For standard English, the acoustic model can stay the same. Fine tuning of the acoustic model would be needed if you were planning on transcribing atypical words, e.g. names of products or companies etc.
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thank a lot
So I dont have to train the model because i dont need any new words.
I could not find solution for my problem of making LM and Trie
this is my text file:
one
two
three
how
what
could
where
report
maximize
minimize
could you maximize the form
would you minimize the form
I know this will so much asking, Would you test it? (making lm and trie and run deepspeech)
sorry, don’t have time to setup 0.5.0 now
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@dara1400 I don’t have my computer in front of me, so can’t check exactly what worked for me previously, and like @yv001 I have yet to try a custom LM with 0.5.0.
If you could post the commands you’ve used I can try to have a look tomorrow evening (or maybe the weekend, depending on my timing) .
My general principle here is I’m happy to help (within reason!) if you can make the case you’ve put in some efforts with exploration of the forum, source code & done that kind of leg work already.
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ok thanks alot
I ran the kenlm in google colab
I uploaded the code and my text file
whitout --discount_fallback I got this error:
/content/kenlm/lm/builder/adjust_counts.cc:52 in void lm::builder::{anonymous}::StatCollector::CalculateDiscounts(const lm::builder::DiscountConfig&) threw BadDiscountException because `s.n[j] == 0’.
Could not calculate Kneser-Ney discounts for 1-grams with adjusted count 3 because we didn’t observe any 1-grams with adjusted count 2; Is this small or artificial data?
Try deduplicating the input. To override this error for e.g. a class-based model, rerun with --discount_fallback
after adding --discount_fallback the lm.binary and trie generated, but when I use deepspeech it crashes.
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Hi @dara1400 - sorry, didn’t manage to get onto this yesterday evening, but I’ve managed to get it working and attach the LM (zipped up) plus did a quick video to demo it working.
And the good news is that it’s pretty effective with your list of words/phrases.
I’ll list out some details below (you may well know some of this from your experiments, but hopefully it may help others also trying to do this)
I hope this helps - if you still have issues, post the errors you see (in detail ideally), at which point they occur etc etc and we can try to figure it out from there 
Key background:
- is worth refering to here for some basic detail on the LM: https://github.com/mozilla/DeepSpeech/tree/master/data/lm
- do not make mistake of following the KenLM BUILDING instructions in https://github.com/mozilla/DeepSpeech/tree/master/native_client/kenlm (not required)
- you can (+ should) use the official KenLM repo (this doesn’t seem to be covered in requirements, but would be a useful PR)
- these steps are v. similar to what’s shown in here, it’s simply that I’ve tested them with the 0.5.0 model: TUTORIAL : How I trained a specific french model to control my robot
- you’ll need to have downloaded the relevant native client tar file for your environment (for me that was native_client.amd64.cuda.linux.tar.xz) and use generate_trie from there OR build it (this will be more complex and I didn’t go this route for speed)
The aim is to take your input (ie the list of “one”, “two” etc) and produce the two output files lm.binary and trie
input file:
vocabulary.txt – this is the file of phrases that you want your LM to process
output files:
- words.arpa – used to produce the other outputs, not used directly by DeepSpeech
- lm.binary
- trie
Steps
Install and build KenML
See details here or try a pre-build binary for your distro if one exists
Create a working directory
mkdir working
mkdir working/training_material
mkdir working/language_models
Create the file for your phrases
vocabulary.txt - store it in training_material, with each sentence on its own line
From base of KenML folder
