tensorflow as tf
 
 parser = argparse.ArgumentParser(prog="Conformer non streaming")
 
 parser.add_argument("filename", metavar="FILENAME",
                     help="audio file to be played back")
 
-parser.add_argument("--tflite", type=str, default=None,
-                    help="Path to conformer tflite")
+parser.add_argument("--config", type=str, default=None,
+                    help="Path to conformer config yaml")
+
+parser.add_argument("--saved", type=str, default=None,
+                    help="Path to conformer saved h5 weights")
 
 parser.add_argument("--blank", type=int, default=0,
                     help="Path to conformer tflite")
 
+parser.add_argument("--num_rnns", type=int, default=1,
+                    help="Number of RNN layers in prediction network")
+
+parser.add_argument("--nstates", type=int, default=2,
+                    help="Number of RNN states in prediction network (1 for GRU and 2 for LSTM)")
+
 parser.add_argument("--statesize", type=int, default=320,
-                    help="Path to conformer tflite")
+                    help="Size of RNN state in prediction network")
+
+parser.add_argument("--device", type=int, default=0,
+                    help="Device's id to run test on")
+
+parser.add_argument("--cpu", default=False, action="store_true",
+                    help="Whether to only use cpu")
 
 args = parser.parse_args()
 
-tflitemodel = tf.lite.Interpreter(model_path=args.tflite)
+setup_devices([args.device], cpu=args.cpu)
+
+from tensorflow_asr.configs.config import Config
+from tensorflow_asr.featurizers.speech_featurizers import read_raw_audio
+from tensorflow_asr.featurizers.speech_featurizers import TFSpeechFeaturizer
+from tensorflow_asr.featurizers.text_featurizers import CharFeaturizer
+from tensorflow_asr.models.conformer import Conformer
+
+config = Config(args.config, learning=False)
+speech_featurizer = TFSpeechFeaturizer(config.speech_config)
+text_featurizer = CharFeaturizer(config.decoder_config)
+
+# build model
+conformer = Conformer(**config.model_config, vocabulary_size=text_featurizer.num_classes)
+conformer._build(speech_featurizer.shape)
+conformer.load_weights(args.saved, by_name=True)
+conformer.summary(line_length=120)
+conformer.add_featurizers(speech_featurizer, text_featurizer)
 
 signal = read_raw_audio(args.filename)
+predicted = tf.constant(args.blank, dtype=tf.int32)
+states = tf.zeros([args.num_rnns, args.nstates, 1, args.statesize], dtype=tf.float32)
 
-input_details = tflitemodel.get_input_details()
-output_details = tflitemodel.get_output_details()
-tflitemodel.resize_tensor_input(input_details[0]["index"], signal.shape)
-tflitemodel.allocate_tensors()
-tflitemodel.set_tensor(input_details[0]["index"], signal)
-tflitemodel.set_tensor(
-    input_details[1]["index"],
-    tf.constant(args.blank, dtype=tf.int32)
-)
-tflitemodel.set_tensor(
-    input_details[2]["index"],
-    tf.zeros([1, 2, 1, args.statesize], dtype=tf.float32)
-)
-tflitemodel.invoke()
-hyp = tflitemodel.get_tensor(output_details[0]["index"])
+hyp, _, _ = conformer.recognize_tflite(signal, predicted, states)
 
 print("".join([chr(u) for u in hyp]))

examples/demonstration/streaming_conformer.py → examples/demonstration/streaming_tflite_conformer.py

@@ -57,6 +57,18 @@ def int_or_str(text):
 parser.add_argument("--tflite", type=str, default=None,
                     help="Path to conformer tflite")
 
