View Source Bumblebee.Text.Gemma (Bumblebee v0.6.0)

Gemma model family.

Architectures

  • :base - plain Gemma without any head on top

  • :for_causal_language_modeling - Gemma with a language modeling head. The head returns logits for each token in the original sequence

  • :for_sequence_classification - Gemma with a sequence classification head. The head returns logits corresponding to possible classes

Inputs

  • "input_ids" - {batch_size, sequence_length}

    Indices of input sequence tokens in the vocabulary.

  • "attention_mask" - {batch_size, sequence_length}

    Mask indicating which tokens to attend to. This is used to ignore padding tokens, which are added when processing a batch of sequences with different length.

  • "position_ids" - {batch_size, sequence_length}

    Indices of positions of each input sequence tokens in the position embeddings.

  • "attention_head_mask" - {encoder_num_blocks, encoder_num_attention_heads}

    Mask to nullify selected heads of the self-attention blocks in the encoder.

  • "input_embeddings" - {batch_size, sequence_length, hidden_size}

    Embedded representation of "input_ids", which can be specified for more control over how "input_ids" are embedded than the model's internal embedding lookup. If "input_embeddings" are present, then "input_ids" will be ignored.

  • "cache"

    A container with cached layer results used to speed up sequential decoding (autoregression). With cache, certain hidden states are taken from the cache, rather than recomputed on every decoding pass. The cache should be treated as opaque and initialized with Bumblebee.Text.Generation.init_cache/4.

Global layer options

  • :output_hidden_states - when true, the model output includes all hidden states

  • :output_attentions - when true, the model output includes all attention weights

Configuration

  • :vocab_size - the vocabulary size of the token embedding. This corresponds to the number of distinct tokens that can be represented in model input and output . Defaults to 256000

  • :max_positions - the vocabulary size of the position embedding. This corresponds to the maximum sequence length that this model can process. Typically this is set to a large value just in case, such as 512, 1024 or 2048 . Defaults to 8192

  • :hidden_size - the dimensionality of hidden layers. Defaults to 3072

  • :intermediate_size - the dimensionality of intermediate layers. Defaults to 24576

  • :attention_head_size - the size of the key, value, and query projection per attention head. Defaults to 256

  • :num_blocks - the number of Transformer blocks in the model. Defaults to 28

  • :num_attention_heads - the number of attention heads for each attention layer in the model. Defaults to 16

  • :num_key_value_heads - the number of key value heads for each attention layer in the model. Defaults to 16

  • :activation - the activation function. Defaults to :gelu_approx_tanh

  • :rotary_embedding_base - base for computing rotary embedding frequency. Defaults to 10000

  • :rotary_embedding_scaling_strategy - scaling configuration for rotary embedding. Currently the supported values are:

    • %{type: :linear, factor: number()}

    • %{type: :dynamic, factor: number()}

    For more details see https://www.reddit.com/r/LocalLlama/comments/14mrgpr/dynamically_scaled_rope_further_increases

  • :use_attention_bias - whether or not to use bias in the query, key, value, and output projections in attention layers. Defaults to false

  • :layer_norm_epsilon - the epsilon used by RMS normalization layers. Defaults to 1.0e-6

  • :initializer_scale - the standard deviation of the normal initializer used for initializing kernel parameters. Defaults to 0.02

  • :num_labels - the number of labels to use in the last layer for the classification task. Defaults to 2

  • :id_to_label - a map from class index to label. Defaults to %{}