feat: stream pip output live to UI logs during unsloth install

training/space_runner.py

@@ -55,21 +55,31 @@ def _run_training():
     _pip_base = [sys.executable, "-m", "pip", "install", "--no-cache-dir", "--target", _PKGS]
 
     install_cmds = [
-        _pip_base + ["unsloth"],
-        _pip_base + [f"unsloth[cu121-ampere-{torch_tag}] @ git+https://github.com/unslothai/unsloth.git"],
-        _pip_base + ["git+https://github.com/unslothai/unsloth.git"],
+        _pip_base + ["--progress-bar", "on", "unsloth"],
+        _pip_base + ["--progress-bar", "on",
+                     f"unsloth[cu121-ampere-{torch_tag}] @ git+https://github.com/unslothai/unsloth.git"],
+        _pip_base + ["--progress-bar", "on", "git+https://github.com/unslothai/unsloth.git"],
     ]
     installed = False
     for cmd in install_cmds:
-        result = subprocess.run(cmd, capture_output=True, text=True)
-        if result.returncode == 0:
+        proc = subprocess.Popen(
+            cmd, stdout=subprocess.PIPE, stderr=subprocess.STDOUT,
+            text=True, bufsize=1,
+        )
+        lines = []
+        for line in proc.stdout:
+            line = line.rstrip()
+            if line:
+                _append_log(line)
+                lines.append(line)
+        proc.wait()
+        if proc.returncode == 0:
             if _PKGS not in sys.path:
                 sys.path.insert(0, _PKGS)
-            _append_log("unsloth installed successfully.")
+            _append_log("✅ unsloth installed successfully.")
             installed = True
             break
-        err = (result.stderr or result.stdout or "")[-600:].strip()
-        _append_log(f"Install attempt failed:\n{err}")
+        _append_log(f"⚠️ Install attempt failed (exit {proc.returncode}), trying next...")
     if not installed:
         _training_status = "failed"
         _append_log("❌ All unsloth install attempts failed. Check logs above.")