build/bin/lmplz --text working/training_material/vocabulary.txt --arpa working/language_models/words.arpa --order 5 --discount_fallback --temp_prefix /tmp/
note: I had previously also played around using –order of 3, 4 and 5 along with –prune 0 0 0 1 (for order 5)
I don’t recall exactly why I’d used prune, but didn’t seem needed here. However like your earlier attempts I did need –discount_fallback (seemingly as the list of phrases is small)
build/bin/build_binary -T -s trie working/language_models/words.arpa working/language_models/lm.binary
Using generate_trie from native_client
See above point about native_client
/path_to_native_client/generate_trie /path_to_deepspeech/DeepSpeech/data/alphabet.txt working/language_models/lm.binary working/language_models/trie
Testing it out
You’ll need to have installed deepspeech for this part onwards
deepspeech --model /path_to_models/deepspeech-0.5.0-models/output_graph.pbmm --alphabet /path_to_models/deepspeech-0.5.0-models/alphabet.txt --lm working/language_models/lm.binary --trie working/language_models/trie --audio /path_to_test_wavs/p225_27280.wav
Gives output like this (note, my test wav file didn’t have many words from the custom LM, but this shows how it clearly is using the LM):
Loading model from file deepspeech-0.5.0-models/output_graph.pbmm TensorFlow: v1.13.1-10-g3e0cc53 DeepSpeech: v0.5.0-alpha.11-0-g1201739 2019-06-15 16:28:50.969519: I tensorflow/core/platform/cpu_feature_guard.cc:141] Your CPU supports instructions that this TensorFlow binary was not compiled to use: AVX2 FMA 2019-06-15 16:28:51.046477: I tensorflow/stream_executor/cuda/cuda_gpu_executor.cc:998] successful NUMA node read from SysFS had negative value (-1), but there must be at least one NUMA node, so returning NUMA node zero 2019-06-15 16:28:51.046944: I tensorflow/core/common_runtime/gpu/gpu_device.cc:1433] Found device 0 with properties: name: GeForce GTX 1080 Ti major: 6 minor: 1 memoryClockRate(GHz): 1.582 pciBusID: 0000:01:00.0 totalMemory: 10.91GiB freeMemory: 10.42GiB 2019-06-15 16:28:51.046955: I tensorflow/core/common_runtime/gpu/gpu_device.cc:1512] Adding visible gpu devices: 0 2019-06-15 16:28:51.457048: I tensorflow/core/common_runtime/gpu/gpu_device.cc:984] Device interconnect StreamExecutor with strength 1 edge matrix: 2019-06-15 16:28:51.457068: I tensorflow/core/common_runtime/gpu/gpu_device.cc:990] 0 2019-06-15 16:28:51.457072: I tensorflow/core/common_runtime/gpu/gpu_device.cc:1003] 0: N 2019-06-15 16:28:51.457141: I tensorflow/core/common_runtime/gpu/gpu_device.cc:1115] Created TensorFlow device (/job:localhost/replica:0/task:0/device:GPU:0 with 10088 MB memory) -> physical GPU (device: 0, name: GeForce GTX 1080 Ti, pci bus id: 0000:01:00.0, compute capability: 6.1) 2019-06-15 16:28:51.460453: E tensorflow/core/framework/op_kernel.cc:1325] OpKernel ('op: "UnwrapDatasetVariant" device_type: "CPU"') for unknown op: UnwrapDatasetVariant 2019-06-15 16:28:51.460467: E tensorflow/core/framework/op_kernel.cc:1325] OpKernel ('op: "WrapDatasetVariant" device_type: "GPU" host_memory_arg: "input_handle" host_memory_arg: "output_handle"') for unknown op: WrapDatasetVariant 2019-06-15 16:28:51.460473: E tensorflow/core/framework/op_kernel.cc:1325] OpKernel ('op: "WrapDatasetVariant" device_type: "CPU"') for unknown op: WrapDatasetVariant 2019-06-15 16:28:51.460598: E tensorflow/core/framework/op_kernel.cc:1325] OpKernel ('op: "UnwrapDatasetVariant" device_type: "GPU" host_memory_arg: "input_handle" host_memory_arg: "output_handle"') for unknown op: UnwrapDatasetVariant Loaded model in 0.493s. Loading language model from files /home/neil/main/Projects/kenlm/working/language_models/lm.binary /home/neil/main/Projects/kenlm/working/language_models/trie Loaded language model in 0.00601s. Warning: original sample rate (22050) is different than 16kHz. Resampling might produce erratic speech recognition. Running inference. 2019-06-15 16:28:51.655464: I tensorflow/stream_executor/dso_loader.cc:152] successfully opened CUDA library libcublas.so.10.0 locally the would the form one how one one the one one Inference took 2.372s for 6.615s audio file.
