shucongzhang

CTC-only training recipes for LibriSpeech (code from Samsung AI Cambridge)

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## What does this PR do? This PR provides recipes for training CTC models from scratch (no W2V2, no Whisper). It yields to strong Branchformer-CTC and Conformer-CTC models.

This PR provides necessary code and recipes for reproduce the results of the SummaryMixing SSL paper.

Is24 pr

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1. Added the layernorm flag for SummaryMixing 2. Added the code and yamls for SSL 3. Added the yaml for SB 1.0 Conformer 4. Updated readme

Conformer speechbrain1.0

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This PR includes the yaml and the layernom flag to produce the Conformer results with SpeechBrain 1.0