kerasformers/gemma-3-4b-pt

See our collection for all Gemma 3 sizes and variants.

Run Gemma 3 with Keras 3: JAX, PyTorch, or TensorFlow

kerasformers/gemma-3-4b-pt

Pure-Keras 3 conversion of google/gemma-3-4b-pt for kerasformers. One implementation runs unmodified on TensorFlow / Torch / JAX. This is a base (pretrained) checkpoint, served here as image + text -> text via Gemma3ConditionalGenerate; weights are stored in bfloat16.

For model details, license, and usage terms, see Google's model card.

✨ Quick start

Text-only

import os
os.environ["KERAS_BACKEND"] = "torch"  # or "jax" / "tensorflow"

from kerasformers.models.gemma3 import Gemma3TextGenerate, Gemma3Tokenizer

model = Gemma3TextGenerate.from_weights("kerasformers/gemma-3-4b-pt")
tokenizer = Gemma3Tokenizer.from_weights("kerasformers/gemma-3-4b-pt")

inputs = tokenizer([{"role": "user", "content": "Hello, who are you?"}])
outputs = model.generate(**inputs, max_new_tokens=64)
print(tokenizer.decode(outputs[0]))

Image + text

from kerasformers.models.gemma3 import Gemma3ConditionalGenerate, Gemma3Processor

model = Gemma3ConditionalGenerate.from_weights("kerasformers/gemma-3-4b-pt")
processor = Gemma3Processor.from_weights("kerasformers/gemma-3-4b-pt")

conversation = [
    {"role": "user", "content": [
        {"type": "image", "url": "https://.../image.jpg"},
        {"type": "text", "text": "Describe this image."},
    ]},
]
inputs = processor(conversation)
outputs = model.generate(**inputs, max_new_tokens=64)
print(processor.decode(outputs[0]))

Load any Gemma 3 variant the same way with from_weights("kerasformers/<variant>"):

Variant	Hub
gemma-3-12b-it	kerasformers/gemma-3-12b-it
gemma-3-12b-pt	kerasformers/gemma-3-12b-pt
gemma-3-1b-it	kerasformers/gemma-3-1b-it
gemma-3-1b-pt	kerasformers/gemma-3-1b-pt
gemma-3-270m	kerasformers/gemma-3-270m
gemma-3-270m-it	kerasformers/gemma-3-270m-it
gemma-3-27b-it	kerasformers/gemma-3-27b-it
gemma-3-27b-pt	kerasformers/gemma-3-27b-pt
gemma-3-4b-it	kerasformers/gemma-3-4b-it
gemma-3-4b-pt	kerasformers/gemma-3-4b-pt

Tips

• Set KERAS_BACKEND before importing Keras / kerasformers.
• Loads in bfloat16 by default. Pass load_dtype="float32" for full precision, or quantization="int8" to shrink further.
• See the Gemma 3 docs.
• Community / upstream weights still work via the hf: prefix: Gemma3ConditionalGenerate.from_weights("hf:google/gemma-3-4b-pt").

Special Thanks

A huge thank you to the Google Gemma authors for creating and releasing these models.

License: Gemma (gated). Accept the license on the upstream Hub card before downloading.