Trying it out with the Mic VAD Streaming example
python mic_vad_streaming.py -d 7 -m ../../models/deepspeech-0.5.0-models/ -l /path_to_working/working/language_models/lm.binary -t /path_to_working/working/language_models/trie -w wavs/
(this is using the script here)
custom_lm.zip (2.6 KB)
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that was wonderful
thanks a lot
you are wonderful
2 Likes
I have tested my lm and your trie, it works fine
but when I use my trie it crashes, so I think the problem is the generate_trie that I am using.
currently I am using google colab and native_client.amd64.cpu.linux.tar.xz
The windows generate_trie is working well.
I am wondering which native build is fine for google colab
That’s interesting and something of a surprise about the windows generate_trie working. Glad you’ve been able to make progress!
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Hey Neil, thank you so much for providing such detailed steps for customising language model and adding specific sentences.
I used your steps and it worked wonders. Thanks a lot!
Although I am encountering one problem, now I only get output with the vocabulary of those specific sentences that I added and not the whole generic words that original lm.binary file had. Can you please suggest something to solve this…
I created my lm and trie ,
but the deepspeech confuses some of my commands.
maybe be I should mention that i am not a native so i dont have English accent like you.
I attached my vocab, lm and trie
NewLm2.zip (6.1 KB)
I am also not a native.
My point was that my vocab, trie and lm works perfectly fine for all the sentences that I have in my vocab. But when I run this :
deepspeech --model /path_to_models/deepspeech-0.5.0-models/output_graph.pbmm --alphabet /path_to_models/deepspeech-0.5.0-models/alphabet.txt --lm working/language_models/lm.binary --trie working/language_models/trie --audio /path_to_test_wavs/p225_27280.wav
for sentences or words which are not in vocab, output only has the words in vocab so hence not good enough accuracy then. Do you understand what I am trying to say?
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yes
so you can detect what is the voice command.
you dont need to know every word
exactly, so is there a way by which I can combine my created lm.binary and the lm.binary provided by deepspeech in the pretrained model? and also both the tries too
There’s an open issue on the idea of using two language models here: https://github.com/mozilla/DeepSpeech/issues/1678
Until there’s movement on that, if you want both your commands along with more general vocabulary, I think the best approach would be adding additional general sentences - the number added may need some tuning, as presumably the more general ones added the greater the chance the commands get mistaken.
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Hey, Neil.
My language model consists of words that are atypical words like company names, names of products etc.
So , my accuracy suffers because of it. (not very much but some words just give erratic text output)
Can you help me with fine tuning the acoustic model, I dont really need to train the acoustic model as my list of keyword / vocab.txt (created along the lines of your vocab.txt file) with special sentences is not a large file.
Any specific method to fine tune the acoustic model which can help increase the accuracy for the specific sentences?
Thanks in advance, and for being so helpful.
Hi @singhal.harsh2 what have you tried with the acoustic model already?
Do you have audio recordings and in particular with the atypical words you mention? I don’t know for sure what to advise (so take this with a pinch of salt), but I’d suspect that just fine tuning with that kind of audio data in the normal manner (ie as per the README) would help.
Best of luck!
@nmstoker thankyou for the guide. very helpful. I am having one strange behavior though, in inference I get results that are not in my vocabulary.txt at all. I have created the trie, words.arpa and lm.binary and I use those obviously. Does this make sense? I use the pre-trained model 0.5.0
Hi @safas - that does seem odd.
If you’ve closely followed the instructions then it should only return words from your vocabulary file (as per the video where you see it interpret things I say, when talking to the viewer at the end, as the closest fitting words from the vocab only (which are completely not the actual words I’ve said))
I expect you’ve checked carefully already but is it possible that at some stage you’ve either pulled in a different vocabulary file or somehow pointed the script at a different LM, words.arpa file or trie?
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