ASR

Train on spectrogram / mfcc

• In tensorflow/examples/speech_commands/input_data.py, line 487, use self.mfcc_ or self.spectrogram
• In tensorflow/examples/speech_commands/models.py, line 50, comment/uncomment things with mfcc / spectrogram title

Change number of filters

• In tensorflow/examples/speech_commands/models.py, line 242, change first_filter_count

Change number of steps

• In tensorflow/examples/speech_commands/train.py, line 381, change default

Visualize

Print layers of CNN:

• python tensorflow\python\tools\inspect_checkpoint.py --file_name=D:\tmp\speech_commands_train\conv.ckpt-18000 (windows)
• python tensorflow/python/tools/inspect_checkpoint.py --file_name=/tmp/speech_commands_train/conv.ckpt-18000(linux)

Results in:

Variable (DT_FLOAT) [20,8,1,64]
Variable_1 (DT_FLOAT) [64]
Variable_2 (DT_FLOAT) [10,4,64,64]
Variable_3 (DT_FLOAT) [64]
Variable_4 (DT_FLOAT) [62720,12]
Variable_5 (DT_FLOAT) [12]
global_step (DT_INT64) []

Visualize convolutional layers

• python vis_conv_layer1.py

Visualize spectrogram and mfcc

• (optional) choose which file to visualize by setting the input_wav
• python wav_to_spectrogram

Results

MFCC (40coeff) + 64 filters

• 15000 steps (0.001 learning_rate), 3000 steps (0.0001 learning_rate) = total 18000s
• acc = 89%

MFCC (40 coeff) + 32 filters

• 15000 steps (0.001 learning_rate), 3000 steps (0.0001 learning_rate) = total 18000s
• acc = 88.3%
• training time: 70 min

MFCC (40 coeff) + 21 filters (optimal according to calculation)

• 15000 steps (0.001 learning_rate), 3000 steps (0.0001 learning_rate) = total 18000s
• acc =

MFCC (40 coeff) + 16 filters

• 15000 steps (0.001 learning_rate), 3000 steps (0.0001 learning_rate) = total 18000s
• acc = 86.6%

MFCC (40 coeff) + 16 filters v2

• 15000 steps (0.001 learning_rate), 3000 steps (0.0001 learning_rate) = total 18000s
• acc = 87.2%

MFCC (40 coeff) + 8 filters

• 15000 steps (0.001 learning_rate), 3000 steps (0.0001 learning_rate) = total 18000s
• acc = 85.8%

MFCC (40 coeff) + 8 filters v2

• 15000 steps (0.001 learning_rate), 3000 steps (0.0001 learning_rate) = total 18000s
• acc = 85.9%

MFCC (40 coeff) + 4 filters

• 15000 steps (0.001 learning_rate), 3000 steps (0.0001 learning_rate) = total 18000s
• acc = 81.3%
• training time: 67 min

MFCC (40 coeff) + 2 filters

• 15000 steps (0.001 learning_rate), 3000 steps (0.0001 learning_rate) = total 18000s
• acc = 77.2%

spectrogram + 64 filters

• 15000 steps (0.001 learning_rate), 3000 steps (0.0001 learning_rate) = total 18000s
• acc = 65.8%
• training time: 120 min

spectrogram + 64 filters + extra steps

• 30000 steps (0.001 learning_rate), 6000 steps (0.0001 learning_rate) = total 36000s
• acc = 76.4%
• training time: 240 min

spectrogram + 32 filters + extra steps

• 30000 steps (0.001 learning_rate), 6000 steps (0.0001 learning_rate) = total 36000s
• acc = 76.0%
• training time: 180 min

spectrogram + 16 filters + extra steps

• 30000 steps (0.001 learning_rate), 6000 steps (0.0001 learning_rate) = total 36000s
• acc = 76.1%
• training time: 150 min

spectrogram + 16 filters + extra steps v2

• 30000 steps (0.001 learning_rate), 6000 steps (0.0001 learning_rate) = total 36000s
• acc = 75.8%

spectrogram + 8 filters + extra steps

• 30000 steps (0.001 learning_rate), 6000 steps (0.0001 learning_rate) = total 36000s
• acc = 71.7%
• training time: 130 min

spectrogram + 8 filters + extra steps v2

• 30000 steps (0.001 learning_rate), 6000 steps (0.0001 learning_rate) = total 36000s
• acc = 72.3%

spectrogram + 4 filters + extra steps

• 30000 steps (0.001 learning_rate), 6000 steps (0.0001 learning_rate) = total 36000s
• acc = 67.3%
• training time: 130 min

spectrogram + 2 filters + extra steps

• 30000 steps (0.001 learning_rate), 6000 steps (0.0001 learning_rate) = total 36000s
• acc = 65.3%
• training time: 125 min