Fix operators in colab demo

examples/pysr_demo.ipynb

@@ -231,7 +231,7 @@
     "# Learn equations\n",
     "model = PySRRegressor(\n",
     "    niterations=30,\n",
-    "    binary_operators=[\"+\", \"-\"],\n",
+    "    binary_operators=[\"+\", \"*\"],\n",
     "    unary_operators=[\"cos\", \"exp\", \"sin\"],\n",
     "    **default_pysr_params\n",
     ")\n",
@@ -439,7 +439,7 @@
     "model = PySRRegressor(\n",
     "    niterations=5,\n",
     "    populations=40,\n",
-    "    binary_operators=[\"+\", \"-\"],\n",
+    "    binary_operators=[\"+\", \"*\"],\n",
     "    unary_operators=[\"cos\", \"exp\", \"sin\", \"quart(x) = x^4\"],\n",
     "    extra_sympy_mappings={\"quart\": lambda x: x**4},\n",
     ")\n",
@@ -651,7 +651,7 @@
     "    loss=\"myloss(x, y, w) = w * abs(x - y)\",  # Custom loss function with weights.\n",
     "    niterations=20,\n",
     "    populations=20,  # Use more populations\n",
-    "    binary_operators=[\"+\", \"-\"],\n",
+    "    binary_operators=[\"+\", \"*\"],\n",
     "    unary_operators=[\"cos\"],\n",
     ")\n",
     "model.fit(X, y, weights=weights)"
@@ -833,7 +833,7 @@
     "import pysr\n",
     "\n",
     "jl = pysr.julia_helpers.init_julia(\n",
-    "    julia_kwargs=dict(optimize=3, threads=\"auto\", compiled_modules=\"False\")\n",
+    "    julia_kwargs=dict(optimize=3, threads=\"auto\", compiled_modules=False)\n",
     ")"
    ]
   },