LF-MMI
No estimate
No hardware requirements for this model
The weights for this model have not been published, so it cannot be downloaded or run on your own hardware at any size. It is reachable only through its provider, and no graphics card changes that.
On record
Full specification
Everything on record for this model. Most of it describes how it was trained rather than how it runs — useful context for judging how much work went into it, and how it compares with models built at a different scale.
Origin
Who built this model, where, and when it was published.
- Organisation
- Johns Hopkins University,Cornell University
- Organisation type
- Academia,Academia
- Country
- United States of America
- Published
- 8 September 2016
- Authors
- Daniel Povey, Vijayaditya Peddinti, Daniel Galvez, Pegah Ghahremani, Vimal Manohar, Xingyu Na, Yiming Wang, S. Khudanpur
What it does
The problem areas the model was built for. A model can carry several of each.
- Domain
- Speech
- Task
- Speech recognition (ASR)
Size
How large the model is and how much data it was trained on. Parameters are the figure that decides whether it fits on a given graphics card.
- Parameters
- 16.6M
- Training data
- 720,000 tokens
Largest model: TDNN-A: 16.6 million parameters (Table 2)
300hr of audio, number of words unclear
Availability
Whether you can obtain the model and run it on your own hardware, which is what decides if any of the graphics-card figures on this page apply.
- Weights
- Closed — provider access only
- Model access
- Unreleased
How it is classified
Labels the source dataset applies when tracking notable models, and how confident it is in the entry.
- Why it is tracked
- Highly cited,SOTA improvement
- Record confidence
- Confident
SOTA on Speech Recognition on WSJ eval92
Sources
Where this record came from and when it was last checked.
- Reference
- Purely sequence-trained neural networks for ASR based on lattice-free MMI
- Last updated
- 28 November 2025
What the numbers mean
What this model is
LF-MMI was published by Johns Hopkins University,Cornell University, in the country recorded as United States of America, during September 2016. The publishing organisation is categorised as academia,Academia.
It works in the domain of Speech, and is recorded as performing the task of speech recognition (ASR).
Because the weights are not available, none of the hardware figures elsewhere on this site apply to it.
What went into building it
The training set ran to roughly 720,000 tokens of text.
The reason it appears in this catalogue at all: highly cited,SOTA improvement.
Answers
LF-MMI — common questions
LF-MMI— what is it used for?
It works in the domain of Speech, and is recorded as handling the task of speech recognition (ASR). A model can carry several of each, so these are the areas it was built for rather than a limit on what it will attempt.
LF-MMI— what GPU do I need to run it?
None. This is a closed model — its weights were never published, so it cannot be downloaded or run on your own hardware at any price. It is reachable only through its provider.
LF-MMI— is it open source?
No. Its weights have not been published, so it exists only as a service controlled by its owner.
LF-MMI— how many parameters does it have?
It has a parameter count of 16.6M. Largest model: TDNN-A: 16.6 million parameters (Table 2). That figure is the total, and it is what decides how much memory the model needs — roughly half a gigabyte per billion at the compression most people use.
LF-MMI— who created it?
It was published by Johns Hopkins University,Cornell University, based in United States of America, an organisation categorised as academia,Academia.
LF-MMI— when was it released?
It was published in September 2016. Capability per parameter has improved considerably since, so a newer model of the same size is often the better use of the same hardware.
The other direction
Looking at it from the other side?
This page starts from the model. If you already own a card and want to know everything it will run, start from the hardware instead.