+parser.add_argument("--blank", type=int, default=0,
+                    help="Path to conformer tflite")
+
+parser.add_argument("--num_rnns", type=int, default=1,
+                    help="Number of RNN layers in prediction network")
+
+parser.add_argument("--nstates", type=int, default=2,
+                    help="Number of RNN states in prediction network (1 for GRU and 2 for LSTM)")
+
+parser.add_argument("--statesize", type=int, default=320,
+                    help="Size of RNN state in prediction network")
+
 args = parser.parse_args(remaining)
 
 if args.blocksize == 0:
@@ -92,8 +104,8 @@ def recognize(signal, lastid, states):
         text = "".join([chr(u) for u in upoints])
         return text, lastid, states
 
-    lastid = np.zeros(shape=[], dtype=np.int32)
-    states = np.zeros(shape=[1, 2, 1, 320], dtype=np.float32)
+    lastid = args.blank * np.ones(shape=[], dtype=np.int32)
+    states = np.zeros(shape=[args.num_rnns, args.nstates, 1, args.statesize], dtype=np.float32)
     transcript = ""
 
     while True:

examples/demonstration/tflite_conformer.py

@@ -0,0 +1,62 @@
+# Copyright 2020 Huy Le Nguyen (@usimarit)
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import argparse
+import tensorflow as tf
+
+from tensorflow_asr.featurizers.speech_featurizers import read_raw_audio
+
+parser = argparse.ArgumentParser(prog="Conformer non streaming")
+
+parser.add_argument("filename", metavar="FILENAME",
+                    help="Audio file to be played back")
+
+parser.add_argument("--tflite", type=str, default=None,
+                    help="Path to conformer tflite")
+
+parser.add_argument("--blank", type=int, default=0,
+                    help="Blank index")
+
+parser.add_argument("--num_rnns", type=int, default=1,
+                    help="Number of RNN layers in prediction network")
+
+parser.add_argument("--nstates", type=int, default=2,
+                    help="Number of RNN states in prediction network (1 for GRU and 2 for LSTM)")
+
+parser.add_argument("--statesize", type=int, default=320,
+                    help="Size of RNN state in prediction network")
+
+args = parser.parse_args()
+
+tflitemodel = tf.lite.Interpreter(model_path=args.tflite)
+
+signal = read_raw_audio(args.filename)
+
+input_details = tflitemodel.get_input_details()
+output_details = tflitemodel.get_output_details()
+tflitemodel.resize_tensor_input(input_details[0]["index"], signal.shape)
+tflitemodel.allocate_tensors()
+tflitemodel.set_tensor(input_details[0]["index"], signal)
+tflitemodel.set_tensor(
+    input_details[1]["index"],
+    tf.constant(args.blank, dtype=tf.int32)
+)
+tflitemodel.set_tensor(
+    input_details[2]["index"],
+    tf.zeros([args.num_rnns, args.nstates, 1, args.statesize], dtype=tf.float32)
+)
+tflitemodel.invoke()
+hyp = tflitemodel.get_tensor(output_details[0]["index"])
+
+print("".join([chr(u) for u in hyp]))

tensorflow_asr/utils/metrics.py

@@ -11,13 +11,15 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
+
+from typing import Tuple
 import numpy as np
 import tensorflow as tf
 from nltk.metrics import distance
 from .utils import bytes_to_string
 
 
-def wer(decode: np.ndarray, target: np.ndarray) -> (tf.Tensor, tf.Tensor):
+def wer(decode: np.ndarray, target: np.ndarray) -> Tuple[tf.Tensor, tf.Tensor]:
     """Word Error Rate
 
     Args:
@@ -43,7 +45,7 @@ def wer(decode: np.ndarray, target: np.ndarray) -> (tf.Tensor, tf.Tensor):
     return tf.convert_to_tensor(dis, tf.float32), tf.convert_to_tensor(length, tf.float32)
 
 
-def cer(decode: np.ndarray, target: np.ndarray) -> (tf.Tensor, tf.Tensor):
+def cer(decode: np.ndarray, target: np.ndarray) -> Tuple[tf.Tensor, tf.Tensor]:
     """Character Error Rate
 
     Args: