Move gemma4 script (#4994)

* updating gemma4 script

* moving gemma4 script to scripts folder

scripts/install_gemma4_mlx.sh

@@ -0,0 +1,169 @@
+#!/bin/bash
+set -e
+
+# ============================================================
+# Gemma 4 MLX — One-command setup + inference
+#
+# Usage:
+#   bash install_gemma4_mlx.sh [--venv-dir DIR]
+#
+# This script:
+#   1. Creates a Python virtual environment
+#   2. Installs uv, mlx-vlm, transformers
+# ============================================================
+
+# ── Output style (inspired by unsloth/install.sh) ─────────────
+RULE=""
+_rule_i=0
+while [ "$_rule_i" -lt 52 ]; do
+    RULE="${RULE}─"
+    _rule_i=$((_rule_i + 1))
+done
+
+if [ -n "${NO_COLOR:-}" ]; then
+    C_TITLE= C_DIM= C_OK= C_WARN= C_ERR= C_RST=
+elif [ -t 1 ] || [ -n "${FORCE_COLOR:-}" ]; then
+    _ESC="$(printf '\033')"
+    C_TITLE="${_ESC}[38;5;117m"
+    C_DIM="${_ESC}[38;5;245m"
+    C_OK="${_ESC}[38;5;108m"
+    C_WARN="${_ESC}[38;5;136m"
+    C_ERR="${_ESC}[91m"
+    C_RST="${_ESC}[0m"
+else
+    C_TITLE= C_DIM= C_OK= C_WARN= C_ERR= C_RST=
+fi
+
+step()    { printf "  ${C_DIM}%-18.18s${C_RST}${3:-$C_OK}%s${C_RST}\n" "$1" "$2"; }
+substep() { printf "  ${C_DIM}%-18s${2:-$C_DIM}%s${C_RST}\n" "" "$1"; }
+fail()    { step "error" "$1" "$C_ERR"; exit 1; }
+
+# ── Parse flags ───────────────────────────────────────────────
+VENV_DIR=""
+_next_is_venv=false
+
+for arg in "$@"; do
+    if [ "$_next_is_venv" = true ]; then
+        VENV_DIR="$arg"
+        _next_is_venv=false
+        continue
+    fi
+    case "$arg" in
+        --venv-dir)  _next_is_venv=true ;;
+    esac
+done
+
+# Default venv location
+if [ -z "$VENV_DIR" ]; then
+    VENV_DIR="$HOME/.unsloth/unsloth_gemma4_mlx"
+fi
+
+# ── Banner ────────────────────────────────────────────────────
+echo ""
+printf "  ${C_TITLE}%s${C_RST}\n" "💎 Gemma 4 MLX Installer"
+printf "  ${C_DIM}%s${C_RST}\n" "$RULE"
+echo ""
+
+# ── Platform check ────────────────────────────────────────────
+if [ "$(uname)" != "Darwin" ]; then
+    fail "MLX requires macOS with Apple Silicon. Detected: $(uname)"
+fi
+
+_ARCH=$(uname -m)
+if [ "$_ARCH" != "arm64" ]; then
+    step "warning" "Apple Silicon recommended (detected: $_ARCH)" "$C_WARN"
+fi
+
+step "platform" "macOS ($_ARCH)"
+
+# ── Detect Python ─────────────────────────────────────────────
+PYTHON=""
+for _candidate in python3.12 python3.11 python3.13 python3; do
+    if command -v "$_candidate" >/dev/null 2>&1; then
+        PYTHON="$_candidate"
+        break
+    fi
+done
+
+if [ -z "$PYTHON" ]; then
+    fail "Python 3 not found. Install via: brew install python@3.12"
+fi
+
+_PY_VERSION=$("$PYTHON" -c "import sys; print(f'{sys.version_info.major}.{sys.version_info.minor}.{sys.version_info.micro}')")
+step "python" "$PYTHON ($_PY_VERSION)"
+
+# ── Create virtual environment ────────────────────────────────
+if [ -x "$VENV_DIR/bin/python" ]; then
+    step "venv" "using existing environment"
+    substep "$VENV_DIR"
+else
+    step "venv" "creating virtual environment"
+    substep "$VENV_DIR"
+    mkdir -p "$(dirname "$VENV_DIR")"
+    "$PYTHON" -m venv "$VENV_DIR"
+fi
+
+# ── Install uv ───────────────────────────────────────────────
+if ! command -v uv >/dev/null 2>&1; then
+    step "uv" "installing uv package manager..."
+    _uv_tmp=$(mktemp)
+    curl -LsSf "https://astral.sh/uv/install.sh" -o "$_uv_tmp"
+    sh "$_uv_tmp" </dev/null >/dev/null 2>&1
+    rm -f "$_uv_tmp"
+    if [ -f "$HOME/.local/bin/env" ]; then
+        . "$HOME/.local/bin/env"
+    fi
+    export PATH="$HOME/.local/bin:$PATH"
+    substep "done"
+else
+    step "uv" "found $(uv --version 2>/dev/null || echo 'uv')"
+fi
+
+_VENV_PY="$VENV_DIR/bin/python"
+
+# ── Install dependencies ──────────────────────────────────────
+step "install" "installing mlx-vlm..."
+uv pip install --python "$_VENV_PY" -q mlx-vlm
+substep "done"
+
+step "install" "installing transformers>=5.5.0..."
+if uv pip install --python "$_VENV_PY" -q "transformers>=5.5.0" 2>/dev/null; then
+    substep "installed from PyPI"
+else
+    substep "PyPI install failed (Python <3.10?), trying GitHub..."
+    if uv pip install --python "$_VENV_PY" -q "git+https://github.com/huggingface/transformers.git@v5.5-release" 2>/dev/null; then
+        substep "installed from huggingface/transformers v5.5-release"
+    else
+        step "warning" "could not install transformers>=5.5.0" "$C_WARN"
+        substep "tried: PyPI, huggingface/transformers v5.5-release"
+    fi
+fi
+
+# ── Verify installation ──────────────────────────────────────
+if "$_VENV_PY" -c "import mlx_vlm"; then
+    substep "mlx-vlm verified"
+else
+    fail "Installation verification failed."
+fi
+
+# ── Done ──────────────────────────────────────────────────────
+echo ""
+printf "  ${C_TITLE}%s${C_RST}\n" "Gemma 4 MLX installed!"
+printf "  ${C_DIM}%s${C_RST}\n" "$RULE"
+echo ""
+step "available models" "unsloth/gemma-4-E2B-it-UD-MLX-4bit"
+substep "unsloth/gemma-4-E4B-it-UD-MLX-4bit"
+substep "unsloth/gemma-4-26b-a4b-it-UD-MLX-4bit"
+substep "unsloth/gemma-4-31b-it-UD-MLX-4bit"
+echo ""
+step "venv activate" "source ${VENV_DIR}/bin/activate"
+echo ""
+step "text chat" "python -m mlx_vlm.chat --model unsloth/gemma-4-E2B-it-UD-MLX-4bit"
+echo ""
+step "vision chat" "python -m mlx_vlm.chat --model unsloth/gemma-4-31b-it-UD-MLX-4bit"
+substep "Use /image path/to/image.jpg to load an image"
+echo ""
+step "gradio UI" "python -m mlx_vlm.chat_ui --model unsloth/gemma-4-31b-it-UD-MLX-4bit"
+echo ""
+printf "  ${C_DIM}%s${C_RST}\n" "$RULE"
+echo ""